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How to Write a Thesis Statement | 4 Steps & Examples

Published on January 11, 2019 by Shona McCombes . Revised on August 15, 2023 by Eoghan Ryan.

A thesis statement is a sentence that sums up the central point of your paper or essay . It usually comes near the end of your introduction .

Your thesis will look a bit different depending on the type of essay you’re writing. But the thesis statement should always clearly state the main idea you want to get across. Everything else in your essay should relate back to this idea.

You can write your thesis statement by following four simple steps:

• Start with a question
• Write your initial answer
• Develop your answer
• Refine your thesis statement

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Table of contents

What is a thesis statement, placement of the thesis statement, step 1: start with a question, step 2: write your initial answer, step 3: develop your answer, step 4: refine your thesis statement, types of thesis statements, other interesting articles, frequently asked questions about thesis statements.

A thesis statement summarizes the central points of your essay. It is a signpost telling the reader what the essay will argue and why.

The best thesis statements are:

• Concise: A good thesis statement is short and sweet—don’t use more words than necessary. State your point clearly and directly in one or two sentences.
• Contentious: Your thesis shouldn’t be a simple statement of fact that everyone already knows. A good thesis statement is a claim that requires further evidence or analysis to back it up.
• Coherent: Everything mentioned in your thesis statement must be supported and explained in the rest of your paper.

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The thesis statement generally appears at the end of your essay introduction or research paper introduction .

The spread of the internet has had a world-changing effect, not least on the world of education. The use of the internet in academic contexts and among young people more generally is hotly debated. For many who did not grow up with this technology, its effects seem alarming and potentially harmful. This concern, while understandable, is misguided. The negatives of internet use are outweighed by its many benefits for education: the internet facilitates easier access to information, exposure to different perspectives, and a flexible learning environment for both students and teachers.

You should come up with an initial thesis, sometimes called a working thesis , early in the writing process . As soon as you’ve decided on your essay topic , you need to work out what you want to say about it—a clear thesis will give your essay direction and structure.

You might already have a question in your assignment, but if not, try to come up with your own. What would you like to find out or decide about your topic?

For example, you might ask:

After some initial research, you can formulate a tentative answer to this question. At this stage it can be simple, and it should guide the research process and writing process .

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Now you need to consider why this is your answer and how you will convince your reader to agree with you. As you read more about your topic and begin writing, your answer should get more detailed.

In your essay about the internet and education, the thesis states your position and sketches out the key arguments you’ll use to support it.

The negatives of internet use are outweighed by its many benefits for education because it facilitates easier access to information.

In your essay about braille, the thesis statement summarizes the key historical development that you’ll explain.

The invention of braille in the 19th century transformed the lives of blind people, allowing them to participate more actively in public life.

A strong thesis statement should tell the reader:

• Why you hold this position
• What they’ll learn from your essay
• The key points of your argument or narrative

The final thesis statement doesn’t just state your position, but summarizes your overall argument or the entire topic you’re going to explain. To strengthen a weak thesis statement, it can help to consider the broader context of your topic.

These examples are more specific and show that you’ll explore your topic in depth.

Your thesis statement should match the goals of your essay, which vary depending on the type of essay you’re writing:

• In an argumentative essay , your thesis statement should take a strong position. Your aim in the essay is to convince your reader of this thesis based on evidence and logical reasoning.
• In an expository essay , you’ll aim to explain the facts of a topic or process. Your thesis statement doesn’t have to include a strong opinion in this case, but it should clearly state the central point you want to make, and mention the key elements you’ll explain.

If you want to know more about AI tools , college essays , or fallacies make sure to check out some of our other articles with explanations and examples or go directly to our tools!

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A thesis statement is a sentence that sums up the central point of your paper or essay . Everything else you write should relate to this key idea.

The thesis statement is essential in any academic essay or research paper for two main reasons:

• It gives your writing direction and focus.
• It gives the reader a concise summary of your main point.

Without a clear thesis statement, an essay can end up rambling and unfocused, leaving your reader unsure of exactly what you want to say.

Follow these four steps to come up with a thesis statement :

• Ask a question about your topic .
• Write your initial answer.
• Develop your answer by including reasons.
• Refine your answer, adding more detail and nuance.

The thesis statement should be placed at the end of your essay introduction .

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Thesis Statements

What this handout is about.

This handout describes what a thesis statement is, how thesis statements work in your writing, and how you can craft or refine one for your draft.

Introduction

Writing in college often takes the form of persuasion—convincing others that you have an interesting, logical point of view on the subject you are studying. Persuasion is a skill you practice regularly in your daily life. You persuade your roommate to clean up, your parents to let you borrow the car, your friend to vote for your favorite candidate or policy. In college, course assignments often ask you to make a persuasive case in writing. You are asked to convince your reader of your point of view. This form of persuasion, often called academic argument, follows a predictable pattern in writing. After a brief introduction of your topic, you state your point of view on the topic directly and often in one sentence. This sentence is the thesis statement, and it serves as a summary of the argument you’ll make in the rest of your paper.

What is a thesis statement?

A thesis statement:

• tells the reader how you will interpret the significance of the subject matter under discussion.
• is a road map for the paper; in other words, it tells the reader what to expect from the rest of the paper.
• directly answers the question asked of you. A thesis is an interpretation of a question or subject, not the subject itself. The subject, or topic, of an essay might be World War II or Moby Dick; a thesis must then offer a way to understand the war or the novel.
• makes a claim that others might dispute.
• is usually a single sentence near the beginning of your paper (most often, at the end of the first paragraph) that presents your argument to the reader. The rest of the paper, the body of the essay, gathers and organizes evidence that will persuade the reader of the logic of your interpretation.

If your assignment asks you to take a position or develop a claim about a subject, you may need to convey that position or claim in a thesis statement near the beginning of your draft. The assignment may not explicitly state that you need a thesis statement because your instructor may assume you will include one. When in doubt, ask your instructor if the assignment requires a thesis statement. When an assignment asks you to analyze, to interpret, to compare and contrast, to demonstrate cause and effect, or to take a stand on an issue, it is likely that you are being asked to develop a thesis and to support it persuasively. (Check out our handout on understanding assignments for more information.)

How do I create a thesis?

A thesis is the result of a lengthy thinking process. Formulating a thesis is not the first thing you do after reading an essay assignment. Before you develop an argument on any topic, you have to collect and organize evidence, look for possible relationships between known facts (such as surprising contrasts or similarities), and think about the significance of these relationships. Once you do this thinking, you will probably have a “working thesis” that presents a basic or main idea and an argument that you think you can support with evidence. Both the argument and your thesis are likely to need adjustment along the way.

Writers use all kinds of techniques to stimulate their thinking and to help them clarify relationships or comprehend the broader significance of a topic and arrive at a thesis statement. For more ideas on how to get started, see our handout on brainstorming .

How do I know if my thesis is strong?

If there’s time, run it by your instructor or make an appointment at the Writing Center to get some feedback. Even if you do not have time to get advice elsewhere, you can do some thesis evaluation of your own. When reviewing your first draft and its working thesis, ask yourself the following :

• Do I answer the question? Re-reading the question prompt after constructing a working thesis can help you fix an argument that misses the focus of the question. If the prompt isn’t phrased as a question, try to rephrase it. For example, “Discuss the effect of X on Y” can be rephrased as “What is the effect of X on Y?”
• Have I taken a position that others might challenge or oppose? If your thesis simply states facts that no one would, or even could, disagree with, it’s possible that you are simply providing a summary, rather than making an argument.
• Is my thesis statement specific enough? Thesis statements that are too vague often do not have a strong argument. If your thesis contains words like “good” or “successful,” see if you could be more specific: why is something “good”; what specifically makes something “successful”?
• Does my thesis pass the “So what?” test? If a reader’s first response is likely to  be “So what?” then you need to clarify, to forge a relationship, or to connect to a larger issue.
• Does my essay support my thesis specifically and without wandering? If your thesis and the body of your essay do not seem to go together, one of them has to change. It’s okay to change your working thesis to reflect things you have figured out in the course of writing your paper. Remember, always reassess and revise your writing as necessary.
• Does my thesis pass the “how and why?” test? If a reader’s first response is “how?” or “why?” your thesis may be too open-ended and lack guidance for the reader. See what you can add to give the reader a better take on your position right from the beginning.

Suppose you are taking a course on contemporary communication, and the instructor hands out the following essay assignment: “Discuss the impact of social media on public awareness.” Looking back at your notes, you might start with this working thesis:

Social media impacts public awareness in both positive and negative ways.

You can use the questions above to help you revise this general statement into a stronger thesis.

• Do I answer the question? You can analyze this if you rephrase “discuss the impact” as “what is the impact?” This way, you can see that you’ve answered the question only very generally with the vague “positive and negative ways.”
• Have I taken a position that others might challenge or oppose? Not likely. Only people who maintain that social media has a solely positive or solely negative impact could disagree.
• Is my thesis statement specific enough? No. What are the positive effects? What are the negative effects?
• Does my thesis pass the “how and why?” test? No. Why are they positive? How are they positive? What are their causes? Why are they negative? How are they negative? What are their causes?
• Does my thesis pass the “So what?” test? No. Why should anyone care about the positive and/or negative impact of social media?

After thinking about your answers to these questions, you decide to focus on the one impact you feel strongly about and have strong evidence for:

Because not every voice on social media is reliable, people have become much more critical consumers of information, and thus, more informed voters.

This version is a much stronger thesis! It answers the question, takes a specific position that others can challenge, and it gives a sense of why it matters.

Let’s try another. Suppose your literature professor hands out the following assignment in a class on the American novel: Write an analysis of some aspect of Mark Twain’s novel Huckleberry Finn. “This will be easy,” you think. “I loved Huckleberry Finn!” You grab a pad of paper and write:

Mark Twain’s Huckleberry Finn is a great American novel.

You begin to analyze your thesis:

• Do I answer the question? No. The prompt asks you to analyze some aspect of the novel. Your working thesis is a statement of general appreciation for the entire novel.

Think about aspects of the novel that are important to its structure or meaning—for example, the role of storytelling, the contrasting scenes between the shore and the river, or the relationships between adults and children. Now you write:

In Huckleberry Finn, Mark Twain develops a contrast between life on the river and life on the shore.

• Do I answer the question? Yes!
• Have I taken a position that others might challenge or oppose? Not really. This contrast is well-known and accepted.
• Is my thesis statement specific enough? It’s getting there–you have highlighted an important aspect of the novel for investigation. However, it’s still not clear what your analysis will reveal.
• Does my thesis pass the “how and why?” test? Not yet. Compare scenes from the book and see what you discover. Free write, make lists, jot down Huck’s actions and reactions and anything else that seems interesting.
• Does my thesis pass the “So what?” test? What’s the point of this contrast? What does it signify?”

After examining the evidence and considering your own insights, you write:

Through its contrasting river and shore scenes, Twain’s Huckleberry Finn suggests that to find the true expression of American democratic ideals, one must leave “civilized” society and go back to nature.

This final thesis statement presents an interpretation of a literary work based on an analysis of its content. Of course, for the essay itself to be successful, you must now present evidence from the novel that will convince the reader of your interpretation.

Works consulted

We consulted these works while writing this handout. This is not a comprehensive list of resources on the handout’s topic, and we encourage you to do your own research to find additional publications. Please do not use this list as a model for the format of your own reference list, as it may not match the citation style you are using. For guidance on formatting citations, please see the UNC Libraries citation tutorial . We revise these tips periodically and welcome feedback.

Anson, Chris M., and Robert A. Schwegler. 2010. The Longman Handbook for Writers and Readers , 6th ed. New York: Longman.

Lunsford, Andrea A. 2015. The St. Martin’s Handbook , 8th ed. Boston: Bedford/St Martin’s.

Ramage, John D., John C. Bean, and June Johnson. 2018. The Allyn & Bacon Guide to Writing , 8th ed. New York: Pearson.

Ruszkiewicz, John J., Christy Friend, Daniel Seward, and Maxine Hairston. 2010. The Scott, Foresman Handbook for Writers , 9th ed. Boston: Pearson Education.

You may reproduce it for non-commercial use if you use the entire handout and attribute the source: The Writing Center, University of North Carolina at Chapel Hill

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Writing an Effective Thesis Statement

Writing an Effective Thesis Statement Podcast

Writing an effective thesis statement transcript.

Greetings everyone. This is Kurtis Clements with another effective writing podcast. In this episode, I am going to discuss how to write an effective thesis statement. One issue to keep in mind when you write is that your words need to stand on their own. It is your responsibility to express your thoughts in a way that others can understand. Think of it this way: You will not be around to explain to readers what you meant by a certain remark or to offer another example to illustrate a fuzzy point. Indeed, the words in your composition will have to communicate meaning without your presence. What you do not want to have happen is for your audience to reach the end of a piece of your written communication and say, “So what? What’s the point?”

The “so what” of a piece of writing is the specific point the piece makes, what the writing says about its subject. The “so what” is what the writing adds up to. It is the meaning found in the writing. The “so what” of an informative essay may be Boston has a lot to offer young children. The “so what” of a business memo may be profits have exceeded expectations.

No matter the type of composition, the piece of writing must communicate meaning, not to the writer, but, rather, to an audience. The meaning found in a piece of writing, the “so what,” is the most important aspect of any piece of writing, for what good would a piece of writing be if it did not add up to something, if it did not say something to an audience? When you are working on a composition, you will need to think about what you are trying to say so that you are in a position to make sure that what you are trying to communicate is, in fact, communicated.

I know what you’re thinking: What’s all this have to do with a thesis statement? The answer: everything! Let me explain.

Every composition needs to make a clear point about its topic—otherwise, what purpose would the writing serve? One way to ensure that readers will follow along in the development of an essay is by including a written out thesis statement (more on this in just a moment). The word thesis comes from a Greek word that means “proposition” or “position.” In an essay, the thesis establishes the writer’s position, the main idea of the paper, what the writer claims to be true or important about the topic. A thesis helps readers understand the direction the essay is heading and it connects body paragraphs to a controlling idea so that the essay comes together as a unified whole.

Most thesis statements are expressed in a single declarative sentence, but depending on a number of factors such as the scope and complexity of the topic or the writer’s approach in discussing it, the thesis may require more than one sentence, but this is the exception rather than the rule. In most academic writing, the thesis will appear near or at the end of the introduction and announce to readers exactly what the body paragraphs that follow will discuss. In some writing, especially personal writing, a written-out thesis may not be necessary, but regardless the focus of the paper still needs to be clear. So, whether the thesis is written out verbatim or not, the thesis of the paper—what it will discuss—still needs to be clear.

Constructing a thesis statement will take time; in fact, like writing itself, developing a thesis is a process, so you will need to be patient and be willing to revise as necessary. A good thesis comes about the more you explore your topic whether that exploration is the result of exploratory writing like freewriting or research or long walks in which you think and think and think.

As you explore your thinking, your ideas will get clearer and clearer. Again, a thesis statement evolves over time. Begin with a working thesis—your tentative ideas about a topic—and be willing to modify the statement depending on what you discover about your topic and how your thinking changes over time. Indeed, many writers find themselves in jams because they are unwilling to deviate from their original thesis and are bent on trying to support ideas that are unrealistic, perhaps even impossible.

Still worse, some writers try to force the content to fit the idea expressed in the thesis. This won’t work. In fact, some writers approach their work so that the thesis emerges out of the writing. That’s right! Some writers don’t start with a thesis—working or otherwise—and, instead, explore their thinking in writing as a way to discover what it is they have to say about a topic. The fabulous Donald Murray, a journalist and famous writer about the process of writing, worked this way. And other writers work this way, too. And of course, many writers do not work this way and the truth is the actual process you use to develop a thesis does not matter so long as the end result is successful.

As you approach drafting a thesis, make sure you keep your purpose for writing in mind. Will you be informing? Persuading? Entertaining? Complaining? Whatever the case, you will want that purpose to be apparent from the construction of the thesis.

One good way to come up with ideas that you can use to construct a working thesis is to explore your thoughts. What do you already know about the topic? Use freewriting (or some other exploratory writing method such as brainstorming) to capture what you already know and think about the topic. Roll up your sleeves and spend 10, 15, or more minutes just writing. Write about what interests you about the topic and what you might like to know. Explore freely what is bouncing around inside your head and do not be afraid to follow your thinking wherever it takes you. Writing is an act of discovery, and you might stumble upon an interesting angle to pursue if you give yourself permission to explore. After you’ve written for a period of time, look over your writing and see if any dominant idea emerges or if some of the writing suggests a direction worth thinking about more. In a perfect world, the freewriting will produce enough of your ideas that you can almost see the beginning of a thesis.

Another good approach to producing a thesis is to conduct some research. Some assignments may not benefit from this tip, but many—even those that don’t specifically require research—will. To this end, peruse the library whether you do so physically or virtually. Poke and read around about your topic, following the discussion here and there depending on what interests you. Take some notes as you see fit.

You could also ask questions about what you wonder or would like to know about your topic. Do big-box stores such as Home Depot and Wal-Mart have an impact on local economies? What are the benefits of a vegan lifestyle? How costly are green energy sources? What steps should individuals take to safeguard against identity fraud? Avoid yes/no type questions and research accordingly. A good research question can lend itself to the development of a working thesis in that the “answer” can serve as a starting point.

So what are the characteristics of an effective thesis statement?

An effective thesis statement establishes one major idea. If a thesis introduces more than one idea, the paper will not have a tight focus. Most papers you will write will be relatively short and do not have room to discuss more than one major idea. Pay particular attention to your thesis statement if it includes the word “and” as this connecting word often joins new ideas. Note how the following thesis has more than one main idea: Healthcare reform must be addressed because so many Americans are uninsured or without adequate coverage, and politicians must work together to ensure new legislation is passed. In this example, the word “and” establishes an additional main idea and so the thesis lacks a clearly defined focus. To improve upon the thesis, the thesis would need to be streamlined and focus on one main idea. For example, a better thesis might be Politicians must work together to reform healthcare because too many Americans are without sufficient coverage.

An effective thesis statement is limited in scope. The thesis should limit the extent of the discussion to something manageable given the assignment—neither too broad nor too narrow. The thesis should establish a focus that is realistic and suitable for a substantive discussion of the main idea. Taking a stand on capital punishment, for example, is not realistic for a short research paper let alone an entire book—the topic is too broad. However, limiting the focus by narrowing the scope may work. You could argue that capital punishment does not reduce the crime rate or that lethal injection is the most humane form of capital punishment. In this way, the focus is something that realistically could be addressed in the paper.

An effective thesis statement clearly states the writer’s position. The thesis should state precisely and specifically what the paper will discuss. After reading the thesis, readers should know exactly what to expect. Avoid language that is too general, abstract, or otherwise confusing. If your thesis does not clearly establish your main idea, readers may have a difficult time following the development of the body paragraphs that follow. Here is an example of a thesis statement that is vague: Television violence is an issue that many face. Based on this thesis, do you understand what the writer is going to explore in the paper? Sure, television violence, but beyond that general subject, do you have any clear sense of what the writer will be exploring? Not at all! This thesis lacks the specificity it needs to orient readers appropriately so that they know what to expect in the discussion.

An effective thesis statement requires supporting evidence. The thesis expresses an idea that moves beyond a statement of fact and requires supporting content to “prove” the main idea. For example, a thesis that proclaims Barack Obama is the first African-American to be elected president of the United States would not be very good as it states a widely known fact. A better thesis might proclaim this: Barack Obama’s election as president of the United States marked a seminal moment in American politics. The revised thesis moves beyond simply stating a fact and, instead, presents a main idea that would require evidence to support.

There are two basic approaches to composing a thesis—forecasting the main points by embedding them in the thesis (an approach commonly referred to as the three-point thesis) or not including the main points in the thesis. Your approach will depend on the topic you are addressing as well as any particular requirements of the assignment.

A three-point thesis states the main idea of the essay and includes three key points as support. Take a look at the following thesis: Banning cigarette smoking in public places is an effective intervention to improve the public’s health by helping to reduce the dangers of second-hand smoke on non-smokers, encouraging current smokers to quit, and reducing healthcare costs. In this example, the main idea—the position the writer takes relative to the topic—is Banning cigarette smoking in public places is an effective intervention to improve the public’s health. This part of the thesis states what the writer claims to be true about the topic. How will the writer support this view? In this case, the thesis includes three telegraphed key points—by helping to reduce the dangers of second-hand smoke on non-smokers, encouraging current smokers to quit, and reducing healthcare costs.

The three-point thesis is the blueprint of the essay in that it not only establishes the main idea, but it also fleshes out the key points to that readers can anticipate a basic structure of the essay. Readers would expect each forecasted point to be discussed in the order presented—that is, the first section will discuss the first key point, the next section the second, and so on.

Another approach to composing a thesis is to state the main idea minus the key points. Using the example above, the thesis would read: Banning cigarette smoking in public places is an effective intervention to improve the public’s health. With this approach, the key points are not included in the thesis, yet the focus and direction are clear. Readers may not know the exact key points, but they understand the writer’s position on the topic and can anticipate the likely discussion that will follow. In this case, since the main idea states the view that banning smoking in public is an effective intervention to improve public health, it is logical to expect key points that address how this is so.

Please keep in mind that writing a good thesis is a process and a process requires time. While some folks might be able to come up with a humdinger of a thesis from the get-go that is not the norm. To this end, give yourself time to explore your topic and don’t be impatient. Draft a working thesis and revise as necessary. I hope you find this podcast helpful.

Thanks, everyone. Happy writing!

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Writing Resources

Tips for writing an effective thesis statement.

This handout is available for download in DOCX format and PDF format .

Thesis statements are essentially the driving force and backbone of an academic essay. Without a thesis statement, your essay will lack a cohesive argument and will read more like a list of statistics, quotations or connecting ideas. Before completing your thesis statement, ask yourself:

• Is your essay’s major claim complex? Is it insightful? Is it surprising or unexpected?
• Does your thesis respond to a question, tension or problem?
• Is your thesis stated clearly at the outset and does it evolve and develop throughout the paper?
• Does your thesis statement have a clear motive?

Effective thesis statements directly and boldly articulate a complex, arguable or surprising argument (or arguments) of your own which will need to develop throughout the essay. They should be intelligent, well thought-out responses to a question or problem your essay will address.

Weak Thesis Statements Often:

Make no claim.

• Example: This paper will examine the similarities and differences between two articles.
• Possible Solution: Put the articles in conversation with one another and raise specific issues they agree or disagree about.

Are Obviously True or Statements of Fact

• Example: Tourists are often out of place in other cultures.
• Possible Solution: Make an assertion your reader can argue with.

Restate Conventional Wisdom or Clichés

• Example: We shouldn’t judge others because it’s the inside that counts.
• Possible Solution: Seek to complicate your thesis by anticipating counterarguments; try offering something new to the cliché.

Offer Personal Conviction as the Basis for the Argument

• Example: Clearly, Kincaid is being one-sided.
• Possible Solution: Maintain some distance from your subject. Do not merely assume your idea is an objective or obvious truth.

Make Overly Broad Claims

• Example: Limerick shows her knowledge about the West.
• Possible Solution: Convert broad, generic categories into more specific, complex assertions. Find ways to bring out the complexity of your argument.

More Questions for Constructing Strong Thesis Statements:

A strong thesis statement is often not created all at once but will rather go through stages of revision. A thesis statement in its early form is called a “working thesis.” While honing and tightening your working thesis, ask yourself these questions:

• Does my thesis pass the “So what?” test? If a reader’s first response is likely to be “So what?” then you need to clarify it or connect it to some larger issue via a compelling motive.
• Is my thesis statement specific enough? Thesis statements that are too vague often do not have a strong argument. If your thesis contains words like “good” or “successful,” see if you could be more specific: why is something “good”; what specifically makes something “successful?”
• Does my essay support my thesis specifically and without wandering? If your thesis and the body of your essay do not seem to fit together, one of them has to change. It’s perfectly okay to change your working thesis to reflect things you have figured out in the course of writing your paper. Remember, always reassess and revise your writing as necessary!
• Does my thesis answer the question? Re-reading the question prompt after constructing a working thesis can help you fix an argument that misses the focus of the question.
• Does my thesis statement teach my reader something they did not already know? Am I bringing a new idea or perspective to the table on the issue or problem raised? Am I happy with what my thesis statement is saying?

Points to Remember:

• The thesis statement usually appears at the end of the first paragraph of a paper.
• A thesis is not the answer to a math problem; it is not supposed to be “correct.” Your thesis should be designed to persuade the reader that your point of view is valid and worthy of consideration.
• Make sure your thesis is your own argument and not simply the argument that you think your instructor or one of your sources would approve of.
• A thesis statement will never be perfect, because it is an attempt to encapsulate everything that will happen in your argument. Since it takes a whole paper to do that, your thesis will always lack something. Accept this and make it the best it can be regardless!

Credit: “Thesis Statements,” The University of North Carolina at Chapel Hill. 25 October 2017, http://writingcenter.unc.edu/tips-and-tools/thesis-statements ; “Developing Strong Thesis Statements,” Purdue Online Writing Lab. 25 October 2017, https://owl.english.purdue.edu/owl/resource/588/01/ .

• Resources for Students
• Writing Intensive Instructor Resources
• Research and Pedagogy

Developing a Thesis Statement

Many papers you write require developing a thesis statement. In this section you’ll learn what a thesis statement is and how to write one.

Keep in mind that not all papers require thesis statements . If in doubt, please consult your instructor for assistance.

What is a thesis statement?

A thesis statement . . .

• Makes an argumentative assertion about a topic; it states the conclusions that you have reached about your topic.
• Makes a promise to the reader about the scope, purpose, and direction of your paper.
• Is focused and specific enough to be “proven” within the boundaries of your paper.
• Is generally located near the end of the introduction ; sometimes, in a long paper, the thesis will be expressed in several sentences or in an entire paragraph.
• Identifies the relationships between the pieces of evidence that you are using to support your argument.

Not all papers require thesis statements! Ask your instructor if you’re in doubt whether you need one.

Identify a topic

Your topic is the subject about which you will write. Your assignment may suggest several ways of looking at a topic; or it may name a fairly general concept that you will explore or analyze in your paper.

Consider what your assignment asks you to do

Inform yourself about your topic, focus on one aspect of your topic, ask yourself whether your topic is worthy of your efforts, generate a topic from an assignment.

Below are some possible topics based on sample assignments.

Sample assignment 1

Analyze Spain’s neutrality in World War II.

Identified topic

Franco’s role in the diplomatic relationships between the Allies and the Axis

This topic avoids generalities such as “Spain” and “World War II,” addressing instead on Franco’s role (a specific aspect of “Spain”) and the diplomatic relations between the Allies and Axis (a specific aspect of World War II).

Sample assignment 2

Analyze one of Homer’s epic similes in the Iliad.

The relationship between the portrayal of warfare and the epic simile about Simoisius at 4.547-64.

This topic focuses on a single simile and relates it to a single aspect of the Iliad ( warfare being a major theme in that work).

Developing a Thesis Statement–Additional information

Your assignment may suggest several ways of looking at a topic, or it may name a fairly general concept that you will explore or analyze in your paper. You’ll want to read your assignment carefully, looking for key terms that you can use to focus your topic.

Sample assignment: Analyze Spain’s neutrality in World War II Key terms: analyze, Spain’s neutrality, World War II

After you’ve identified the key words in your topic, the next step is to read about them in several sources, or generate as much information as possible through an analysis of your topic. Obviously, the more material or knowledge you have, the more possibilities will be available for a strong argument. For the sample assignment above, you’ll want to look at books and articles on World War II in general, and Spain’s neutrality in particular.

As you consider your options, you must decide to focus on one aspect of your topic. This means that you cannot include everything you’ve learned about your topic, nor should you go off in several directions. If you end up covering too many different aspects of a topic, your paper will sprawl and be unconvincing in its argument, and it most likely will not fulfull the assignment requirements.

For the sample assignment above, both Spain’s neutrality and World War II are topics far too broad to explore in a paper. You may instead decide to focus on Franco’s role in the diplomatic relationships between the Allies and the Axis , which narrows down what aspects of Spain’s neutrality and World War II you want to discuss, as well as establishes a specific link between those two aspects.

Before you go too far, however, ask yourself whether your topic is worthy of your efforts. Try to avoid topics that already have too much written about them (i.e., “eating disorders and body image among adolescent women”) or that simply are not important (i.e. “why I like ice cream”). These topics may lead to a thesis that is either dry fact or a weird claim that cannot be supported. A good thesis falls somewhere between the two extremes. To arrive at this point, ask yourself what is new, interesting, contestable, or controversial about your topic.

As you work on your thesis, remember to keep the rest of your paper in mind at all times . Sometimes your thesis needs to evolve as you develop new insights, find new evidence, or take a different approach to your topic.

Derive a main point from topic

Once you have a topic, you will have to decide what the main point of your paper will be. This point, the “controlling idea,” becomes the core of your argument (thesis statement) and it is the unifying idea to which you will relate all your sub-theses. You can then turn this “controlling idea” into a purpose statement about what you intend to do in your paper.

Look for patterns in your evidence

Compose a purpose statement.

Consult the examples below for suggestions on how to look for patterns in your evidence and construct a purpose statement.

• Franco first tried to negotiate with the Axis
• Franco turned to the Allies when he couldn’t get some concessions that he wanted from the Axis

Possible conclusion:

Spain’s neutrality in WWII occurred for an entirely personal reason: Franco’s desire to preserve his own (and Spain’s) power.

Purpose statement

This paper will analyze Franco’s diplomacy during World War II to see how it contributed to Spain’s neutrality.

• The simile compares Simoisius to a tree, which is a peaceful, natural image.
• The tree in the simile is chopped down to make wheels for a chariot, which is an object used in warfare.

At first, the simile seems to take the reader away from the world of warfare, but we end up back in that world by the end.

This paper will analyze the way the simile about Simoisius at 4.547-64 moves in and out of the world of warfare.

Derive purpose statement from topic

To find out what your “controlling idea” is, you have to examine and evaluate your evidence . As you consider your evidence, you may notice patterns emerging, data repeated in more than one source, or facts that favor one view more than another. These patterns or data may then lead you to some conclusions about your topic and suggest that you can successfully argue for one idea better than another.

For instance, you might find out that Franco first tried to negotiate with the Axis, but when he couldn’t get some concessions that he wanted from them, he turned to the Allies. As you read more about Franco’s decisions, you may conclude that Spain’s neutrality in WWII occurred for an entirely personal reason: his desire to preserve his own (and Spain’s) power. Based on this conclusion, you can then write a trial thesis statement to help you decide what material belongs in your paper.

Sometimes you won’t be able to find a focus or identify your “spin” or specific argument immediately. Like some writers, you might begin with a purpose statement just to get yourself going. A purpose statement is one or more sentences that announce your topic and indicate the structure of the paper but do not state the conclusions you have drawn . Thus, you might begin with something like this:

• This paper will look at modern language to see if it reflects male dominance or female oppression.
• I plan to analyze anger and derision in offensive language to see if they represent a challenge of society’s authority.

At some point, you can turn a purpose statement into a thesis statement. As you think and write about your topic, you can restrict, clarify, and refine your argument, crafting your thesis statement to reflect your thinking.

As you work on your thesis, remember to keep the rest of your paper in mind at all times. Sometimes your thesis needs to evolve as you develop new insights, find new evidence, or take a different approach to your topic.

Compose a draft thesis statement

If you are writing a paper that will have an argumentative thesis and are having trouble getting started, the techniques in the table below may help you develop a temporary or “working” thesis statement.

Begin with a purpose statement that you will later turn into a thesis statement.

Assignment: Discuss the history of the Reform Party and explain its influence on the 1990 presidential and Congressional election.

Purpose Statement: This paper briefly sketches the history of the grassroots, conservative, Perot-led Reform Party and analyzes how it influenced the economic and social ideologies of the two mainstream parties.

Question-to-Assertion

If your assignment asks a specific question(s), turn the question(s) into an assertion and give reasons why it is true or reasons for your opinion.

Assignment : What do Aylmer and Rappaccini have to be proud of? Why aren’t they satisfied with these things? How does pride, as demonstrated in “The Birthmark” and “Rappaccini’s Daughter,” lead to unexpected problems?

Beginning thesis statement: Alymer and Rappaccinni are proud of their great knowledge; however, they are also very greedy and are driven to use their knowledge to alter some aspect of nature as a test of their ability. Evil results when they try to “play God.”

Write a sentence that summarizes the main idea of the essay you plan to write.

Main idea: The reason some toys succeed in the market is that they appeal to the consumers’ sense of the ridiculous and their basic desire to laugh at themselves.

Make a list of the ideas that you want to include; consider the ideas and try to group them.

• nature = peaceful
• war matériel = violent (competes with 1?)
• need for time and space to mourn the dead
• war is inescapable (competes with 3?)

Use a formula to arrive at a working thesis statement (you will revise this later).

• although most readers of _______ have argued that _______, closer examination shows that _______.
• _______ uses _______ and _____ to prove that ________.
• phenomenon x is a result of the combination of __________, __________, and _________.

What to keep in mind as you draft an initial thesis statement

Beginning statements obtained through the methods illustrated above can serve as a framework for planning or drafting your paper, but remember they’re not yet the specific, argumentative thesis you want for the final version of your paper. In fact, in its first stages, a thesis statement usually is ill-formed or rough and serves only as a planning tool.

As you write, you may discover evidence that does not fit your temporary or “working” thesis. Or you may reach deeper insights about your topic as you do more research, and you will find that your thesis statement has to be more complicated to match the evidence that you want to use.

You must be willing to reject or omit some evidence in order to keep your paper cohesive and your reader focused. Or you may have to revise your thesis to match the evidence and insights that you want to discuss. Read your draft carefully, noting the conclusions you have drawn and the major ideas which support or prove those conclusions. These will be the elements of your final thesis statement.

Sometimes you will not be able to identify these elements in your early drafts, but as you consider how your argument is developing and how your evidence supports your main idea, ask yourself, “ What is the main point that I want to prove/discuss? ” and “ How will I convince the reader that this is true? ” When you can answer these questions, then you can begin to refine the thesis statement.

Refine and polish the thesis statement

To get to your final thesis, you’ll need to refine your draft thesis so that it’s specific and arguable.

• Ask if your draft thesis addresses the assignment
• Question each part of your draft thesis
• Clarify vague phrases and assertions
• Investigate alternatives to your draft thesis

Consult the example below for suggestions on how to refine your draft thesis statement.

Sample Assignment

Choose an activity and define it as a symbol of American culture. Your essay should cause the reader to think critically about the society which produces and enjoys that activity.

• Ask The phenomenon of drive-in facilities is an interesting symbol of american culture, and these facilities demonstrate significant characteristics of our society.This statement does not fulfill the assignment because it does not require the reader to think critically about society.

Drive-ins are an interesting symbol of American culture because they represent Americans’ significant creativity and business ingenuity.

Among the types of drive-in facilities familiar during the twentieth century, drive-in movie theaters best represent American creativity, not merely because they were the forerunner of later drive-ins and drive-throughs, but because of their impact on our culture: they changed our relationship to the automobile, changed the way people experienced movies, and changed movie-going into a family activity.

While drive-in facilities such as those at fast-food establishments, banks, pharmacies, and dry cleaners symbolize America’s economic ingenuity, they also have affected our personal standards.

While drive-in facilities such as those at fast- food restaurants, banks, pharmacies, and dry cleaners symbolize (1) Americans’ business ingenuity, they also have contributed (2) to an increasing homogenization of our culture, (3) a willingness to depersonalize relationships with others, and (4) a tendency to sacrifice quality for convenience.

This statement is now specific and fulfills all parts of the assignment. This version, like any good thesis, is not self-evident; its points, 1-4, will have to be proven with evidence in the body of the paper. The numbers in this statement indicate the order in which the points will be presented. Depending on the length of the paper, there could be one paragraph for each numbered item or there could be blocks of paragraph for even pages for each one.

Complete the final thesis statement

The bottom line.

As you move through the process of crafting a thesis, you’ll need to remember four things:

• Context matters! Think about your course materials and lectures. Try to relate your thesis to the ideas your instructor is discussing.
• As you go through the process described in this section, always keep your assignment in mind . You will be more successful when your thesis (and paper) responds to the assignment than if it argues a semi-related idea.
• Your thesis statement should be precise, focused, and contestable ; it should predict the sub-theses or blocks of information that you will use to prove your argument.
• Make sure that you keep the rest of your paper in mind at all times. Change your thesis as your paper evolves, because you do not want your thesis to promise more than your paper actually delivers.

In the beginning, the thesis statement was a tool to help you sharpen your focus, limit material and establish the paper’s purpose. When your paper is finished, however, the thesis statement becomes a tool for your reader. It tells the reader what you have learned about your topic and what evidence led you to your conclusion. It keeps the reader on track–well able to understand and appreciate your argument.

Writing Process and Structure

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Getting Started with Your Paper

Interpreting Writing Assignments from Your Courses

Generating Ideas for

Creating an Argument

Thesis vs. Purpose Statements

Architecture of Arguments

Working with Sources

Quoting and Paraphrasing Sources

Using Literary Quotations

Citing Sources in Your Paper

Drafting Your Paper

Generating Ideas for Your Paper

Introductions

Paragraphing

Developing Strategic Transitions

Conclusions

Revising Your Paper

Peer Reviews

Reverse Outlines

Revising an Argumentative Paper

Revision Strategies for Longer Projects

Finishing Your Paper

Twelve Common Errors: An Editing Checklist

How to Proofread your Paper

Writing Collaboratively

Collaborative and Group Writing

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Writing Effective Thesis Statements

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A good thesis statement can be the difference between making an argument about something, and simply re-stating what someone else has already said. In your thesis statement, you want to make a claim that you will continue to develop throughout the paper. It should represent your own ideas–perhaps in response to something someone else has said–but ultimately, it is your argument. As such, a good thesis statement should have 3 main traits. A good thesis:

• Can be developed with evidence throughout your paper. In other words, you should be able to say it in 1-2 sentences, but that shouldn’t be all that there is to say on the topic.
• Is argumentative, not in a negative sense, but in that it can be supported and may have counter-arguments. Test this by asking “Could I argue the reverse of this?”
• Should explain what, why, and how. What are you arguing? Why are you arguing that? And how will you show it? Think of the “what” as your basic position, the “why” as your reasoning, and the “how” as your evidence (theories, sources, etc.)

In all, the thesis is the backbone of your paper. In the rest of your paper, something in each paragraph should directly relate back to the paper. If you get lost in the writing process, you’ll want to be able to come back to your thesis and say, “this is what I’m arguing.” And remember, thesis statements can evolve with the paper. Once you’ve got your draft written, read through and make sure that what you’re saying in your paper matches up with what your thesis statement says you’re going to be saying.

H ere are a few helpful links to get you started:

• https://owl.english.purdue.edu/owl/resource/545/01/

The Purdue OWL (Purdue University) is a great source for writing, and this page goes into detail on the different types of thesis statements.

• http://writingcenter.unc.edu/handouts/thesis-statements/

Here’s another great source from the University of North Carolina with some tips and examples of strong thesis statements.

It can be useful to play around with and see examples, but DO NOT use it to create your actual thesis, as this may be considered plagiarism!

Best of luck with your writing endeavors!

–Your friends at the PLU Writing Center

Chapter 5: Thesis Statements, Introductions, and Conclusions

Effective thesis statements, an effective thesis statement:.

• identifies—or PREVIEWS —for what you plan to argue or inform, and it “telegraphs” how you plan to do so; that is, it communicates what particular support for your claim or idea is going where in your essay
• the subject, or topic, of an essay might be World War II or Moby Dick; a thesis must then offer a way to understand the war or the novel
• not only grabs the interest of your reader, who now wants to see you support your unique interpretation, but also provides a focus for your argument or idea, one to which every part of your paper refers in the development of your position
• keeps the writer centered on the matter at hand and reduces the risk of intellectual wandering
• is a complete statement

A simple equation for what a thesis might look like this:

What you plan to discuss/argue + How you plan to discuss/argue it = Thesis + Preview

Steps To Write Effective Thesis Statement

• Choose a prompt or, if appropriate, select a topic: television violence and children
• What are the effects of television violence on children?
• Violence on television increases aggressive behavior in children.
• Avoid general phrasing and/or sweeping words such as “all” or “none” or “every”.
• Lead the reader toward the topic sentences (the subtopics needed to prove the thesis).
• While poor parenting and easy access to weapons may act as contributory factors, in fact when children are exposed to television violence they become less sensitive to the pain and suffering of others, are more fearful of the world around them, and are more likely to behave in aggressive or harmful ways toward others.

The Components of an Effective Thesis Statement

• You can’t just pluck a thesis out of thin air. Even if you have a terrific insight concerning a topic, it won’t be worth much unless you can logically and persuasively support it in the body of your essay. A thesis is the evolutionary result of a thinking process, not a miraculous creation. Formulating a thesis is not the first thing you do after reading an essay assignment .
• Substantial – Your thesis should be a claim  or idea for which it is easy to answer every reader’s question: “So what?”
• Supportable – A thesis must be a claim that you can prove with the evidence at hand (e.g., evidence from your texts or from your research). Your claim should not be outlandish, nor should it be mere personal opinion or preference (e.g., “Frederick Douglass is my favorite historical figure.”) It tackles a subject that could be adequately covered in the format of the project assigned.
• Precise – It is focused and specific. A strong thesis proves a point without discussing everything. It clearly asserts your own conclusion based on evidence. Note: Be flexible. It is perfectly okay to change your thesis!
• Arguable  – It should be contestable for persuasive essays, proposing an arguable point with which people could reasonably disagree.
• Relevant – If you are responding to an assignment, the thesis should answer the question your teacher has posed. In order to stay focused, pay attention to the task words in the assignment: summarize, argue, compare/contrast, etc.
• Aware of Counters or Confusions – It anticipates and refutes the counter-arguments or possible ambiguities..

The best thesis statement is a balance of specific details and concise language. Your goal is to articulate an argument in detail without burdening the reader with too much information.

How do I know if my thesis is strong?

If there’s time, run it by your instructor or make an appointment at the Writing Center to get some feedback. Even if you do not have time to get advice elsewhere, you can do some thesis evaluation of your own. When reviewing your first draft and its working thesis, ask yourself the following:

• Do I answer a question ? This might seem obvious, but it’s worth asking. No matter how intriguing or dazzling, a thesis that doesn’t answer a question is not a good thesis! Re-reading the question prompt after constructing a working thesis can help you fix an argument that misses the focus of the question.
• If your thesis contains vague words like “good” or “successful,” see if you could be more specific: why is something “good”; what makes something “successful”?
• If your thesis simply states facts that no one would, or even could, disagree with, it’s possible that you are simply providing a summary, rather than making an argument.
• Is there a clear preview of main points to develop/argue the thesis ? You want the preview to indicate the organization of the essay (be it informative, argumentative, analytical, or a combination of these tacts) to provide a roadmap for the reader and a plan for you are accountable. This is as important as the thesis statement itself!
• Can my essay support my thesis specifically and without wandering ? If your thesis and the body of your essay do not seem to go together, one of them has to change. It’s o.k. to change your working thesis to reflect things you have figured out in the course of writing your paper. Remember, always reassess and revise your writing as necessary.
• Does my thesis statement adequately address the direction words of the prompt: summarize, argue, compare/contrast, analyze, discuss, etc. ?

Suppose you are taking a course on 19th-century America, and the instructor hands out the following essay assignment: Compare and contrast the reasons why the North and South fought the Civil War. You turn on the computer and type out the following:

The North and South fought the Civil War for many reasons, some of which were the same and some different.

This weak thesis restates the question without providing any additional information. You will expand on this new information in the body of the essay, but it is important that the reader know where you are heading. A reader of this weak thesis might think, “What reasons? How are they the same? How are they different?” Ask yourself these same questions and begin to compare Northern and Southern attitudes (perhaps you first think, “The South believed slavery was right, and the North thought slavery was wrong”). Now, push your comparison toward an interpretation—why did one side think slavery was right and the other side think it was wrong? You look again at the evidence, and you decide that you are going to argue that the North believed slavery was immoral while the South believed it upheld the Southern way of life. You write:

While both sides fought the Civil War over the issue of slavery, the North fought for moral reasons while the South fought to preserve its own institutions.

Now you have a working thesis! Included in this working thesis is a reason for the war and some idea of how the two sides disagreed over this reason. As you write the essay, you will probably begin to characterize these differences more precisely, and your working thesis may start to seem too vague. Maybe you decide that both sides fought for moral reasons, and that they just focused on different moral issues. You end up revising the working thesis into a final thesis that really captures the argument in your paper:

While both Northerners and Southerners believed they fought against tyranny and oppression, Northerners focused on the oppression of slaves while Southerners defended their own right to self-government.

Compare this to the original weak thesis. This final thesis presents a way of interpreting evidence that illuminates the significance of the question. Keep in mind that this is one of many possible interpretations of the Civil War—it is not the one and only right answer to the question . There isn’t one right answer; there are only strong and weak thesis statements and strong and weak uses of evidence.

Let’s look at another example. Suppose your literature professor hands out the following  assignment in a class on the American novel: Write an analysis of some aspect of Mark Twain’s novel Huckleberry Finn. “This will be easy,” you think. “I loved Huckleberry Finn!” You grab a pad of paper and write:

Mark Twain’s Huckleberry Finn is a great American novel.

Why is this thesis weak? Think about what the reader would expect from the essay that follows: you will most likely provide a general, appreciative summary of Twain’s novel. The question did not ask you to summarize; it asked you to analyze. Your professor is probably not interested in your opinion of the novel; instead, she wants you to think about why it’s such a great novel— what do Huck’s adventures tell us about life, about America, about coming of age, about race relations, etc.? First, the question asks you to pick an aspect of the novel that you think is important to its structure or meaning—for example, the role of storytelling, the contrasting scenes between the shore and the river, or the relationships between adults and children. Now you write:

In Huckleberry Finn, Mark Twain develops a contrast between life on the river and life on the shore.

Here’s a working thesis with potential: you have highlighted an important aspect of the novel for investigation; however, it’s still not clear what your analysis will reveal. Your reader is intrigued, but is still thinking, “So what? What’s the point of this contrast? What does it signify?” Perhaps you are not sure yet, either. That’s fine—begin to work on comparing scenes from the book and see what you discover. Free write, make lists, jot down Huck’s actions and reactions. Eventually you will be able to clarify for yourself, and then for the reader, why this contrast matters. After examining the evidence and considering your own insights, you write:

Through its contrasting river and shore scenes, Twain’s Huckleberry Finn suggests that to find the true expression of American democratic ideals, one must leave “civilized” society and go back to nature.

This final thesis statement presents an interpretation of a literary work based on an analysis of its content. Of course, for the essay itself to be successful, you must now present evidence from the novel that will convince the reader of your interpretation.

Myths about Thesis Statements

• Every paper requires one . Assignments that ask you to write personal responses or to explore a subject don’t want you to seem to pre-judge the issues. Essays of literary interpretation often want you to be aware of many effects rather than seeming to box yourself into one view of the text.
• A thesis statement must come at the end of the first paragraph . This is a natural position for a statement of focus, but it’s not the only one. Some theses can be stated in the opening sentences of an essay; others need a paragraph or two of introduction; others can’t be fully formulated until the end.
• A thesis statement must be one sentence in length , no matter how many clauses it contains. Clear writing is more important than rules like these. Use two or three sentences if you need them. A complex argument may require a whole tightly-knit paragraph to make its initial statement of position.
• You can’t start writing an essay until you have a perfect thesis statement . It may be advisable to draft a hypothesis or tentative thesis statement near the start of a big project, but changing and refining a thesis is a main task of thinking your way through your ideas as you write a paper. And some essay projects need to explore the question in depth without being locked in before they can provide even a tentative answer.
• A thesis statement must give three points of support . It should indicate that the essay will explain and give evidence for its assertion, but points don’t need to come in any specific number.

Progressively Complex Thesis Statements

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Constraining Explosion Physics and Progenitors of Transients via Statistical Inferencing of All Sky Survey Data Streams

Advancements in astronomical imaging all-sky surveys are revolutionising the field of time domain astronomy. However, the immense volume of alert data presents a critical bottleneck in maximizing scientific returns from these surveys. Effectively analyzing alert streams to discover transients in unexplored physical parameter spaces is crucial for enhancing scientific output. Building robust infrastructure to identify, prioritize, and execute efficient follow-up strategies on alert streams from all-sky surveys becomes critical. My thesis confronts this challenge through a multidisciplinary approach, by integrating statistical methods, machine learning algorithms, and hydrodynamical simulations to constrain transient explosion properties and motivate effective follow-up initiatives.

I analyze a sample of 45 Type II supernovae from the Zwicky Transient Facility (ZTF) public survey using a grid of hydrodynamical models in order to assess whether theoretically driven forecasts can intelligently guide follow-up observations supporting all-sky survey alert streams. I estimate several progenitor properties and explosion physics parameters, including zero-age main-sequence (ZAMS) mass, mass-loss rate, kinetic energy, 56 Ni mass synthesized, host extinction, and the time of the explosion. This work involves simulations of real-time of evolving incomplete light curves of the sample (∆t < 25 days, ∆t < 50 days, all data) leading to the conclusion that certain physical parameters exhibit greater reliability as indicators of true values during early epochs. This study emphasises the vital role of real-time modeling of transients, supported by multi-band synthetic light curves tailored to survey passbands, for identifying interesting transients based on their progenitor and explosion properties and determining critical epochs for follow-up observations.

In my thesis, I report multi wavelength observations and characterization of the ultraluminous transient AT 2021lwx (ZTF20abrbeie; aka“Barbie”) identified in the ZTF alert stream, that was flagged as an anomaly by the Recommender Engine For Intelligent Transient Track-ing (REFITT). From a spectroscopically measured redshift of 0.9945, and slowly fading g and r light curves spanning over 1000 observer-frame days that peak with an absolute magnitude of Mr = −25.7 mag, AT 2021lwx has an extraordinary peak pseudo-bolometric luminosity of log (Lmax/[erg/s]) = 45.7. The total radiative energy is over 10 53 erg, and as of today, the transient continues to decline slowly following a t −5/3 power-law. Modeling available photometry with MOSFiT suggests that AT 2021lwx is a tidal disruption event (TDE) candidate involving a ≈ 14 or 15 solar mass star accreting onto a supermassive black hole (SMBH) with mass M BH ≈ 10 8 solar mass. But, intriguingly, no host galaxy associated with the theorized SMBH is detected yet. The Pan-STARRS non-detections do not definitively exclude the existence of a galaxy hosting AT 2021lwx. Utilizing EzGal, upper limits on the stellar mass for different stellar population models were determined. These upper limits suggest that a 10 10 solar mass host galaxy cannot be ruled out.

The enhanced sensitivity of upcoming large-scale all-sky surveys enables the early detection of transients, providing unique insights into their progenitor systems, an example being detection of shock cooling emission (SCE) in light curves of stripped-envelope supernovae(SESNe). Leveraging a statistically significant sample of these events with early detections from all-sky surveys presents an invaluable opportunity to constrain their environments, pro-genitors, and explosion properties. In my final study contributing to this thesis, I analyze a sample of 16 SESNe identified from the ZTF survey, characterised by prominent shock cooling emission features in their light curves. By modeling the SCE and the radioactive peak in these transients, I derive estimates of progenitor radius, mass of the extended envelope and explosion properties of SESNe. This analysis yields upper limits and ranges for the compactness and envelope structures of the SESN progenitors that exhibit SCE in their light curves. I conclude my thesis with a summary of the findings and their future applications.

Degree Type

• Doctor of Philosophy
• Physics and Astronomy

Campus location

• West Lafayette

Advisor/Supervisor/Committee Chair

Additional committee member 2, additional committee member 3, additional committee member 4, usage metrics.

• Stellar astronomy and planetary systems