astronomy

TOI-700 e

TOI-700 e is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand TOI-700 e rather than just read about it. In short: TOI-700 e is the second outermost known exoplanet orbiting TOI-700, a red dwarf star in the constellation of Dorado. Host star TOI-700 is a red dwarf of spectral class M that is about 40% the mass and radius, and very roughly 50% of the temperature of the Sun.

Key takeaways

TOI-700 e belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect TOI-700 e to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of TOI-700 e from memory before moving on to harder problems.

Reference excerpt

TOI-700 e is the second outermost known exoplanet orbiting TOI-700, a red dwarf star in the constellation of Dorado.

Host star

TOI-700 is a red dwarf of spectral class M that is about 40% the mass and radius, and very roughly 50% of the temperature of the Sun. The star is bright with low levels of stellar activity. Over the 11 sectors observed with TESS, the star does not show a single white-light flare. The low rotation rate is also an indicator of low stellar activity.

Orbit TOI-700 e orbits its host star with an orbital period of 27.8 days, comparable with the Moon's orbital period of 27.5 Earth days. It has an orbital radius of about 0.134 AU (20.0 million km; 12.5 million mi), less than half of that of Mercury to the Sun in the Solar System. It receives about 127% of Earth's sunlight from its host star. TOI-700 e is in a near 4:3 orbital resonance with TOI-700 d.

Discovery In November 2021, in addition to the three planets already discovered around TOI-700, a fourth possible planet, Earth-sized and receiving approximately 30% more flux from its star than Earth does from the Sun, was found. In January 2023 the existence of this planet, now designated TOI-700 e, was confirmed. Discovered in 2023, TOI-700 e is terrestrial exoplanet that NASA claims to be an "earth-like" planet, with 95 percent of the Earth’s radius, 81.8% of Earth's mass, and roughly similar temperature. Discovered by NASA's TESS (Transiting Exoplanet Survey Satellite), TOI-700 e takes 27.8 days to orbit once around its star. The planet is at a temperate distance from its star, leading NASA scientists to believe that there is potential for liquid water on its surface. Ten percent smaller than its neighboring planet TOI-700 d, both are at a distance from their sun consistent with habitability, however, TESS requires an additional year to acquire more data about the exoplanets. Being one in only about a dozen habitable zone planets known, further research and data collection of the TOI-700 solar system are important for understanding Earth-like planets.

References

Illustrations

Worked examples

Example 1 — a first encounter with TOI-700 e

Start with the simplest possible case. Write down what TOI-700 e claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to TOI-700 e before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about TOI-700 e ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of TOI-700 e

In research: TOI-700 e appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses TOI-700 e in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: TOI-700 e is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dorado, Exoplanets discovered by TESS, Exoplanets discovered in 2023, so understanding it makes those chapters shorter.
In everyday life: Look for TOI-700 e outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study TOI-700 e in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what TOI-700 e means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain TOI-700 e out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is TOI-700 e in simple terms?

TOI-700 e is the second outermost known exoplanet orbiting TOI-700, a red dwarf star in the constellation of Dorado. Host star TOI-700 is a red dwarf of spectral class M that is about 40% the mass and radius, and very roughly 50% of the temperature of the Sun.

Why does TOI-700 e matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study TOI-700 e?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on TOI-700 e.