astronomy

TOI-715

TOI-715 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-715 rather than just read about it. In short: TOI-715 is a red dwarf star located 42 parsecs (140 ly) from the Earth in the constellation Volans, very close to the southern celestial pole. It hosts one confirmed exoplanet, named TOI-715 b, a super-Earth orbiting in its habitable zone.

Key takeaways

TOI-715 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-715 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of TOI-715 from memory before moving on to harder problems.

Reference excerpt

TOI-715 is a red dwarf star located 42 parsecs (140 ly) from the Earth in the constellation Volans, very close to the southern celestial pole. It hosts one confirmed exoplanet, named TOI-715 b, a super-Earth orbiting in its habitable zone. Another planet in the system is suspected. The star has an apparent magnitude of 16.7 and is too faint to be seen with the naked eye or even a small telescope. It is smaller and cooler than the Sun, with 24% its radius and a temperature of 3,075 K (2,802 °C) (53% solar).

Characteristics TOI-715 is a red dwarf star, a type of stars that are smaller, cooler and dimmer than the Sun, and are the most common type of stars in the Universe. TOI-715 in particular has 24% of the Sun's radius, 23% of its mass, and a surface temperature of 3,075 K (2,802 °C), while the Sun has a surface temperature of 5,772 K (5,499 °C). It is older than the Sun and has an age of 6.6+3.3−2.2 billion years, and therefore has lower magnetic activity. Its metallicity, i.e. the abundance of elements other than hydrogen and helium, is 23% larger than the Sun's.

Planetary system In 2023, a planetary companion was detected around TOI-715. The planet was initially identified by the Transiting Exoplanet Survey Satellite (TESS), on May 24, 2019, and later confirmed using ground-based photometry. Designated TOI-715 b, the planet is a super-Earth (radius = 1.55 R🜨) that is orbiting within its star's conservative habitable zone, being the first TESS discovery in this region. The planet has an orbital period of 19 days and is orbiting TOI-715 at a distance of 0.083 astronomical units (12,400,000 km). It receives insolation from its host star equivalent to 67% of the insolation received by the Earth from the Sun, and has an equilibrium temperature of -39 °C. Another planet in the system is suspected. This planet has an orbital period of 25.6 days and has a radius of 1.066 R🜨. It is located in the outer edge of the habitable zone. If confirmed, it would be the smallest habitable-zone planet discovered by TESS. The planet TOI-715 b could be more closely scrutinized by the James Webb Space Telescope for confirming the existence of an atmosphere. If TOI-715 b is an ocean planet, its atmosphere would be more prominent and easier to detect than that of a massive, dense, dry planet. The planet can also be characterized with precise radial velocity measurements and transmission spectroscopy, and detailed follow-up research of this planet can help the understanding of the formation of small and close-in planets. The planetary system of TOI-715 is located relatively close to Earth, at a distance of 137 light-years.

Conservative habitable zone The concept of "conservative habitable zone" was defined by Koparappu et al. in 2014. It is the region where the planet receives insolation equivalent to 0.42 to 0.842 times the insolation received by the Earth from the Sun. As both planets have insolations equivalent to 0.67+0.15−0.20 S🜨 and 0.48+0.12−0.17 S🜨 respectively, they are located inside the conservative habitable zone.

Notes

References

Worked examples

Example 1 — a first encounter with TOI-715

Start with the simplest possible case. Write down what TOI-715 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-715 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-715 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-715

In research: TOI-715 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-715 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-715 is common in secondary-school and first-year university syllabi. It links to neighbouring topics M-type main-sequence stars, Planetary systems with one confirmed planet, TESS Objects of Interest, so understanding it makes those chapters shorter.
In everyday life: Look for TOI-715 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-715 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what TOI-715 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-715 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is TOI-715 in simple terms?

Why does TOI-715 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-715?

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-715.