astronomy

TrES-4b

TrES-4b 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 TrES-4b rather than just read about it. In short: TrES-4b is an exoplanet. It was discovered in 2006, and announced in 2007, by the Trans-Atlantic Exoplanet Survey, using the transit method.

Key takeaways

TrES-4b belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect TrES-4b to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of TrES-4b from memory before moving on to harder problems.

Reference excerpt

TrES-4b is an exoplanet. It was discovered in 2006, and announced in 2007, by the Trans-Atlantic Exoplanet Survey, using the transit method. At the time of its discovery TrES-4 was the largest confirmed exoplanet ever found; now more than 10 larger planets have been discovered. It is approximately 1,400 light-years (430 pc) away orbiting the star GSC 02620-00648, in the constellation Hercules.

Orbit TrES-4 orbits its primary star every 3.543 days and eclipses it when viewed from Earth. A 2008 study concluded that the GSC 02620-00648 system (among others) is a binary star system allowing even more accurate determination of stellar and planetary parameters. The study in 2012, utilizing a Rossiter–McLaughlin effect, have determined the planetary orbit is probably aligned with the equatorial plane of the star, misalignment equal to 6.3±4.7°.

Physical characteristics The planet is slightly less massive than Jupiter (0.919 ± 0.073 MJ) but its diameter is 84% larger. This give TrES-4 an average density of only about a third of a gram per cubic centimetre, approximately the same as Saturn's moon Methone. At the time of its discovery in 2007, TrES-4 was described as both the largest known planet and the planet with the lowest known density. TrES-4b's orbital radius is 0.05091 AU, giving it a predicted surface temperature of about 1,782 K (1,509 °C; 2,748 °F). This by itself is not enough to explain the planet's low density, however. It is not currently known why TrES-4b is so large. The probable causes are the proximity to a parent star that is three to four times more luminous than the Sun as well as the internal heat within the planet.

See also List of exoplanet extremes WASP-17b, another large exoplanet

References

External links Media related to TrES-4 at Wikimedia Commons

"Team finds largest exoplanet yet". BBC News. 7 August 2007. Retrieved 14 May 2023. Miller, Barbara; staff reporters (7 August 2007). "New monster planet 'could float on water'". ABC News (Australia). Retrieved 14 May 2023. Than, Ker (6 August 2007). "Largest Known Exoplanet Discovered". Space.com news service. Retrieved 14 May 2023. Muir, Hazel (6 August 2007). "Largest known exoplanet puzzles astronomers". NewScientist.com news service. Retrieved 14 May 2023.

Illustrations

Worked examples

Example 1 — a first encounter with TrES-4b

Start with the simplest possible case. Write down what TrES-4b 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 TrES-4b 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 TrES-4b 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 TrES-4b

In research: TrES-4b 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 TrES-4b 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: TrES-4b is common in secondary-school and first-year university syllabi. It links to neighbouring topics Exoplanets discovered in 2006, Giant planets, Hercules (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for TrES-4b 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 TrES-4b in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what TrES-4b 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 TrES-4b out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is TrES-4b in simple terms?

TrES-4b is an exoplanet. It was discovered in 2006, and announced in 2007, by the Trans-Atlantic Exoplanet Survey, using the transit method.

Why does TrES-4b 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 TrES-4b?

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 TrES-4b.