astronomy

Kepler-35

Kepler-35 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 Kepler-35 rather than just read about it. In short: Kepler-35 is a binary star system in the constellation of Cygnus. These stars, called Kepler-35A and Kepler-35B have masses of 89% and 81% solar masses respectively, and both are assumed to be of spectral class G.

Key takeaways

Kepler-35 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Kepler-35 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Kepler-35 from memory before moving on to harder problems.

Reference excerpt

Kepler-35 is a binary star system in the constellation of Cygnus. These stars, called Kepler-35A and Kepler-35B have masses of 89% and 81% solar masses respectively, and both are assumed to be of spectral class G. They are separated by 0.176 AU, and complete an eccentric orbit around a common center of mass every 20.73 days.

Description The Kepler-35 system consists of two stars slightly less massive than the sun in a 21-day orbit aligned edge-on to us so that the stars eclipse each other. The orbit has a semi-major axis 0.2 au and a mild eccentricity of 0.16. of The precise measurements made by the Kepler satellite allow doppler beaming to be detected, as well as brightness variations due to the ellipsoidal shape of the stars and reflections of one star on the other. The primary star has a mass of 0.9 M☉ and a radius fractionally larger than the sun. With an effective temperature of 5,606 K, its luminosity is 0.94 L☉. The secondary star has a mass of 0.8 M☉, a radius of 0.8 R☉, an effective surface temperature of 5,202 K, and a bolometric luminosity of 0.4 L☉.

Planetary system Kepler-35b is a gas giant that orbits the two stars in the Kepler-35 system. The planet is over an eighth of Jupiter's mass and has a radius of 0.728 Jupiter radii. The planet completes a somewhat eccentric orbit every 131.458 days from a semimajor axis of just over 0.6 AU, only about 3.5 times the semi-major axis between the parent stars. The proximity and eccentricity of the binary star as well as both stars have similar masses results the planet's orbit to significantly deviate from Keplerian orbit. Studies have suggested that this planet must have been formed outside its current orbit and migrated inwards later. The eccentricity of planetary orbit is acquired on the last stage of migration, due to interaction with the residual debris disk. Numerical simulation of formation of planetary system Kepler-35 has shown the formation of additional rocky planets in the habitable zone is highly likely, and these planetary orbits are stable.

See also Kepler-16b – the first circumbinary exoplanet discovered by Kepler Kepler-34b – the previous circumbinary exoplanet discovered by Kepler Kepler-38b – the next circumbinary exoplanet discovered by Kepler List of exoplanets discovered in 2012

References

Further reading Demidova, T. V.; Shevchenko, I. I. (2018). "Simulations of the Dynamics of the Debris Disks in the Systems Kepler-16, Kepler-34, and Kepler-35". Astronomy Letters. 44 (2): 119. arXiv:1901.07390. Bibcode:2018AstL...44..119D. doi:10.1134/S1063773718010012. S2CID 119226649.

Illustrations

Worked examples

Example 1 — a first encounter with Kepler-35

Start with the simplest possible case. Write down what Kepler-35 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 Kepler-35 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 Kepler-35 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 Kepler-35

In research: Kepler-35 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 Kepler-35 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: Kepler-35 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Circumbinary planets, Cygnus (constellation), Eclipsing binaries, so understanding it makes those chapters shorter.
In everyday life: Look for Kepler-35 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 Kepler-35 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kepler-35 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 Kepler-35 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kepler-35 in simple terms?

Why does Kepler-35 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 Kepler-35?

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 Kepler-35.