astronomy

XO-6b

XO-6b 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 XO-6b rather than just read about it. In short: XO-6b is a transiting exoplanet, orbiting the star XO-6 around 760 light years (230 parsecs) away from Earth. It was discovered in 2016 by the XO planet search team.

Key takeaways

XO-6b belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect XO-6b to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of XO-6b from memory before moving on to harder problems.

Reference excerpt

XO-6b is a transiting exoplanet, orbiting the star XO-6 around 760 light years (230 parsecs) away from Earth. It was discovered in 2016 by the XO planet search team.

Characteristics XO-6b is classified as a hot Jupiter. The planet has an orbital period of just 3.8 days and an average orbital separation of 0.082 astronomical units. As of such, it is highly irradiated, with a surface temperature estimated to be around 1,670 K (1,400 °C). The planet's mass is estimated at 4.47±0.12 MJ. The discovery paper suggested a very large radius of 2.07±0.22 RJ, which would make it among the largest known exoplanets, but more recent papers, considering the measurements of the host star's distance by the Gaia satellite, found the radius to be smaller, at around 1.5 RJ.

Host star

XO-6b orbits XO-6, a faint 10th magnitude star in the constellation Camelopardalis. Due to its magnitude, this star is too faint to be seen with the naked eye, but can be seen with a telescope. XO-6 is a F-type main-sequence star with about 1.30 times the mass of the Sun. It is also radiating three times as bright, and is 1.4 times the size of the Sun. It is also hotter, with a temperature of 6724 K, which gives it the typical hue of an F-type star. Unlike most other stars of its kind, XO-6 rotates rapidly at a rate of 43 km/s.

References

Further reading Garai, Zoltán; et al. (January 2020). "Periodic transit timing variations and refined system parameters of the exoplanet XO-6b". Monthly Notices of the Royal Astronomical Society. 491 (2): 2760–2769. arXiv:1911.07054. Bibcode:2020MNRAS.491.2760G. doi:10.1093/mnras/stz3235. Ridden-Harper, Andrew; Turner, Jake D.; Jayawardhana, Ray (December 2020). "TESS Observations of the Hot Jupiter Exoplanet XO-6b: No Evidence of Transit Timing Variations". The Astronomical Journal. 160 (6): 249. arXiv:2009.10781. Bibcode:2020AJ....160..249R. doi:10.3847/1538-3881/abba1e. S2CID 221856652.

Illustrations

Worked examples

Example 1 — a first encounter with XO-6b

Start with the simplest possible case. Write down what XO-6b 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 XO-6b 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 XO-6b 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 XO-6b

In research: XO-6b 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 XO-6b 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: XO-6b is common in secondary-school and first-year university syllabi. It links to neighbouring topics Camelopardalis, Exoplanets discovered in 2016, Hot Jupiters, so understanding it makes those chapters shorter.
In everyday life: Look for XO-6b 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 XO-6b in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what XO-6b 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 XO-6b out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is XO-6b in simple terms?

XO-6b is a transiting exoplanet, orbiting the star XO-6 around 760 light years (230 parsecs) away from Earth. It was discovered in 2016 by the XO planet search team.

Why does XO-6b 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 XO-6b?

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 XO-6b.