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# Extrasolar Planet HD 189733 b

The exoplanet HD 189733 b is one of the brighest transiting exoplanet systems, and one of the best-studied hot Jupiters. Currently it is difficult to study the compositions of exoplanet atmospheres but HD 189733 is one of the few exoplanets in which molecular species have been identified. Water vapour, methane, and carbon dioxide have been detected, although the latter has been challenged.

Advanced Readers: See, for example, Gibson et al. (2012) and references therein as a starting point for the literature on various results. (Also check citations to papers of key results).

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The star HD 189733 is at a distance of about 62.9 light years from Earth, and has mass of about 80% of that of our Sun, and a radius that is also about 80% of that of our Sun. The mass of the exoplanet HD 189733 b is about 1.1 times that of Jupiter ($1.138\pm0.025 \ M_{j}$), and its radius is also about the same as that of Jupiter. The orbital period of the planet is very short, as is typical for hot Jupiters. It is just 2.19 Earth days, corresponding to a star-planet distance hat is only about 3% of the Earth-sun distance ($0.03142\pm0.00052$ astronomical units (AU).

Learn more about exoplanets with the book Exoplanets and Alien Solar Systems.

File under: HD 189733 b; Well-studied transiting system and hot Jupiter; Hot Jupiter atmospheres.

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