HD 189733 B

HD 189733 b (or sometimes HD 189733 Ab) is an extrasolar planet approximately 63 light-years away in the constellation of Vulpecula (the Fox). The planet was discovered orbiting the star HD 189733 on October 5, 2005 (more precisely HD 189733 A since a star companion had been confirmed by then), when astronomers in France observed the planet transiting across the face of the star. The planet is classified as a hot Jupiter class Jovian planet, with a close orbit to its parent star. HD 189733 b was the first extrasolar planet to be mapped and the first to be discovered with carbon dioxide in its atmosphere.

Read more about HD 189733 B:  Satellites, Physical Characteristics

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HD 189733 B - Physical Characteristics - Evolution
... By analogy with HD 149026 b, the formation of the planet was peaceful and probably involved interactions with the protoplanetary disc ...