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Hot Neptune
A hot Neptune is a type of giant planet with a mass similar to that of Uranus or Neptune in an orbit close to its star, normally less than 1 AU. The first hot Neptune to be discovered with certainty was Gliese 436 b in 2007, an exoplanet about 33 light years away. Recent observations have revealed a larger potential population of hot Neptunes in the Milky Way than previously thought.〔(Oligarchic formation of hot Neptunes )〕
== General characteristics ==
Because of their close proximity to their parent star, hot Neptunes have a much greater rate and chance of transiting their star as seen from a farther outlying point, than planets of the same mass in larger orbits. This increases the chances of discovering them by transit-based observation methods.
The most notable transiting hot Neptunes are Gliese 436 b and HAT-P-11b, which was recently observed by the Kepler mission. Gliese 436 b (also known as GJ 436b) was the first hot Neptune to be discovered with certainty in 2007. The exoplanet Mu Arae c (or HD 160691 c) discovered in 2004 might also be a hot Neptune, but it has not been determined definitively.
The first theoretical study of how hot Neptunes could be formed was carried out in 2004.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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