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Hot Jupiter
Class of high mass planets orbiting close to a star / From Wikipedia, the free encyclopedia
Hot Jupiters (sometimes called hot Saturns) are a class of gas giant exoplanets that are inferred to be physically similar to Jupiter but that have very short orbital periods (P < 10 days).[1] The close proximity to their stars and high surface-atmosphere temperatures resulted in their informal name "hot Jupiters".[2]
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Hot Jupiters are the easiest extrasolar planets to detect via the radial-velocity method, because the oscillations they induce in their parent stars' motion are relatively large and rapid compared to those of other known types of planets. One of the best-known hot Jupiters is 51 Pegasi b. Discovered in 1995, it was the first extrasolar planet found orbiting a Sun-like star. 51 Pegasi b has an orbital period of about 4 days.[3]