Astrophysics (index)

Hot Jupiter

(HJ, Inflated Gas Giant)
(Jupiter-sized gas exoplanet orbiting very close to star)

Hot Jupiter (HJ) is a term for a gas Extra Solar Planet the size of Jupiter or larger orbiting close to their parent star, e.g., less than half an AU. Less than .1 AU is not uncommon and extremely close ones can have very short orbital periods, i.e., their "years" can be less than an Earth day. Also, some orbit retrograde.

The term Inflated Gas Giant is also used for such planets. Being hot, the gas expands, increasing the volume, thus decreasing the density.

Being heavy, close to the star, and having short orbital periods, hot jupiters are the easiest planets to find: the star's Radial Velocity is high and other signs of an exoplanet are also more pronounced.

(planet type,exoplanets)

Referenced by:
Corotation Torque
Extra Solar Planet
Giant Planet
Inflated Radii
Planetary Migration
Planet Type
Retrograde Hot Jupiter