Hot Jupiter

The Jupiter heats or Pégasides are a class of Exoplanète S having a Masse same order of magnitude as that of Jupiter (1,9 × 10 27 kg). But contrary to our Solar system where Jupiter Orbit to 5 ua of the Sun, Pégasides is with approximately 0,05 ua of their principal star. By comparison, hot Jupiter orbits approximately eight times more close to its star that the planet Mercure around the Sun. These planets would be regarded as gas giant if they orbited at a distance equivalent to that of Mars or more.

Pégasides have all certain a number of common characteristics:

seen since the Ground, they have a probability of forwarding in front of their star much larger than of of the same another planets cuts on more remote orbits;
because of the very high temperature they have a density lower than that of more distant planets. This has important implications at the time of the observations and in particular for the determination of the diameter of planet, because of the obscuration of planet during the transit in front of its star, the borders of the disc can appear difficult to determine;
one thinks that they migrated all towards their current location after their formation, because there would not have been enough matter also close to a star to form a planet of this mass;
they have a whole a low eccentricity. This because their orbits were made circular (or are being it), by the process of Libration. This also involves the synchronization of the Period of rotation and the orbital Period, so that the planet always presents the same one vis-a-vis its star.

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