Puffy planet

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Puffy planet, also called fluffy planet, is a class of gas giant planets that have density of 0.5 g/cm³ at most. Puffy planets often orbit close to their stars because the intense heat from the star and internal heat within the planet bloat planet's atmosphere as in thermal expansion. There are three puffy planets have been detected by transit method in order of discovery: HAT-P-1b, COROT-Exo-1b, and TrES-4. There could be some hot Jupiters detected by radial velocity method can be so-called puffy planets.

The varying mass can affect properties of puffy planets. The massive planets (>2 Jupiters) are not puffy because the massive planets have strong gravity to keep planets from being very big. The less massive planets (<2 Jupiters) can be puffy if it is not massive enough to hold the planets together in tighter space.

[edit] External links

• Puffy 'cork' planet would float on water
• Puffy Planet discovered: It's largest world outside our solar system