Neptunian Exoplanet
Neptunian exoplanets are similar in size to the ice giants Neptune and Uranus in the Solar System. Neptunian exoplanets may have a mixture of interiors though all would be rocky with heavier metals at their cores. Neptunian planets typically have hydrogen- and helium-dominated atmospheres. There are several recognized subtypes of Neptunian exoplanets: * Hot Neptune – orbiting close to its star * Helium planet – a hypothetical type that can form from hot Neptune via hydrogen Atmospheric escape, evaporation, leaving a helium-dominated atmosphere * Mini-Neptune – considerably smaller than Neptune but still having a thick hydrogen-helium envelope, relatively common * Super-puff – inflated planets with unusually low mean density * Hycean planet – a hypothetical transitional type to ocean planets with a thin, hydrogen-helium-dominated atmosphere overlaying a liquid water ocean List of Neptunian exoplanets HAT *HAT-P-26#Planetary system, HAT-P-26b *HAT-P-11b GJ *Gli ...
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