Neptunian exoplanet

Short description: Type of exoplanet

Neptunian exoplanets are a class of exoplanets that 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.^[1]

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 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

Kepler

GJ

GJ 436b

TOI

TOI-421c
TOI-532b
TOI-824b
TOI-1231b
TOI-2374b
TOI-4010b
TOI-4010c
TOI-4010d

LTT

LTT 9779b

HAT

OGLE

Other

Mu Arae c- first hot Neptune discovered
NGTS-4b
NGTS-14Ab
KMT-2017-BLG-0165Lb

References

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Original source: https://en.wikipedia.org/wiki/Neptunian exoplanet. Read more

[1] "Neptune-like | Planet Types". https://exoplanets.nasa.gov/what-is-an-exoplanet/planet-types/neptune-like.

[:0-2] "Eyes On Exoplanets – Exoplanet Exploration: Planets Beyond our Solar System". https://exoplanets.nasa.gov/eyes-on-exoplanets/#/system/HAT-P-26/.

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