Neptunian exoplanet

Short description: Type of exoplanet

A ringed Exo-Neptune.

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

## Contents

* 1 List of Neptunian exoplanets
* 1.1 Kepler
* 1.2 GJ
* 1.3 TOI
* 1.4 LTT
* 1.5 HAT
* 1.6 OGLE
* 1.7 Other
* 2 References

## List of Neptunian exoplanets

This list is incomplete; you can help by expanding it.

### Kepler

* Kepler-56b
* Kepler-102e

### GJ

* GJ 436b

### TOI

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

### LTT

* LTT 9779b

### HAT

* HAT-P-26b[2]
* HAT-P-11b

### OGLE

* OGLE-2005-BLG-169Lb
* OGLE-2005-BLG-390Lb

### Other

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

## References

1. ↑ "Neptune-like | Planet Types". https://exoplanets.nasa.gov/what-is-an-exoplanet/planet-types/neptune-like.
2. ↑ "Eyes On Exoplanets – Exoplanet Exploration: Planets Beyond our Solar System". https://exoplanets.nasa.gov/eyes-on-exoplanets/#/system/HAT-P-26/.

* v
* t
* e

Exoplanetology

* Planet
* Definition
* IAU
* Planetary science

Main topics|

* Exoplanet
* Methods of detecting exoplanets
* Planetary system

Sizes
and types|

| Terrestrial|

* Carbon planet
* Coreless planet
* Desert planet
* Dwarf planet
* Ice planet
* Iron planet
* Lava planet
* Mega-Earth
* Ocean planet
* Sub-Earth
* Super-Earth

|

Gaseous|

* Eccentric Jupiter
* Gas dwarf
* Helium planet
* Hot Jupiter
* Hot Neptune
* Ice giant
* Mini-Neptune
* Super-Neptune
* Super-Jupiter

Other types|

* Brown dwarf
* Chthonian planet
* Circumbinary planet
* Disrupted planet
* Double planet
* Eyeball planet
* Mesoplanet
* Planemo
* Planet/Brown dwarf boundary
* Planetesimal
* Protoplanet
* Pulsar planet
* Sub-brown dwarf
* Ultra-cool dwarf
* Ultra-short period planets (USP)

Formation
and evolution|

* Accretion
* Accretion disk
* Asteroid belt
* Circumplanetary disk
* Circumstellar disc
* Circumstellar envelope
* Cosmic dust
* Debris disk
* Detached object
* Disrupted planet
* Excretion disk
* Exoplanetary Circumstellar Environments and Disk Explorer
* Exozodiacal dust
* Extraterrestrial materials
* Extraterrestrial sample curation
* Giant-impact hypothesis
* Gravitational collapse
* Hills cloud
* Interplanetary dust cloud
* Interplanetary medium
* Interplanetary space
* Interstellar cloud
* Interstellar dust
* Interstellar medium
* Interstellar space
* Kuiper belt
* List of interstellar and circumstellar molecules
* Merging stars
* Molecular cloud
* Nebular hypothesis
* Oort cloud
* Outer space
* Planetary migration
* Planetary system
* Planetesimal
* Planet formation
* Protoplanetary disk
* Ring system
* Rubble pile
* Sample-return mission
* Scattered disc
* Star formation

Systems|

* Exocomet
* Exomoon
* Interstellar comet
* Mean-motion resonances
* Retrograde planet
* Rogue planet
* Tidally detached exomoon
* Titius–Bode laws
* Trojan planet

Host stars|

* A
* B
* Binary star
* Brown dwarfs
* Extragalactic planet
* F/Yellow-white dwarfs
* G/Yellow dwarfs
* Herbig Ae/Be
* K/Orange dwarfs
* M/Red dwarfs
* Planets in globular clusters
* Pulsar
* Red giant
* Subdwarf B
* Subgiant
* T Tauri
* White dwarfs
* Yellow giants

Detection|

* Astrometry
* Direct imaging
* list
* Microlensing
* list
* Polarimetry
* Pulsar timing
* list
* Radial velocity
* list
* Transit method
* list
* Transit-timing variation

Habitability|

* Astrobiology
* Circumstellar habitable zone
* Earth analog
* Extraterrestrial liquid water
* Habitability of natural satellites
* Superhabitable planet

Catalogues|

* Catalog of Nearby Habitable Systems
* Exoplanet Data Explorer
* Extrasolar Planets Encyclopaedia
* NASA Exoplanet Archive
* NASA Star and Exoplanet Database

Lists|

* Exoplanetary systems
* Host stars
* Multiplanetary systems
* Stars with proplyds
* Exoplanets
* Lists of exoplanets
* Discoveries
* Extremes
* Firsts
* Nearest
* Largest
* Most massive
* Terrestrial candidates
* Kepler
* Potentially habitable
* Discovered exoplanets by year
* before 2000
* 2000–2009
* 2010
* 2011
* 2012
* 2013
* 2014
* 2015
* 2016
* 2017
* 2018
* 2019

Other|

* Carl Sagan Institute
* Exoplanet phase curves
* Nexus for Exoplanet System Science
* Planets in science fiction
* Sudarsky's gas giant classification

* Discoveries of exoplanets
* Search projects

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