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Water-covered planet with a hydrogen-rich atmosphere
A hycean planet (/ˈhaɪʃən/ HY-shən) is a hypothetical type of planet with liquid water oceans underneath a hydrogen-rich atmosphere. They are thought to
Hycean_planet
Sub-Neptune orbiting the red dwarf K2-18
giant like Uranus or Neptune than Earth. It is the prototype for hycean planets, planets which have abundant water under a hydrogen envelope. A controversial
K2-18b
Astronomical bodies believed or speculated to exist
3847/1538-4357/abfd9c. S2CID 237290118. Anderson, Paul Scott (29 August 2021). "Hycean planets might be habitable ocean worlds". Earth & Sky. Retrieved 12 December
Hypothetical astronomical object
Hypothetical_astronomical_object
lists of planets. A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation
Lists_of_planets
Planet outside of the Solar System
capture List of planet types Desert planet Carbon planet Lava planet Eyeball planet Ocean world Ice planet Hycean planet Chthonian planet For the purpose
Exoplanet
Planet containing a significant amount of water or other liquid
Volatile-rich planets should be more common in the habitable zones of young stars and M-type stars. Scientists have proposed Hycean planets, ocean planets with
Ocean_world
Indian-British astronomer
compositions of exoplanets, and with coining the term "hycean planet" to describe a theorised class of planet which hosts a liquid water ocean beneath a hydrogen-rich
Nikku_Madhusudhan
Type of exoplanet
Super-puff – inflated planets with unusually low mean density Hycean planet – a hypothetical transitional type to ocean planets with a thin, hydrogen-helium-dominated
Neptunian_exoplanet
rather than being the Hycean planet and thus unlikely to be habitable. Kepler-1638b was thought to be a possibly habitable planet with a radius smaller
List of potentially habitable exoplanets
List_of_potentially_habitable_exoplanets
Planetary object disrupted by other body
In astronomy, a disrupted planet is a planet or exoplanet or, perhaps on a somewhat smaller scale, a planetary-mass object, planetesimal, moon, exomoon
Disrupted_planet
Types of planet by chemical mass
Constantinou, Savvas; et al. (2023-10-01). "Carbon-bearing Molecules in a Possible Hycean Atmosphere". The Astrophysical Journal Letters. 956 (1): L13. arXiv:2309
List_of_planet_types
Star in the constellation Cetus
LHS 1140 is known to have two planets orbiting it. The inner planet is LHS 1140 c, a hot rocky planet; the outer planet, which was the first to be discovered
LHS_1140
Red dwarf star in the constellation Leo
predictions for a hycean planet. A second, non-transiting planet, K2-18c, was discovered in 2017 by radial velocity with HARPS. This planet was challenged
K2-18
Chemical compound of hydrogen and oxygen
quantities. The state of water on a planet depends on ambient pressure, which is determined by the planet's gravity. If a planet is sufficiently massive, the
Water
Super-Earth ice exoplanet
one of the most distant planets known. On January 25, 2006, Probing Lensing Anomalies NETwork/Robotic Telescope Network (PLANET/Robonet), Optical Gravitational
OGLE-2005-BLG-390Lb
Known extent to which a planet is suitable for life
habitable planets, named ocean planets, which involves "hot, ocean-covered planets with hydrogen-rich atmospheres", has been reported. Hycean planets may soon
Planetary_habitability
Planet smaller than Neptune with a low density envelope
form a liquid ocean below a hydrogen-dominated atmosphere, becoming a hycean planet. Spectroscopic characterization has been performed on a number of sub-Neptunes
Sub-Neptune
Mission PEGASE Darwin EChO Eddington Space Interferometry Mission Terrestrial Planet Finder "Mt. Hamilton Telescopes: Carnegie Double Astrograph". www.ucolick
List of exoplanet search projects
List_of_exoplanet_search_projects
Accumulation of matter around a star
Around the youngest stars, they are the reservoirs of material out of which planets may form. Around mature stars, they indicate that planetesimal formation
Circumstellar_disc
Topics referred to by the same term
Ocean world Hycean planet, planet covered in water with a hydrogen atmosphere -- an ocean planet with hydrogen atmosphere Lava planet, planet covered in
Ocean_(disambiguation)
Extrasolar planet in the constellation Cancer
It is also possible that 55 Cancri Af is a "temperate ice giant" or hycean planet due to its orbit and possible hydrogen-rich composition. It is not known
55_Cancri_Af
Hypothesis that complex extraterrestrial life is improbable and extremely rare
The chemical composition of a planet can affect the redox conditions at the planet's surface; for example, Hycean planets would have extremely reducing
Rare_Earth_hypothesis
Topics referred to by the same term
Napa), Cyprus Ocean world, a hypothetical type of planet completely covered in water Hycean planet, an astronomical body covered in water with a hydrogen
Water_World
Earth-size exoplanet orbiting Kepler-1649
within the habitable zone of the red dwarf star Kepler-1649, the outermost planet of the planetary system discovered by Kepler’s space telescope. It is located
Kepler-1649c
Large planet orbiting close to a star
Neptunes are rare Ocean world – Planet containing a significant amount of water or other liquid Hycean planet – Water-covered planet with a hydrogen-rich atmosphere
Hot_Neptune
Topics referred to by the same term
world, an astronomical body possessing a significant amount of water Hycean planet, an astronomical body covered in water with a hydrogen atmosphere Oceanworld
Ocean_World
Steam whose temperature can be decreased without immediately condensing
Extraterrestrial liquid water Asteroidal water Planetary oceanography Ocean world Hycean planet List of Candidates Specific Europa Mars Moon Enceladus Physical parameters
Superheated_steam
Physical and chemical properties of pure water
melting points, such as methane and ammonia). In the inner Solar System, planets, asteroids, and moons formed almost entirely of metals and silicates. Water
Properties_of_water
Exoplanet in TOI-2136 star system
position near the red dwarf for planets predicted by atmospheric mass-loss models and for its potential as a hycean world. TOI-2136 b was first identified
TOI-2136_b
Extrasolar planet
51 Eridani b is a "Jupiter-like" planet that orbits the young F0 V star 51 Eridani, in the constellation Eridanus. It is 96 light-years (29 parsecs) away
51_Eridani_b
Topics referred to by the same term
amount of water Hycean planet, an astronomical body covered in water with a hydrogen atmosphere Hydrosphere, planetary water, a planet's water Earth, sometimes
Water_planet
Small particles between exoplanets
show the dynamical influence of extrasolar planets, and potentially indicate the presence of these planets. Because it is often located near a star's
Exozodiacal_dust
Water safe for consumption
Extraterrestrial liquid water Asteroidal water Planetary oceanography Ocean world Hycean planet List of Candidates Specific Europa Mars Moon Enceladus Physical parameters
Drinking_water
Accumulation of matter around a planet
dust, planetesimals, asteroids or collision fragments in orbit around a planet. They are reservoirs of material out of which moons (or exomoons or subsatellites)
Circumplanetary_disk
Planetary mass companion orbiting GU Piscium
(3.0×1011 km), and an apparent angular separation of 42 arc seconds. The planet is located at right ascension 01h 12m 36.48s declination +17° 04′ 31.8″
GU_Piscium_b
Frigid super-Earth orbiting OGLE-2016-BLG-1195L
OGLE-2016-BLG-1195Lb is an extrasolar planet located about 22,000 light-years from Earth, in the galactic bulge, orbiting the 0.57±0.06 M☉ star OGLE-2016-BLG-1195L
OGLE-2016-BLG-1195Lb
American astronomer
Kepler spacecraft mission prior to its finding of significant quantities of planets around other stars. Ballard has spoken about her experience as a victim
Sarah_Ballard
Circumbinary gas giant orbiting the Kepler-1647 star system
transit of the planet was identified in 2012, but at the time the single event was not enough to rule out contamination, or confirm it as a planet. It was discovered
Kepler-1647b
Exosolar object orbiting OGLE-2016-BLG-1190L
discovered lying near the planet/brown dwarf boundary. In addition, the discovery "is likely to be the first Spitzer microlensing planet in the Galactic bulge/bar
OGLE-2016-BLG-1190Lb
Area of astronomical research
Moses, Julianne I. (2023-10-01). "Carbon-bearing Molecules in a Possible Hycean Atmosphere". The Astrophysical Journal. 956 (1): L13. arXiv:2309.05566.
Extraterrestrial_atmosphere
6 times the mass of Earth. Webb's data suggests that it might be a hycean planet covered in oceans of water, with a hydrogen-rich atmosphere. 14 September
2023_in_science
habitable exoplanets, named hycean planets (from hydrogen and ocean), which are described as hot, water-covered planets with a hydrogen-rich atmosphere
2021_in_science
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