hycean
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English
Etymology
Pronunciation
Adjective
hycean (not comparable)
- (astronomy, planetology, of a planet, neologism) Having a water-based ocean that covers the entire planet, and an atmosphere rich in hydrogen.
- 2021 August, Nikku Madhusudhan, Anjali A. A. Piette, Savvas Constantinou, “Habitability and Biosignatures of Hycean Worlds”, in Astrophysical Journal:
- With densities between those of rocky super-Earths and more extended mini-Neptunes, Hycean planets can be optimal candidates in the search for exoplanetary habitability and may be abundant in the exoplanet population.
- 2021 August 25, Jamie Carter, “Is Alien Life Hiding In Plain Sight? New Class Of 'Hycean' Planet Is Where We Should Look, Say Scientists”, in Forbes:
- It's thought that the new classification could accelerate the search for life outside our Solar System for one simple reason: planets that fulfil the criteria to be "Hycean" already dominate the known exoplanet population, which is approaching 4,500.
- 2021 August 26, Ashley Strickland, CNN:
- And learning more about Hycean planets could help scientists find biosignatures, or signs of life, outside of our solar system in the near future.
- 2021 September 2, Joshua Colwell, Adrienne Dove, James Cooney, “Hycean Worlds and Nudging Asteroids”, in Walkabout the Galaxy:
- These hydrogen-rich ocean worlds, or hycean worlds, may be habitable.
- 2022 February 21, K KawauchiF MurgasE PalleN NaritaA Fukuiet al., “Validation and atmospheric exploration of the sub-Neptune TOI-2136b around a nearby M3 dwarf”, in arXiv.org, :
- TOI-2136b is a sub-Neptune transiting a nearby and bright star (J=10.8) and is a potential hycean planet, making it an excellent target for atmospheric studies to understand the formation, evolution, and habitability of the small planets.
- 2022 September 26, Caprice Phillips, Ji Wang, Billy Edwards, Romy Rodriguez Martinez, Anusha Pai Asnodkar, B. Scott Gaudi, “Is LTT 1445 Ab a Hycean World or a cold Haber World? Exploring the Potential of Twinkle to Unveil Its Nature”, in arXiv, :
- While LTT 1445 Ab is not in the traditional habitable zone of its star (Winters et al. 2019), it is considered as a candidate Hycean world where a liquid ocean may exist underneath a H2-dominated atmosphere.
Usage notes
Sometimes unnecessarily capitalised, possibly reflecting a false assumption about the etymology.
See also
Further reading
Ocean world on Wikipedia.Wikipedia
