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K2-296b

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Exoplanet Not to be confused with Kepler-296b.
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K2-296b
Size comparison of the planet K2-296b (artistic concept) with Earth
Discovery
Discovered byRené Heller et al.
Discovery date2019
Detection methodTransit method
Designations
Alternative namesEPIC 201238110 b, TIC 35019000 b, UCAC4 434-056021 b
Orbital characteristics
Semi-major axis0.135
Orbital period (sidereal)28.1696+0.0043
−0.0038
Inclination89.8°
StarEPIC 201238110
Physical characteristics
Mean radius0.167+0.018
−0.04 RJ
Mass~4.2 ME
Temperature277 K (4 °C; 39 °F, equilibrium)

K2-296b (more commonly referred to as EPIC 201238110 b) is a potentially habitable planet discovered by Heller et al. in 2019, orbiting the M-dwarf star EPIC 201238110.

Habitability

K2-296b's orbit, which has a semi-major axis of 0.135 AU (20,200,000 km), is located in the habitable zone of the planetary system, meaning liquid water could exist on its surface. Its equilibrium temperature is estimated at 277 K (4 °C; 39 °F). The planet is likely tidally locked to its parent star. The Habitable Worlds Catalog, issued by the Planetary Habitability Laboratory, classes the planet as a warm superterran, near the inner edge of the optimistic habitable zone.

Host star

The host star, EPIC 201238110, is a red dwarf with a mass of 0.41 M☉ and a radius of 0.37 R☉. It has a surface temperature of 3588 K or 3772 K, and a luminosity of 0.0254 L☉. There is another transiting candidate planet in the system called EPIC 201238110 c, which, if confirmed, would be a hot (427 K) mini-Neptune with a radius of 2.76 R🜨 and a mass of 8.0 ME, revolving around the star once every 7.9 days at a distance of 0.058 AU (8,700,000 km).

References

  1. ^ "The Extrasolar Planet Encyclopaedia — EPIC 201238110 b". Extrasolar Planets Encyclopaedia. Retrieved 2021-04-15.
  2. "K2-296". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-07-19.
  3. ^ "plot_K2-296.png". Planetary Habitability Laboratory. 2019-09-03.
  4. Hardegree-Ullman, Kevin K. (2020-03-10). "Scaling K2. I. Revised Parameters for 222,088 K2 Stars and a K2 Planet Radius Valley at 1.9 R⊕". The Astrophysical Journal Supplement. 247 (28): 28. arXiv:2001.11511. Bibcode:2020ApJS..247...28H. doi:10.3847/1538-4365/ab7230. S2CID 211003631.
  5. ^ "EPIC 201238110 Overview". NASA Exoplanet Archive. Retrieved 2024-07-19.
  6. ^ Heller, René; Hippke, Michael; Rodenbeck, Kai (July 2019). "Transit least-squares survey -- II. Discovery and validation of 17 new sub- to super-Earth-sized planets in multi-planet systems from K2". Astronomy and Astrophysics. 627. arXiv:1905.09038. doi:10.1051/0004-6361/201935600.
  7. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
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