K2-296b
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 Size comparison of the planet K2-296b (artistic concept) with Earth | |
| Discovery[1] | |
|---|---|
| Discovered by | René Heller et al. |
| Discovery date | 2019 |
| Transit method | |
| Designations | |
| EPIC 201238110 b, TIC 35019000 b, UCAC4 434-056021 b[2] | |
| Orbital characteristics[3] | |
| 0.135 | |
| 28.1696+0.0043 −0.0038 [4] | |
| Inclination | 89.8° |
| Star | EPIC 201238110 |
| Physical characteristics[1] | |
| 0.167+0.018 −0.04 RJ | |
| Mass | ~4.2 ME[3] |
| Temperature | 277 K (4 °C; 39 °F, equilibrium)[3] |
K2-296b (more commonly referred to as EPIC 201238110 b) is a potentially habitable[3] planet discovered by Heller et al.[5] in 2019, orbiting the M-dwarf star[6] EPIC 201238110.
Habitability
[edit]K2-296b's orbit, which has a semi-major axis of 0.135 AU (20,200,000 km),[3] is located in the habitable zone of the planetary system, meaning liquid water could exist on its surface.[6] Its equilibrium temperature is estimated at 277 K (4 °C; 39 °F).[3] The planet is likely tidally locked to its parent star.[6] 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.[3]
Host star
[edit]The host star, EPIC 201238110, is a red dwarf with a mass of 0.41 M☉[6] and a radius of 0.37 R☉.[3] It has a surface temperature of 3588 K[7] or 3772 K,[3] and a luminosity of 0.0254 L☉.[3] There is another transiting[5] 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).[3]
References
[edit]- ^ a b "The Extrasolar Planet Encyclopaedia — EPIC 201238110 b". Extrasolar Planets Encyclopaedia. Retrieved 2021-04-15.
- ^ "K2-296". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-07-19.
- ^ a b c d e f g h i j k "plot_K2-296.png". Planetary Habitability Laboratory. 2019-09-03.
- ^ 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.
- ^ a b "EPIC 201238110 Overview". NASA Exoplanet Archive. Retrieved 2024-07-19.
- ^ a b c d 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.
- ^ 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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