| Discovery | |
|---|---|
| Discovery date | December 2019 |
| Detection method | radial velocity and transit |
| Designations | |
| Alternative names | K2-313 b |
| Orbital characteristics | |
| Semi-major axis | 0.04180±0.00064 AU |
| Eccentricity | 0 |
| Orbital period (sidereal) | 5.7459982(20) d |
| Inclination | 89.03°±0.10° |
| Physical characteristics | |
| Mean radius | 1.900±0.065 R🜨 |
| Mass | 4.00±0.63 M🜨 |
| Mean density | 3.20+0.63 −0.58 g/cm |
| Surface gravity | 10.8±1.8 m/s |
| Temperature | 440.6±7.6 K (167.5 °C; 333.4 °F, equilibrium) |
G 9-40 b is a sub-Neptune exoplanet that has an orbital period of 5.7 days. The host star is a red dwarf located 91 light-years (28 parsecs) away from Earth in the constellation Cancer. The planet was discovered in 2019. The planet's density is too low for a rocky composition, suggesting that it is either water-rich or has a significant hydrogen atmosphere.
See also
References
- Stefánsson, Guðmundur; et al. (2019), "A sub-Neptune sized planet transiting the M2.5-dwarf G 9-40: Validation with the Habitable-zone Planet Finder", The Astronomical Journal, 159 (3): 100, arXiv:1912.00291, Bibcode:2020AJ....159..100S, doi:10.3847/1538-3881/ab5f15, S2CID 208526899
- "G 9-40 b Overview". NASA Exoplanet Archive. Retrieved 15 June 2024.
- ^ Luque, R.; et al. (2022), "Precise mass determination for the keystone sub-Neptune planet transiting the mid-type M dwarf G 9-40", Astronomy & Astrophysics, 666: A154, arXiv:2208.07287, Bibcode:2022A&A...666A.154L, doi:10.1051/0004-6361/202244426, S2CID 251564548
- Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 2021-03-23.
- "The Extrasolar Planet Encyclopaedia — G 9-40 b". Extrasolar Planets Encyclopaedia. Retrieved 28 March 2021.
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