Astronomy:G 9-40 b
From HandWiki
| Discovery[1] | |
|---|---|
| Discovery date | December 2019 |
| radial velocity and transit | |
| Designations | |
| K2-313 b[2] | |
| Orbital characteristics[3] | |
| 0.04180±0.00064 astronomical unit|AU | |
| Eccentricity | 0 |
| Orbital period | 5.7459982(20) d |
| Inclination | 89.03°±0.10° |
| Physical characteristics[3] | |
| Mean radius | 1.900±0.065 R🜨 |
| Mass | 4.00±0.63 M🜨 |
| Mean density | 3.20+0.63 −0.58 g/cm3 |
| 10.8±1.8 m/s2 | |
| Physics | 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.[4] The planet was discovered in 2019.[5][6] The planet's density is too low for a rocky composition, suggesting that it is either water-rich or has a significant hydrogen atmosphere.[3]
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, doi:10.3847/1538-3881/ab5f15, Bibcode: 2020AJ....159..100S
- ↑ "G 9-40 b Overview". NASA Exoplanet Archive. https://exoplanetarchive.ipac.caltech.edu/overview/G%209-40%20b.
- ↑ 3.0 3.1 3.2 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, doi:10.1051/0004-6361/202244426, Bibcode: 2022A&A...666A.154L
- ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ "Exoplanet-catalog". https://exoplanets.nasa.gov/exoplanet-catalog/7545/g-9-40-b/.
- ↑ "The Extrasolar Planet Encyclopaedia — G 9-40 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/g_9_40_b--7229/.
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