K2-3b, also known as EPIC 201367065 b, is an exoplanet orbiting the red dwarf K2-3 every 10 days.[3][4] It is the largest and most massive planet of the K2-3 system, with about 2.1 times the radius of Earth and about 5 times the mass.[2] Its density of about 3.1 g/cm3 may indicate a composition of almost entirely water, or a hydrogen envelope comprising about 0.7% of the planet's mass.[5]
| Discovery[1] | |
|---|---|
| Discovery site | Kepler Space Observatory |
| Discovery date | 2015 |
| Transit | |
| Orbital characteristics[2] | |
| 0.0747+0.0013 −0.0012 AU | |
| Eccentricity | 0.107+0.057 −0.059 |
| 10.0546535+0.0000088 −0.0000091 d | |
| Inclination | 89.40°+0.34° −0.22° |
| 188°+32° −34° | |
| Semi-amplitude | 2.27±0.28 m/s |
| Star | K2-3 |
| Physical characteristics[2] | |
| 2.078+0.076 −0.067 R🜨 | |
| Mass | 5.11+0.65 −0.64 M🜨 |
Mean density | 3.11+0.49 −0.46 g/cm3 |
| Temperature | 501.3+5.1 −5.2 K (228.2 °C; 442.7 °F, equilibrium) |
References
edit- ^ Crossfield, Ian J. M.; et al. (2015). "A Nearby M Star with Three Transiting Super-Earths Discovered by K2". The Astrophysical Journal. 804 (1) 10. arXiv:1501.03798. Bibcode:2015ApJ...804...10C. doi:10.1088/0004-637X/804/1/10.
- ^ a b c Diamond-Lowe, Hannah; Kreidberg, Laura; Harman, C. E.; Kempton, Eliza M.-R.; Rogers, Leslie A.; Joyce, Simon R. G.; Eastman, Jason D.; King, George W.; Kopparapu, Ravi; Youngblood, Allison; Kosiarek, Molly R.; Livingston, John H.; Hardegree-Ullman, Kevin K.; Crossfield, Ian J. M. (2022), "The K2-3 System Revisited: Testing Photoevaporation and Core-powered Mass Loss with Three Small Planets Spanning the Radius Valley", The Astronomical Journal, 164 (5): 172, arXiv:2207.12755, Bibcode:2022AJ....164..172D, doi:10.3847/1538-3881/ac7807, S2CID 251067119
- ^ "K2-3 b CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-17.
- ^ "The Extrasolar Planet Encyclopaedia — K2-3 B". Extrasolar Planets Encyclopaedia.
- ^ Damasso, Mario; et al. (2018). "Eyes on K2-3: A system of three likely sub-Neptunes characterized with HARPS-N and HARPS". Astronomy and Astrophysics. 615. A69. arXiv:1802.08320. Bibcode:2018A&A...615A..69D. doi:10.1051/0004-6361/201732459. S2CID 58923147.
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