Astronomy:K2-3
K2-3, also known as EPIC 201367065,[1] is a red dwarf star with three known planets. It is on the borderline of being a late orange dwarf/K-type star, but because of its temperature, it is classified as a red dwarf (4,000 K is typically the division line between spectral class M and K).
At a distance of 143 light-years (44 parsecs),[2] the star's proximity means it is bright enough to make it feasible for astronomers to study the planets' atmospheres to determine whether they are like Earth's atmosphere and possibly conducive to life.
Planetary system
K2-3 has three confirmed exoplanets, discovered in 2015.[3] All are low-density super-Earths or sub-Neptunes, with the outermost orbiting near the inner edge of the habitable zone.[4][5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 5.11+0.65 −0.64 M⊕ |
0.0778±0.0026 | 10.054626(0) | <0.094 | 89.588+0.12 −0.100° |
2.078+0.076 −0.067 R⊕ |
| c | 2.68±0.85 M⊕ | 0.1414±0.0047 | 24.646582(39) | <0.095 | 89.905+0.066 −0.088° |
1.582+0.057 −0.051 R⊕ |
| d | <1.6 M⊕ | 0.2097±0.0070 | 44.556456(97) | <0.097 | 89.788+0.033 −0.029° |
1.458+0.056 −0.051 R⊕ |
References
- ↑ "K2-3". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-3.
- ↑ 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.
- ↑ Crossfield, Ian J. M. et al. (2015). "A Nearby M Star with Three Transiting Super-Earths Discovered by K2". The Astrophysical Journal 804 (1). doi:10.1088/0004-637X/804/1/10. Bibcode: 2015ApJ...804...10C.
- ↑ Damasso, M. et al. (2018). "Eyes on K2-3: A system of three likely sub-Neptunes characterized with HARPS-N and HARPS". Astronomy & Astrophysics 615. doi:10.1051/0004-6361/201732459. Bibcode: 2018A&A...615A..69D.
- ↑ 5.0 5.1 Diamond-Lowe, Hannah et al. (2022-11-01). "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). doi:10.3847/1538-3881/ac7807. Bibcode: 2022AJ....164..172D.
- ↑ Bonomo, A. S. et al. (2023). "Cold Jupiters and improved masses in 38 Kepler and K2 small planet systems from 3661 HARPS-N radial velocities: No excess of cold Jupiters in small planet systems". Astronomy & Astrophysics 677. doi:10.1051/0004-6361/202346211. Bibcode: 2023A&A...677A..33B.
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