K2-3b

K2-3b

Discovery [1]
Discovery site	Kepler Space Observatory
Discovery date	2015
Detection method	Transit
Orbital characteristics [2]
Semi-major axis	0.0747+0.0013 −0.0012  AU
Eccentricity	0.107+0.057 −0.059
Orbital period (sidereal)	10.0546535+0.0000088 −0.0000091  d
Inclination	89.40°+0.34° −0.22°
Argument of periastron	188°+32° −34°
Semi-amplitude	2.27±0.28  m/s
Star	K2-3
Physical characteristics [2]
Mean radius	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)

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]

References

1. 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 .
2. 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) 172. arXiv: 2207.12755 . Bibcode: 2022AJ....164..172D . doi: 10.3847/1538-3881/ac7807 .
3. "K2-3 b CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-17.
4. "The Extrasolar Planet Encyclopaedia — K2-3 b". Extrasolar Planets Encyclopaedia .
5. 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 A69. arXiv: 1802.08320 . Bibcode: 2018A&A...615A..69D . doi: 10.1051/0004-6361/201732459 .