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K2-66b is a confirmed[2][3] mega-Earth orbiting the subgiant K2-66, about 520 parsecs (1,700 ly) form Earth in the direction of Aquarius.[1] It is an extremely hot and dense planet heavier than Neptune, but with only about half its radius.[4]

K2-66b
Discovery[1]
Discovered byK2
Discovery date2017
Detection method
Transit
Orbital characteristics[1]
Semi-major axis
0.05983±0.00072 AU
Orbital period (sidereal)
5.06963±0.00081 d
Inclination86.6+4.4
−2.4°
StarK2-66
Physical characteristics[1]
Mean radius
2.49 REarth
Mass0.06702 MJ
Mean density
7.6 g/cm3

    Planet properties



    Mass, radius, and temperature


    K2-66b is a mega-Earth with radius 2.49 REarth and mass 21.3 MEarth.[5] The planet's temperature is highly variable due to the variability of its host star, and is currently estimated at 1,372 K (1,099 °C; 2,010 °F).[2]


    Orbit


    The planet orbits every 5.07 days at 0.06 AU.[1] It orbits within a "photoevaporation desert", where orbiting exoplanets should be very uncommon.[4][6] K2-66b's orbit is nearly circular.[2][7]


    Star


    The star,[8] K2-66 is a G1 sub-giant in Aquarius.[5] It has a sun-like temperature of 5887 K,[1][2] which corresponds to its spectral class and is very close to that of the rotationally variable[9] star Kepler-130.[10][11][12] It has a radius of 1.67 R☉ and a mass of 1.11 M☉.[2] Its metallicity is −0.047, and its apparent magnitude is 11.71.[1]


    See also



    References


    1. "The Extrasolar Planet Encyclopaedia — K2-66 b". exoplanet.eu. Retrieved 30 January 2021.
    2. "Open Exoplanet Catalogue - K2-66 b". openexoplanetcatalogue.com. Retrieved 26 June 2021.
    3. "K2-66 - Universe Guide". www.universeguide.com. Retrieved 7 July 2021.
    4. Sinukoff, Evan; Howard, Andrew W.; Petigura, Erik A.; Fulton, Benjamin J.; Crossfield, Ian J. M.; Isaacson, Howard; Gonzales, Erica; Crepp, Justin R.; Brewer, John M.; Hirsch, Lea; Weiss, Lauren M.; Ciardi, David R.; Schlieder, Joshua E.; Benneke, Bjoern; Christiansen, Jessie L.; Dressing, Courtney D.; Hansen, Brad M. S.; Knutson, Heather A.; Kosiarek, Molly; Livingston, John H.; Greene, Thomas P.; Rogers, Leslie A.; Lépine, Sébastien (2017). "K2-66b and K2-106b: Two Extremely Hot Sub-Neptune-size Planets with High Densities". The Astronomical Journal. 153 (6): 271. arXiv:1705.03491. Bibcode:2017AJ....153..271S. doi:10.3847/1538-3881/aa725f. S2CID 31572527.
    5. Futó, P. (2018). Kepler-145b and K2-66b: A Kepler- and a K2-Mega-Earth with Different Compositional Characteristics. Lunar and Planetary Science Conference. No. 2083. p. 1224. Bibcode:2018LPI....49.1224F.
    6. "K2-66b and K2-106b: Two Extremely Hot Sub-Neptune-size Planets with High Densities | Request PDF". ResearchGate. Retrieved 29 June 2021.
    7. "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 25 June 2021.
    8. "K2-66". sim-id. Retrieved 7 July 2021. {{cite web}}: Check |url= value (help)
    9. "Kepler-130". sim-id. Retrieved 7 July 2021. {{cite web}}: Check |url= value (help)
    10. "Kepler-130 | NASA Exoplanet Archive".{{cite web}}: CS1 maint: url-status (link)
    11. "The Extrasolar Planet Encyclopaedia — Kepler-130 d". exoplanet.eu. Retrieved 28 June 2021.
    12. "Open Exoplanet Catalogue - Kepler-130 d". www.openexoplanetcatalogue.com. Retrieved 28 June 2021.




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