Astronomy:K2-66b

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Short description: Mega-Earth exoplanet orbiting K2-66
K2-66b
Discovery[1]
Discovered byK2
Discovery date2017
Transit
Orbital characteristics[1]
0.05983±0.00072 AU
Orbital period5.06963±0.00081 d
Inclination86.6+4.4
−2.4°
StarK2-66
Physical characteristics[1]
Mean radius2.49 R⊕
Mass0.06702 MJ
Mean density7.6 g/cm3


K2-66b is a confirmed[2][3] mega-Earth orbiting the subgiant K2-66, about 520 parsecs (1,700 ly) from 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]

Planet properties

Mass, radius, and temperature

K2-66b is a mega-Earth with radius 2.49 R⊕ and mass 21.3 M⊕.[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 variableCite error: Closing </ref> missing for <ref> tag[9][10] 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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "The Extrasolar Planet Encyclopaedia — K2-66 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/k2_66_b--6576/. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 "Open Exoplanet Catalogue - K2-66 b". http://openexoplanetcatalogue.com/planet/K2-66%20b/. 
  3. ↑ "K2-66 - Universe Guide". https://www.universeguide.com/star/124622/k266. 
  4. ↑ 4.0 4.1 Sinukoff, Evan; Howard, Andrew W.; Petigura, Erik A.; Fulton, Benjamin J.; Crossfield, Ian J. M.; Isaacson, Howard; Gonzales, Erica; Crepp, Justin R. et al. (2017). "K2-66b and K2-106b: Two Extremely Hot Sub-Neptune-size Planets with High Densities". The Astronomical Journal 153 (6): 271. doi:10.3847/1538-3881/aa725f. Bibcode: 2017AJ....153..271S. 
  5. ↑ 5.0 5.1 Futó, P. (2018). "Kepler-145b and K2-66b: A Kepler- and a K2-Mega-Earth with Different Compositional Characteristics". 1224. Bibcode: 2018LPI....49.1224F. 
  6. ↑ Sinukoff, Evan et al. (31 May 2017). "K2-66b and K2-106b: Two Extremely Hot Sub-Neptune-size Planets with High Densities". The Astronomical Journal 153 (6): 271. doi:10.3847/1538-3881/aa725f. Bibcode: 2017AJ....153..271S. 
  7. ↑ "Exoplanet-catalog". https://exoplanets.nasa.gov/exoplanet-catalog/3334/k2-66-b/. 
  8. ↑ "K2-66". http://sim-id/. 
  9. ↑ "The Extrasolar Planet Encyclopaedia — Kepler-130 d". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/kepler_130_d--2115/. 
  10. ↑ "Open Exoplanet Catalogue - Kepler-130 d". http://www.openexoplanetcatalogue.com/planet/Kepler-130%20d/. 

External links



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