Astronomy:Kepler-27

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Kepler-27 is a star in the northern constellation of Cygnus, the swan. It is located at the celestial coordinates: Right Ascension  19h 28m 56.81962s, Declination +41° 05′ 09.1405″.[1] With an apparent visual magnitude of 15.855,[2] this star is too faint to be seen with the naked eye. In 2024, Kepler-27 was discovered to be a binary star with a red dwarf companion 1.975 arcseconds away.[3]

Planetary system

The planetary system of Kepler-27 comprising two small gas giants on eccentric orbits[4] was discovered in late 2011.[5] The planets Kepler-27b and Kepler-27c have equilibrium temperatures of 610 K and 481 K, respectively.[6] In 2021, a third, sub-Neptune-sized planet was confirmed, orbiting closer in than the other two planets.[7][8]

The Kepler-27 planetary system[6][8]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
d — — 6.54629 — — 0.2414 RJ
b 0.1320±0.018 MJ 0.118 15.3348 — — 0.522±0.024 RJ
c 0.0670±0.011 MJ 0.191 31.3309 — — 0.640±0.029 RJ

References

  1. ↑ 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.
  2. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named nasa_ames
  3. ↑ Sullivan, Kendall; Kraus, Adam L.; Berger, Travis A. et al. (2024). "Revising Properties of Planet–Host Binary Systems. IV. The Radius Distribution of Small Planets in Binary Star Systems Is Dependent on Stellar Separation". The Astronomical Journal 168 (3): 14. doi:10.3847/1538-3881/ad6310. 129. Bibcode: 2024AJ....168..129S. 
  4. ↑ Hadden, Sam; Lithwick, Yoram (2017), "Kepler Planet Masses and Eccentricities from TTV Analysis", The Astronomical Journal 154 (1): 5, doi:10.3847/1538-3881/aa71ef, Bibcode: 2017AJ....154....5H 
  5. ↑ Steffen, Jason H.; Fabrycky, Daniel C.; Ford, Eric B.; Carter, Joshua A.; Desert, Jean-Michel; Fressin, Francois; Holman, Matthew J.; Lissauer, Jack J. et al. (2012), "Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations", Monthly Notices of the Royal Astronomical Society 421 (3): 2342, doi:10.1111/j.1365-2966.2012.20467.x, Bibcode: 2012MNRAS.421.2342S 
  6. ↑ 6.0 6.1 Furlan, E.; Howell, S. B. (2017), "The Densities of Planets in Multiple Stellar Systems", The Astronomical Journal 154 (2): 66, doi:10.3847/1538-3881/aa7b70, Bibcode: 2017AJ....154...66F 
  7. ↑ Valizadegan, Hamed; Martinho, Miguel J. S. (February 2022). "ExoMiner: A Highly Accurate and Explainable Deep Learning Classifier That Validates 301 New Exoplanets". The Astrophysical Journal 926 (2): 120. doi:10.3847/1538-4357/ac4399. Bibcode: 2022ApJ...926..120V. 
  8. ↑ 8.0 8.1 "Kepler-27". https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-27. Retrieved 7 November 2022. 

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Coordinates: Sky map 19h 28m 56.825s, +41° 05′ 09.15″



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