Astronomy:Kepler-84

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Kepler-84 is a Sun-like star 3,339 light-years from the Sun.[1] It is a G-type star. The stellar radius measurement has a large uncertainty of 48% as in 2017, complicating the modelling of the star.[2] The Kepler-84 star has two suspected stellar companions. Four stars, all more than four magnitudes fainter than Kepler-84, are seen within a few arcseconds and at least one is probably gravitationally bound to Kepler-84.[3] Another, which has only a 0.005% chance of being a background star, is a yellow star with mass 0.855 M☉ at a projected separation of 0.18±0.05″ or 0.26″ (213.6 AU).[4]

Planetary system

Kepler-84 is orbited by five known planets, four small gas giants and a Super-Earth. Planets Kepler-84b and Kepler-84c were confirmed in 2012[5] while the rest was confirmed in 2014.[6] To keep the known planetary system stable, no additional giant planets can be located within 7.4 AU from the parent stars.[7]

The Kepler-84 planetary system[8][9][10][11]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.126±0.038 MJ 0.083 8.725854±0.00006 0 88.24° 0.174±0.045 RJ
c 0.064±0.037 MJ 0.108 12.882525±0.000093 0 88.24° 0.184±0.047 RJ
d — 0.052 4.224537±0.000042 — — 0.123±0.024 RJ
e — 0.181 27.434389±0.000224 — — 0.232±0.044 RJ
f — 0.25 44.552169±0.000812 — — 0.196±0.038 RJ

References

  1. ↑ "Kepler-84 b - NASA Science" (in en-US). 16 March 2016. https://science.nasa.gov/exoplanet-catalog/kepler-84-b/. 
  2. ↑ Ramos, X. S.; Charalambous, C.; Benítez-Llambay, P.; Beaugé, C. (2017), "Planetary migration and the origin of the 2:1 and 3:2 (near)-resonant population of close-in exoplanets", Astronomy & Astrophysics 602: A101, doi:10.1051/0004-6361/201629642, Bibcode: 2017A&A...602A.101R 
  3. ↑ Hirsch, Lea A.; Ciardi, David R.; Howard, Andrew W.; Everett, Mark E.; Furlan, Elise; Saylors, Mindy; Horch, Elliott P.; Howell, Steve B. et al. (2017), "Assessing the Effect of Stellar Companions from High-resolution Imaging of Kepler Objects of Interest", The Astronomical Journal 153 (3): 117, doi:10.3847/1538-3881/153/3/117, Bibcode: 2017AJ....153..117H 
  4. ↑ Kraus, Adam L.; Ireland, Michael J.; Huber, Daniel; Mann, Andrew W.; Dupuy, Trent J. (2016), "The Impact of Stellar Multiplicity on Planetary Systems. I. The Ruinous Influence of Close Binary Companions", The Astronomical Journal 152 (1): 8, doi:10.3847/0004-6256/152/1/8, Bibcode: 2016AJ....152....8K 
  5. ↑ Xie, Ji-Wei (2012), "Transit Timing Variation of Near-Resonance Planetary Pairs: Confirmation of 12 Multiple-Planet Systems", The Astrophysical Journal Supplement Series 208 (2): 22, doi:10.1088/0067-0049/208/2/22, Bibcode: 2013ApJS..208...22X 
  6. ↑ openexoplanetcatalogue.com Kepler-84
  7. ↑ Becker, Juliette C.; Adams, Fred C. (2017), "Effects of Unseen Additional Planetary Perturbers on Compact Extrasolar Planetary Systems", Monthly Notices of the Royal Astronomical Society 468 (1): 549–563, doi:10.1093/mnras/stx461, Bibcode: 2017MNRAS.468..549B 
  8. ↑ 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 
  9. ↑ Planet Kepler-84 d at exoplanets.eu
  10. ↑ Planet Kepler-84 e at exoplanets.eu
  11. ↑ Planet Kepler-84 f at exoplanets.eu

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