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Kepler-84

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Kepler-84
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus[1]
Right ascension 19h 53m 00.48519s[2]
Declination +40° 29′ 45.9477″[2]
Apparent magnitude (V) 15.03[3]
Characteristics
Astrometry
Proper motion (μ) RA: −0.150 mas/yr[2]
Dec.: −2.872 mas/yr[2]
Parallax (π)0.6929±0.7043 mas[2]
Distance1,066[4] pc
Details
Other designations
Kepler-84, KOI-1589, KIC 5301750, 2MASS J19530049+4029458[5]
Database references
SIMBADdata
Exoplanet Archivedata

Kepler-84 is a Sun-like star 3,339 light-years from the Sun.[6] 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.[7] 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.[8] 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).[9]

Planetary system

[edit]

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[10] while the rest was confirmed in 2014.[11] To keep the known planetary system stable, no additional giant planets can be located within 7.4 AU from the parent stars.[12]

The Kepler-84 planetary system[13][14][15][16]
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

[edit]
  1. ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ Sousa, S. G.; Adibekyan, V.; Delgado-Mena, E.; Santos, N. C.; Rojas-Ayala, B.; Barros, S. C. C.; Demangeon, O. D. S.; Hoyer, S.; Israelian, G.; Mortier, A.; Soares, B. M. T. B.; Tsantaki, M. (2024). "SWEET-Cat: A view on the planetary mass-radius relation". Astronomy and Astrophysics. 691: A53. arXiv:2409.11965. Bibcode:2024A&A...691A..53S. doi:10.1051/0004-6361/202451704.
  4. ^ Morton, Timothy D.; Bryson, Stephen T.; Coughlin, Jeffrey L.; Rowe, Jason F.; Ravichandran, Ganesh; Petigura, Erik A.; Haas, Michael R.; Batalha, Natalie M. (2016). "False Positive Probabilities for all Kepler Objects of Interest: 1284 Newly Validated Planets and 428 Likely False Positives". The Astrophysical Journal. 822 (2): 86. arXiv:1605.02825. Bibcode:2016ApJ...822...86M. doi:10.3847/0004-637X/822/2/86.
  5. ^ "Kepler-84". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 13, 2016.
  6. ^ "Kepler-84 b - NASA Science". science.nasa.gov. 16 March 2016. Retrieved 2024-09-13.
  7. ^ 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, arXiv:1704.06459, Bibcode:2017A&A...602A.101R, doi:10.1051/0004-6361/201629642, S2CID 119369796
  8. ^ Hirsch, Lea A.; Ciardi, David R.; Howard, Andrew W.; Everett, Mark E.; Furlan, Elise; Saylors, Mindy; Horch, Elliott P.; Howell, Steve B.; Teske, Johanna; Marcy, Geoffrey W. (2017), "Assessing the Effect of Stellar Companions from High-resolution Imaging of Kepler Objects of Interest", The Astronomical Journal, 153 (3): 117, arXiv:1701.06577, Bibcode:2017AJ....153..117H, doi:10.3847/1538-3881/153/3/117, S2CID 39321033
  9. ^ 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, arXiv:1604.05744, Bibcode:2016AJ....152....8K, doi:10.3847/0004-6256/152/1/8, S2CID 119110229
  10. ^ 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, arXiv:1208.3312, Bibcode:2013ApJS..208...22X, doi:10.1088/0067-0049/208/2/22, S2CID 17160267
  11. ^ openexoplanetcatalogue.com Kepler-84
  12. ^ 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, arXiv:1702.07714, Bibcode:2017MNRAS.468..549B, doi:10.1093/mnras/stx461, S2CID 119325005
  13. ^ Furlan, E.; Howell, S. B. (2017), "The densities of planets in multiple stellar systems", The Astronomical Journal, 154 (2): 66, arXiv:1707.01942, Bibcode:2017AJ....154...66F, doi:10.3847/1538-3881/aa7b70, S2CID 28833730
  14. ^ Planet Kepler-84 d at exoplanets.eu
  15. ^ Planet Kepler-84 e at exoplanets.eu
  16. ^ Planet Kepler-84 f at exoplanets.eu
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