KOI-5
Observation data
Epoch J2000      Equinox
Constellation Cygnus
Right ascension 19h 18m 57.5312s
Declination +44° 38′ 50.6176″
Astrometry
Radial velocity (Rv)-35.16[1] km/s
Proper motion (μ) RA: 3.216[1] mas/yr
Dec.: -10.925[1] mas/yr
Parallax (π)1.7436 ± 0.0666 mas[1]
Distance1,870 ± 70 ly
(570 ± 20 pc)
Position (relative to KOI-5A)[2]
ComponentKOI-5B
Epoch of observation2016
Angular distance0.029±0.050″
Position angle142.1±1.0°
Projected separation16[citation needed] AU
Position (relative to KOI-5A)[2]
ComponentKOI-5C
Epoch of observation2016
Angular distance0.141±0.050″
Position angle304.3±2.2°
Projected separation78[citation needed] AU
Details[3]
KOI-5A
Mass1.13[4] M☉
Radius1.840±0.017 R☉
Luminosity3.86±0.17 L☉
Surface gravity (log g)4.19[5] cgs
Temperature5861[5] K
Age3.49±0.41 Gyr
KOI-5B
Mass1.09[4] M☉
Other designations
TOI-1241, 2MASS J19185753+4438507, KIC 8554498, Gaia EDR3 2126945668448657664
KOI-5A:
KOI-5B:
Database references
SIMBADdata

KOI-5 is a triple star system composed of three stars: KOI-5 A, KOI-5 B and KOI-5 C, orbiting 1,870±70 light-years away.

The two dim stellar companions to KOI-5A were discovered in 2016.[2] KOI-5 A and B orbit each other every 29 years, and KOI-5 C orbits stars A and B every 400 years.[4] KOI-5C is physically associated with the core stellar pair with probability 99.98%.[6]

Planetary system

Two planets orbiting one of KOI-5's stars were suspected since 2009 based on Kepler data, but KOI-5Ab was confirmed only in January 2021 after TESS determined the planet is orbiting KOI-5A. The exoplanet has caused interest in the scientific community because its orbital plane is misaligned with the closer star, suggesting it gave KOI-5Ab a gravitational kick during its development, resulting in the misalignment and inward migration to the current orbit.[4][7] However, the confirmation of this planet has yet to be published in any peer-reviewed journal.

A second candidate planet was initially suspected, but was later found to be a false positive.[8]

The KOI-5A planetary system[6][4][8]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.179 MJ 0.0596060 5 — — 7.07 R🜨

References

  1. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b c Furlan, E.; Ciardi, D. R.; Everett, M. E.; Saylors, M.; Teske, J. K.; Horch, E. P.; Howell, S. B.; Van Belle, G. T.; Hirsch, L. A.; Gautier, T. N.; Adams, E. R.; Barrado, D.; Cartier, K. M. S.; Dressing, C. D.; Dupree, A. K.; Gilliland, R. L.; Lillo-Box, J.; Lucas, P. W.; Wang, J. (2017), "The Kepler Follow-Up Observation Program. I. A Catalog of Companions To Kepler Stars from High-Resolution Imaging", The Astronomical Journal, 153 (2): 71, arXiv:1612.02392, Bibcode:2017AJ....153...71F, doi:10.3847/1538-3881/153/2/71, S2CID 38339900
  3. ^ Bellinger, E. P.; Hekker, S.; Angelou, G. C.; Stokholm, A.; Basu, S. (2020), "Stellar ages, masses, and radii from asteroseismic modeling are robust to systematic errors in spectroscopy", Astronomy & Astrophysics, 622: A130, arXiv:1812.06979, doi:10.1051/0004-6361/201834461, S2CID 119293351
  4. ^ a b c d e AT LAST! CONFIRMATION OF KEPLER'S SECOND PLANETARY CANDIDATE
  5. ^ a b Batalha, Natalie M.; Rowe, Jason F.; Bryson, Stephen T.; Barclay, Thomas; Burke, Christopher J.; Caldwell, Douglas A.; Christiansen, Jessie L.; Mullally, Fergal; Thompson, Susan E.; Brown, Timothy M.; Dupree, Andrea K.; Fabrycky, Daniel C.; Ford, Eric B.; Fortney, Jonathan J.; Gilliland, Ronald L.; Isaacson, Howard; Latham, David W.; Marcy, Geoffrey W.; Quinn, Samuel N.; Ragozzine, Darin; Shporer, Avi; Borucki, William J.; Ciardi, David R.; Gautier, Thomas N.; Haas, Michael R.; Jenkins, Jon M.; Koch, David G.; Lissauer, Jack J.; Rapin, William; et al. (2013), "Planetary Candidates Observed by Kepler . III. Analysis of the First 16 Months of Data", The Astrophysical Journal Supplement Series, 204 (2): 24, arXiv:1202.5852, Bibcode:2013ApJS..204...24B, doi:10.1088/0067-0049/204/2/24, S2CID 19023502
  6. ^ a b 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
  7. ^ Chen, Rick (2021-01-11). "Planetary Sleuthing Finds Triple-Star World". NASA. Retrieved 2021-01-13.
  8. ^ a b "Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2021-07-17.
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