KOI-5

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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 [1]   mas
Distance 1,870 ± 70  ly
(570 ± 20  pc)
Position (relative to KOI-5A) [2]
ComponentKOI-5B
Epoch of observation 2016
Angular distance0.029±0.050
Position angle 142.1±1.0°
Observed separation
(projected)
16[ citation needed ] AU
Position (relative to KOI-5A) [2]
ComponentKOI-5C
Epoch of observation 2016
Angular distance0.141±0.050
Position angle 304.3±2.2°
Observed separation
(projected)
78[ citation needed ] AU
Details [3]
KOI-5A
Mass 1.13 [4]   M
Radius 1.840±0.017  R
Luminosity 3.86±0.17  L
Surface gravity (log g)4.19 [5]   cgs
Temperature 5861 [5]   K
Age 3.49±0.41  Gyr
KOI-5B
Mass 1.09 [4]   M
Other designations
TOI-1241, 2MASS J19185753+4438507, KIC 8554498, Gaia EDR3 2126945668448657664
KOI-5A:
KOI-5B:
Database references
SIMBAD data

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
b0.179  MJ 0.059606057.07  R🜨

Related Research Articles

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References

  1. 1 2 3 4 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. Gaia EDR3 record for this source at VizieR.
  2. 1 2 3 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. 1 2 3 4 5 AT LAST! CONFIRMATION OF KEPLER'S SECOND PLANETARY CANDIDATE
  5. 1 2 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. 1 2 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. 1 2 "Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2021-07-17.

Coordinates: Jupiter and moon.png 19h 18m 57.5312s, +44° 38′ 50.6176″