HD 207832

HD 207832 is a G-type main-sequence star. Its surface temperature is 5764±15 K.[4] HD 207832 is slightly enriched compared to the Sun in its concentration of heavy elements, with a metallicity Fe/H index of 0.17±0.01 and is much younger at an age of 0.74±0.62 billion years. Kinematically, it belongs to the thin disk of the Milky Way.[4]

HD 207832
Observation data
Epoch J2000      Equinox J2000
Constellation Piscis Austrinus
Right ascension 21h 52m 36.2810s[1]
Declination −26° 01′ 35.6133″[1]
Apparent magnitude (V) 8.79
Characteristics
Evolutionary stage main-sequence star
Spectral type G5V[2]
Astrometry
Radial velocity (Rv)-16.481±0.185[3] km/s
Proper motion (μ) RA: 129.310[3] mas/yr
Dec.: -143.132[3] mas/yr
Parallax (π)16.8897 ± 0.0151[3] mas
Distance193.1 ± 0.2 ly
(59.21 ± 0.05 pc)
Details[4]
Mass1.08±0.01 M☉
Radius0.97±0.02 R☉
Luminosity0.78±0.09[2] L☉
Surface gravity (log g)4.61±0.04 cgs
Temperature5764±15 K
Metallicity [Fe/H]0.17±0.01 dex
Rotation17.8 d[5]
Age0.74±0.62 Gyr
Other designations
CD−26 15858, HIP 107985, TYC 6589-761-1, GSC 06956-00378, 2MASS J21523626-2601352[1]
Database references
SIMBADdata

A multiplicity study in 2014 detected a candidate comoving stellar companion - a red dwarf star or brown dwarf with a spectral class M6.5, at a very wide projected separation of 38.57′ (2.0 light years)[6]

Planetary system

In 2012, two planets, named HD 207832b and HD 207832c, were discovered by the radial velocity method on wide, eccentric orbits.[5] The planetary system would remain stable even if the planetary orbits are coplanar.[7]

Although discovery of the inner planet was confirmed[2] in 2018, the discovery of both planets was suspected to be a false positive in 2020, as newer radial velocity data do not support the existence of the planets.[8]

The HD 207832 planetary system[2][5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (unconfirmed) ≥ 0.56±0.091 MJ 0.586±0.032 160.07±0.23 0.197±0.053 — —
c (unconfirmed) ≥0.73+0.18
−0.05 M⊕		 2.112+0.087
−0.045		 1155.7+71.9
−37.0		 0.27+0.22
−0.10		 — —

References
  1. "HD 207832". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-20.
  2. Ment, Kristo; Fischer, Debra A.; Bakos, Gaspar; Howard, Andrew W.; Isaacson, Howard (2018), "Radial velocities from the N2K Project: 6 new cold gas giant planets orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810", The Astronomical Journal, 156 (5): 213, arXiv:1809.01228, Bibcode:2018AJ....156..213M, doi:10.3847/1538-3881/aae1f5, S2CID 119243619
  3. Brown, A. G. A.; et al. (Gaia collaboration). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics (in press). arXiv:2012.01533. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  4. Maldonado, J.; Villaver, E.; Eiroa, C. (2018), "Chemical fingerprints of hot Jupiter planet formation", Astronomy & Astrophysics, 612: A93, arXiv:1712.01035, Bibcode:2018A&A...612A..93M, doi:10.1051/0004-6361/201732001, S2CID 119458710
  5. Haghighipour, Nader; Butler, R. Paul; Rivera, Eugenio J.; Henry, Gregory W.; Vogt, Steven S. (2012), "The Lick-Carnegie Survey: A New Two-Planet System Around the Star HD 207832", The Astrophysical Journal, 756 (1): 91, arXiv:1207.2806, Bibcode:2012ApJ...756...91H, doi:10.1088/0004-637X/756/1/91, S2CID 1137984
  6. Lodieu, N.; Perez-Garrido, A.; Bejar, V. J. S.; Gauza, B.; Ruiz, M. T.; Rebolo, R.; Pinfield, D. J.; Martin, E. L. (2014), "Binary frequency of planet-host stars at wide separations. A new brown dwarf companion to a planet-host star", Astronomy & Astrophysics, A120: 569, arXiv:1408.1208, Bibcode:2014A&A...569A.120L, doi:10.1051/0004-6361/201424210, S2CID 118516214
  7. Anderson, Kassandra R.; Lai, Dong (2017), "Moderately eccentric warm Jupiters from secular interactions with exterior companions", Monthly Notices of the Royal Astronomical Society, 472 (3): 3692–3705, arXiv:1706.00084, Bibcode:2017MNRAS.472.3692A, doi:10.1093/mnras/stx2250, S2CID 119260335
  8. Luhn, Jacob K.; Wright, Jason T.; Howard, Andrew W.; Isaacson, Howard (2020), "Astrophysical Insights into Radial Velocity Jitter from an Analysis of 600 Planet-search Stars", The Astronomical Journal, 159 (5): 235, arXiv:2004.13734, Bibcode:2020AJ....159..235L, doi:10.3847/1538-3881/ab855a, S2CID 216642215

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