HD 92788

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HD 92788
Observation data
Epoch J2000       Equinox J2000
Constellation Sextans
Right ascension 10h 42m 48.52807s [1]
Declination −02° 11′ 01.5221″ [1]
Apparent magnitude  (V)7.31 [2]
Characteristics
Spectral type G6V [3]
B−V color index 0.694±0.005 [2]
Astrometry
Radial velocity (Rv)−4.455±0.0518 [4]  km/s
Proper motion (μ)RA: −15.128±0.080 [1]   mas/yr
Dec.: −223.230±0.061 [1]   mas/yr
Parallax (π)28.8281 ± 0.0493  mas [1]
Distance 113.1 ± 0.2  ly
(34.69 ± 0.06  pc)
Absolute magnitude  (MV)4.56 [2]
Details
Mass 1.032 [5]   M☉
Radius 1.14±0.01 [1]   R☉
Luminosity 1.253±0.003 [1]   L☉
Surface gravity (log g)4.39 [5]   cgs
Temperature 5,722+11
−22 [1]   K
Metallicity [Fe/H]0.22±0.05 [6]   dex
Rotation 31.7 [6] days
Age 7.6±2.4 [2]   Gyr
Other designations
BD–01°2431, HD  92788, HIP  52409, SAO  137743, LTT  3928, 2MASS J10424853-0211011 [7]
Database references
SIMBAD data
Exoplanet Archive data

HD 92788 is a star in the equatorial constellation of Sextans. It has a yellow hue but is too dim to be visible to the naked eye, having an apparent visual magnitude of 7.31. [2] The star is located at a distance of 113  light years from the Sun based on parallax, but is drifting closer with a radial velocity of −4.5 km/s. [4] Two planets have been found in orbit around the star. [5]

Contents

This is a G-type main-sequence star with a stellar classification of G6V. [3] It is estimated to be around eight billion years old and is spinning with a rotation period of 31.7 days. [6] The star has a similar mass to the Sun and is slightly larger in radius, with a high metallicity. It is radiating 1.25 [1] times the luminosity of the Sun from its photosphere at an effective temperature of 5,722 K. [1]

Planetary system

An extrasolar planet was discovered orbiting this star in 2001 by means of the radial velocity method. Designated component 'b', it is a Super-Jupiter or possibly a low-mass brown dwarf with an orbital period of 0.89 years. [6] The star rotates at an inclination of 8+14
−8 degrees relative to Earth. [8] It is probable that this planet shares that inclination. [9] [10]

A low-mass brown dwarf companion was announced in 2019. Designated component 'c', it orbiting with a period of around 27 years and a semimajor axis of 9.4  AU . [11]

The HD 92788 planetary system [5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥3.78±0.18  MJ 0.971±0.023325.72±0.030.351±0.004——
c ≥3.64±0.69  MJ 9.43±0.639,857±9260.18±0.08——

See also

Related Research Articles

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References

  1. 1 2 3 4 5 6 7 8 9 10 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.
  2. 1 2 3 4 5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID   119257644.
  3. 1 2 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  4. 1 2 Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv: 1804.09370 . Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID   52952408.
  5. 1 2 3 4 Wittenmyer, Robert A.; et al. (April 2019). "Truly eccentric - I. Revisiting eight single-eccentric planetary systems". Monthly Notices of the Royal Astronomical Society. 484 (4): 5859–5867. arXiv: 1901.08471 . Bibcode:2019MNRAS.484.5859W. doi:10.1093/mnras/stz290.
  6. 1 2 3 4 Fischer, Debra A.; et al. (2001). "Planetary Companions to HD 12661, HD 92788, and HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets". The Astrophysical Journal. 551 (2): 1107–1118. Bibcode:2001ApJ...551.1107F. doi: 10.1086/320224 .
  7. ↑ "HD 92788". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-04-02.
  8. ↑ Simpson, E. K.; et al. (November 2010). "Rotation periods of exoplanet host stars". Monthly Notices of the Royal Astronomical Society . 408 (3): 1666–1679. arXiv: 1006.4121 . Bibcode:2010MNRAS.408.1666S. doi:10.1111/j.1365-2966.2010.17230.x. S2CID   6708869.
  9. ↑ "hd_92788_b". Extrasolar Planet Encyclopaedia. Retrieved November 12, 2012.
  10. ↑ Sanchis-Ojeda, Roberto; et al. (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten. 334 (1–2): 180–183. arXiv: 1211.2002 . Bibcode:2013AN....334..180S. doi:10.1002/asna.201211765. S2CID   38743202.
  11. ↑ Rickman, E. L.; et al. (May 2019). "The CORALIE survey for southern extrasolar planets. XVIII. Three new massive planets and two low-mass brown dwarfs at greater than 5 AU separation". Astronomy & Astrophysics. 625: 16. arXiv: 1904.01573 . Bibcode:2019A&A...625A..71R. doi:10.1051/0004-6361/201935356. S2CID   91184450. A71.

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