HD 43691

HD 43691
Observation data
Epoch J2000      Equinox ICRS
Constellation Auriga
Right ascension 06h 19m 34.676s
Declination +41° 05′ 32.30″
Apparent magnitude (V) 8.03
Characteristics
Evolutionary stage subgiant
Spectral type G0 IV
B−V color index 0.596±0.015
Variable type None
Astrometry
Radial velocity (Rv)−28.97±0.02 km/s
Proper motion (μ) RA: 22.684 mas/yr
Dec.: −53.140 mas/yr
Parallax (π)11.6726±0.0346 mas
Distance279.4 ± 0.8 ly
(85.7 ± 0.3 pc)
Absolute magnitude (MV)3.52
Details
Mass1.32±0.09 M☉
Radius1.704±0.023 R☉
Luminosity2.24±0.02 L☉
Surface gravity (log g)4.19±0.02 cgs
Temperature5,920±34 K
Metallicity [Fe/H]0.32±0.03 dex
Rotational velocity (v sin i)4.7 km/s
Age3.1±2.5 Gyr
Other designations
BD+41°1415, HD 43691, HIP 30057, SAO 41025, PPM 48960, TYC 2930-2105-1, GSC 02930-02105, 2MASS J06193467+4105321
Database references
SIMBADdata

HD 43691 is a star with an orbiting exoplanet in the constellation Auriga. With an apparent visual magnitude of 8.03, it is too faint to be visible to the naked eye. This system is located at a distance of 279 light years based on parallax measurements, but is drifting closer with a heliocentric radial velocity of −29 km/s.

This is a slightly evolved G-type subgiant star with a stellar classification of G0 IV. It is ceasing thermonuclear fusion of hydrogen in its core and will expand to become a red giant. The star has 32% greater mass than the Sun and has a 70% larger girth. It is radiating 2.2 times the luminosity of the Sun from its photosphere at an effective temperature of 5,920 K. The level of chromospheric activity is minimal, allowing for accurate measurement of radial velocity variation.

Planetary system

In July 2007, the star is found to have a super-jovian exoplanet in orbit around it. It has minimum mass two and a half times that of Jupiter and orbits the star closer than Mercury to the Sun.

The HD 43691 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination
(°)		 Radius
b ≥2.57+0.31
−0.34 MJ		 0.238+0.014
−0.016		 36.99913+0.00095
−0.00092		 0.085+0.012
−0.011		 — —

See also

References

  1. 1 2 3 4 5 6 7 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 da Silva, Ronaldo; et al. (October 2007). "ELODIE metallicity-biased search for transiting Hot Jupiters IV. Intermediate period planets orbiting the stars HD 43691 and HD 132406". Astronomy and Astrophysics. 473 (1): 323–328. arXiv:0707.0958. Bibcode:2007A&A...473..323D. doi:10.1051/0004-6361:20077314. S2CID 18805775.
  4. 1 2 3 4 5 6 Hill, Michelle L.; et al. (2020). "Orbital Refinement and Stellar Properties for the HD 9446, HD 43691, and HD 179079 Planetary Systems". The Astronomical Journal. 159 (5): 197. arXiv:2003.02385. Bibcode:2020AJ....159..197H. doi:10.3847/1538-3881/ab7d33. S2CID 212414679.
  5. 1 2 3 4 5 Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
  6. ↑ "HD 43691". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-12-16.
  7. ↑ Ment, Kristo; et al. (2018). "Radial Velocities from the N2K Project: Six 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.