HD 43691 is a star with an orbiting exoplanet in the constellation Auriga. With an apparent visual magnitude of 8.03,[2] 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.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 19m 34.676s[1] |
| Declination | +41° 05′ 32.30″[1] |
| Apparent magnitude (V) | 8.03[2] |
| Characteristics | |
| Spectral type | G0 IV[3] |
| B−V color index | 0.596±0.015[2] |
| Variable type | None[4] |
| Astrometry | |
| Radial velocity (Rv) | −28.97±0.02[2] km/s |
| Proper motion (μ) | RA: 22.684 mas/yr[1] Dec.: −53.140 mas/yr[1] |
| Parallax (π) | 11.6726 ± 0.0346 mas[1] |
| Distance | 279.4 ± 0.8 ly (85.7 ± 0.3 pc) |
| Absolute magnitude (MV) | 3.52[2] |
| Details | |
| Mass | 1.32±0.09[4] M☉ |
| Radius | 1.704±0.023[4] R☉ |
| Luminosity | 2.24±0.02[5] L☉ |
| Surface gravity (log g) | 4.19±0.02[5] cgs |
| Temperature | 5,920±34[5] K |
| Metallicity [Fe/H] | 0.32±0.03[4] dex |
| Rotational velocity (v sin i) | 4.7[3] km/s |
| Age | 3.1±2.5[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a slightly evolved G-type subgiant star with a stellar classification of G0 IV.[3] 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.[4] It is radiating 2.2 times the luminosity of the Sun from its photosphere at an effective temperature of 5,920 K.[5] The level of chromospheric activity is minimal, allowing for accurate measurement of radial velocity variation.[3]
Planetary system
editIn July 2007, the star is found to have a super-jovian exoplanet in orbit around it.[3] It has minimum mass two and a half times that of Jupiter and orbits the star closer than Mercury to the Sun.
| 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
editReferences
edit- ^ a b c d 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.
- ^ a b c d e f 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.
- ^ a b c d e 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.
- ^ a b c d e f 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.
- ^ a b c d e 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.
- ^ "HD 43691". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-12-16.
- ^ 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.