HD 29587
An artist's concept of brown dwarf HD 29587 b. | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 04h 41m 36.31645s[1] |
Declination | +42° 07′ 06.4209″[1] |
Apparent magnitude (V) | 7.29[2] |
Characteristics | |
Spectral type | G2 V[3] |
B−V color index | 0.633[3] |
Astrometry | |
Radial velocity (Rv) | ±0.20 +112.67[1] km/s |
Proper motion (μ) | RA: +534.004[1] mas/yr Dec.: −414.768[1] mas/yr |
Parallax (π) | 36.3130 ± 0.0697[1] mas |
Distance | 89.8 ± 0.2 ly (27.54 ± 0.05 pc) |
Absolute magnitude (MV) | 5.08[3] |
Orbit[4] | |
Period (P) | ±10.2 d 1,474.9 |
Eccentricity (e) | ±0.095 0.356 |
Periastron epoch (T) | JD ±45.8 2,447,763.5 |
Argument of periastron (ω) (secondary) | ±13.3 80.2° |
Semi-amplitude (K1) (primary) | ±0.16 km/s 1.02 |
Details[3] | |
Mass | ±0.03 0.78 M☉ |
Luminosity | +0.040 −0.038 0.798 L☉ |
Surface gravity (log g) | ±0.22 4.54 cgs |
Temperature | ±35 5,709 K |
Metallicity [Fe/H] | ±0.05 −0.51 dex |
Age | +3.8 −2.7 14.7 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
Extrasolar Planets Encyclopaedia | data |
HD 29587 is a Sun-like[6] star with a candidate brown dwarf companion[7] in the northern constellation of Perseus. It has an apparent visual magnitude of 7.29,[2] which means it is too faint to be viewed with the naked eye. Based upon an annual parallax shift of mas, 36.3[1] it is located 89.8 light years away. The star is moving away from the Earth with a heliocentric radial velocity of +113 km/s,[1] having come to within 55.8 ly some 148,000 years ago.[2] It is a hyper-velocity halo[6] star moving at a rate of 170 km/s relative to the local standard of rest.[8]
This ancient star has a stellar classification of G2 V,[3] matching a G-type main-sequence star. It has 78% of the mass of the Sun and is radiating 80% of the Sun's luminosity from its photosphere at an effective temperature of 5,709 K.[3]
Formerly an IAU radial velocity standard, this star was found to have a variable radial velocity due to a suspected orbiting companion.[7] The a sin i value for the unseen object is 0.0957 ± 0.0108 AU (14.31 ± 1.62 Gm),[4] where a is the semimajor axis and i is the orbital inclination – providing a lower bound for the semimajor axis. The secondary object most likely has a mass in the range MJ, making it a probable 41.0–97.8brown dwarf.[9]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥±0.03 0.78 MJ | ≥±0.0108 0.0957 | ±10.2 1,474.9 | ±0.095 0.356 | — | — |
References
- 1 2 3 4 5 6 7 8 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.
- 1 2 3 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.
- 1 2 3 4 5 6 Da Silva, Ronaldo; et al. (2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy & Astrophysics. 580: A24. Bibcode:2015A&A...580A..24D. doi:10.1051/0004-6361/201525770.
- 1 2 Halbwachs, J. L.; et al. (March 2000). "Exploring the brown dwarf desert with Hipparcos". Astronomy and Astrophysics. 355: 581–594. Bibcode:2000A&A...355..581H.
- ↑ "HD 29587". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-02.
- 1 2 Fossati, L.; et al. (May 2015). "The effect of ISM absorption on stellar activity measurements and its relevance for exoplanet studies". Astronomy & Astrophysics. 601: 17. arXiv:1702.02883. Bibcode:2017A&A...601A.104F. doi:10.1051/0004-6361/201630339. A104.
- 1 2 Mazeh; Latham, David W.; Stefanik, Robert P. (1996). "Spectroscopic Orbits for Three Binaries with Low-Mass Companions and the Distribution of Secondary Masses near the Substellar Limit". Astrophysical Journal. 466: 415–427. Bibcode:1996ApJ...466..415M. CiteSeerX 10.1.1.30.5905. doi:10.1086/177521.
- ↑ Hobbs, L. M.; Duncan, Douglas K. (June 15, 1987). "The lithium abundance in halo stars". Astrophysical Journal, Part 1. 317: 796–809. Bibcode:1987ApJ...317..796H. doi:10.1086/165328.
- 1 2 Reffert, S.; Quirrenbach, A. (March 2011). "Mass constraints on substellar companion candidates from the re-reduced Hipparcos intermediate astrometric data: nine confirmed planets and two confirmed brown dwarfs". Astronomy & Astrophysics. 527: 22. arXiv:1101.2227. Bibcode:2011A&A...527A.140R. doi:10.1051/0004-6361/201015861. A140.