Astronomy:HD 29587
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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) | +112.67±0.20[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) | 1,474.9±10.2 d |
| Eccentricity (e) | 0.713±0.006[5] |
| Periastron epoch (T) | JD 2,447,763.5±45.8 |
| Argument of periastron (ω) (secondary) | 80.2±13.3° |
| Semi-amplitude (K1) (primary) | 1.02±0.16 km/s |
| Details[3] | |
| Mass | 1.033±0.010[5] M☉ |
| Luminosity | 0.798+0.040−0.038 L☉ |
| Surface gravity (log g) | 4.54±0.22 cgs |
| Temperature | 5,709±35 K |
| Metallicity [Fe/H] | −0.51±0.05 dex |
| Age | 14.7+3.8 −2.7 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 29587 is a Sun-like[7] star with a candidate brown dwarf companion[8] 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 36.3 mas,[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[7] star moving at a rate of 170 km/s relative to the local standard of rest.[9]
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]
Planetary system
Formerly an IAU radial velocity standard, this star was found to have a variable radial velocity due to a suspected orbiting companion.[8] The a sin i value for the unseen object is 0.0957 ± 0.0108 astronomical unit|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 41.0–97.8 Jupiter mass, making it a probable brown dwarf.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 55.2±9.2[5] MJ | ≥0.0957±0.0108 | 1,474.9±10.2 | 0.356±0.095 | — | — |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 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. doi:10.1051/0004-6361/201525770. Bibcode: 2015A&A...580A..24D.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 5.2 Kiefer, F. et al. (2019), "Detection and characterisation of 54 massive companions with the SOPHIE spectrograph", Astronomy & Astrophysics 631: A125, doi:10.1051/0004-6361/201935113
- ↑ "HD 29587". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+29587.
- ↑ 7.0 7.1 Fossati, L. et al. (2017). "The effect of ISM absorption on stellar activity measurements and its relevance for exoplanet studies". Astronomy & Astrophysics 601: 17. doi:10.1051/0004-6361/201630339. A104. Bibcode: 2017A&A...601A.104F.
- ↑ 8.0 8.1 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. doi:10.1086/177521. Bibcode: 1996ApJ...466..415M.
- ↑ Hobbs, L. M.; Duncan, Douglas K. (June 15, 1987). "The lithium abundance in halo stars". Astrophysical Journal, Part 1 317: 796–809. doi:10.1086/165328. Bibcode: 1987ApJ...317..796H.
- ↑ 10.0 10.1 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. doi:10.1051/0004-6361/201015861. A140. Bibcode: 2011A&A...527A.140R.
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