HD 37124
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 05h 37m 02.4867s[1] |
| Declination | +20° 43′ 50.8346″[1] |
| Apparent magnitude (V) | 7.68[2] |
| Characteristics | |
| Spectral type | G4IV-V[3] |
| B−V color index | 0.667±0.008[2] |
| Astrometry | |
| Radial velocity (Rv) | −23.02±0.09[2] km/s |
| Proper motion (μ) | RA: −79.607±0.184[1] mas/yr Dec.: −420.161±0.166[1] mas/yr |
| Parallax (π) | 31.5536 ± 0.0751 mas[1] |
| Distance | 103.4 ± 0.2 ly (31.69 ± 0.08 pc) |
| Absolute magnitude (MV) | 5.05[2] |
| Details[4] | |
| Mass | 0.81±0.01 M☉[4] 0.92±0.01[5] M☉ |
| Radius | 0.92±0.02 R☉ 0.91+0.01 −0.04[1] R☉ |
| Luminosity | 0.839±0.003 L☉[4] 0.772+0.003 −0.002[1] L☉ |
| Surface gravity (log g) | 4.41±0.01 cgs |
| Temperature | 5,763±22 K |
| Metallicity [Fe/H] | −0.38±0.01 dex[2] −0.45[6] dex |
| Rotational velocity (v sin i) | 3.6[5] km/s |
| Age | 11.8±1.2 Gyr[4] 10.62±1.74[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 37124 is a star in the equatorial constellation of Taurus (the Bull), positioned about a half degree to the SSW of the bright star Zeta Tauri.[7] The apparent visual magnitude of this star is 7.68,[2] which is too dim to be visible to the naked eye. It is located at a distance of 103 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −23 km/s.[2] Three extrasolar planets have been found to orbit the star.
The stellar classification of HD 37124 is G4IV-V, showing a spectrum with blended traits of a main sequence star and a more evolved subgiant star. It is a quiet star with a low activity index.[8] This star is smaller than the Sun, with 81–92% of the mass of the Sun and around 92% of the Sun's radius. It is an older, thick disk[9] star with an age of around 11 billion years, and is spinning with a projected rotational velocity of 3.6 km/s.[5] The metallicity of the star, what astronomers term the abundance of heavier elements, is much lower than in the Sun with an iron abundance of 35–41%. It is radiating 77–84% of the Sun's luminosity from its photosphere at an effective temperature of 5,763 K.
Planetary system
[edit]As of 2011, three extrasolar planets have been found to orbit the star. Announced on the first of November 1999, the first planet (HD 37124 b)[10][11] was discovered orbiting its parent star around the inner edge of the habitable zone, causing the planet to have a somewhat similar insolation to that of Venus. A second planet became apparent by 2003, thought to orbit in a 1940 days on an eccentric orbit,[12] but this was subsequently found to be unstable.[13] Solving this, a three-planet solution was announced in 2005:[14] this contained a second planet (HD 37124 c) orbiting at the outer edge of the habitable zone with an insolation similar to that of Mars, and a third planet, (HD 37124 d). While not obviously in any orbital resonances in 2005, an updated solution announced in 2011 found planets 'c' and 'd' to likely be in a 2:1 resonance.[15]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥0.675±0.017 MJ | 0.53364±0.00020 | 154.378±0.089 | 0.054±0.028 | — | — |
| c | ≥0.652±0.052 MJ | 1.7100±0.0065 | 885.5±5.1 | 0.125±0.055 | — | — |
| d | ≥0.69±0.059 MJ | 2.807±0.038 | 1,862±38 | 0.16±0.14 | — | — |
See also
[edit]References
[edit]- ^ a b c d e f g 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.
- ^ a b c d e f g 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 "HD 37124". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2014-10-26.
- ^ a b c d 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.
- ^ a b c d Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv:1611.02897. Bibcode:2017AJ....153...21L. doi:10.3847/1538-3881/153/1/21. S2CID 119511744. 21.
- ^ Huang, C.; et al. (October 2005). "Chemical abundances of 22 extrasolar planet host stars*". Monthly Notices of the Royal Astronomical Society. 363 (1): 71–78. Bibcode:2005MNRAS.363...71H. doi:10.1111/j.1365-2966.2005.09395.x.
- ^ Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. Vol. 1. Sky Publishing Corporation and the European Space Agency. p. 182. ISBN 0-933346-84-0.
- ^ Goździewski, Krzysztof; et al. (July 2006). "Orbital Configurations and Dynamical Stability of Multiplanet Systems around Sun-like Stars HD 202206, 14 Herculis, HD 37124, and HD 108874". The Astrophysical Journal. 645 (1): 688–703. arXiv:astro-ph/0511463. Bibcode:2006ApJ...645..688G. doi:10.1086/504030. S2CID 15012577.
- ^ Gonzalez, Guillermo (October 2009). "Stars with planets and the thick disc". Monthly Notices of the Royal Astronomical Society: Letters. 399 (1): L103 – L107. Bibcode:2009MNRAS.399L.103G. doi:10.1111/j.1745-3933.2009.00734.x.
- ^ "Astronomers discover six new planets orbiting nearby stars" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. November 1, 1999. Retrieved December 19, 2017.
- ^ Vogt, Steven S.; et al. (2000). "Six New Planets from the Keck Precision Velocity Survey". The Astrophysical Journal. 536 (2): 902–914. arXiv:astro-ph/9911506. Bibcode:2000ApJ...536..902V. doi:10.1086/308981. S2CID 119375519.
- ^ Butler, R. Paul; et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". The Astrophysical Journal. 582 (1): 455–466. Bibcode:2003ApJ...582..455B. CiteSeerX 10.1.1.7.6988. doi:10.1086/344570. S2CID 17608922.
- ^ Goźdiewski, K. (2003). "A dynamical analysis of the HD 37124 planetary system". Astronomy and Astrophysics. 398 (1): 315–325. Bibcode:2003A&A...398..315G. doi:10.1051/0004-6361:20021602.
- ^ Vogt, Steven S.; et al. (2005). "Five New Multicomponent Planetary Systems" (PDF). The Astrophysical Journal. 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901. S2CID 16509245. Retrieved 2020-12-11.
- ^ a b Wright, J. T.; et al. (2011). "The California Planet Survey. III. A Possible 2:1 Resonance in the Exoplanetary Triple System HD 37124". The Astrophysical Journal. 730 (2): 61–145. arXiv:1101.1097. Bibcode:2011ApJ...730...93W. doi:10.1088/0004-637X/730/2/93. S2CID 119273897.
External links
[edit]- Jianghui Ji; et al. (2003-05-23). "The Librating Companions in HD 37124, HD 12661, HD 82943, 47 Uma and GJ 876: Alignment or Antialignment?". The Astrophysical Journal. 591 (1): L57 – L60. arXiv:astro-ph/0305448. Bibcode:2003ApJ...591L..57J. doi:10.1086/377038. S2CID 12743267.
- "Notes for star HD 37124". Extrasolar Planets Encyclopaedia. Archived from the original on November 6, 2007. Retrieved 2008-06-22.
