HD 37124

HD 37124 is a yellow dwarf star approximately 103 light-years away in the constellation of Taurus (the Bull). Three extrasolar planets have been found to orbit the star.

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
Characteristics
Spectral type G4IV-V[2]
B−V color index 0.66
Astrometry
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[1] mas
Distance103.4 ± 0.2 ly
(31.69 ± 0.08 pc)
Details
Mass0.81 ± 0.01[3] M☉
Radius0.92 ± 0.02[3] R☉
Luminosity0.839 ± 0.003[3] L☉
Surface gravity (log g)4.41 ± 0.01[3] cgs
Temperature5763 ± 22[3] K
Metallicity [Fe/H]−0.44 dex
Age11.8 ± 1.2[3] Gyr
Other designations
BD+20°1018, Gliese 209, HIP 26381, G 100-27, SAO 77323[2]
Database references
SIMBADdata

Planetary system

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)[4][5] 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,[6] but this was subsequently found to be unstable.[7] Solving this, a three-planet solution was announced in 2005:[8] 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.[9]

The HD 37124 planetary system[9]
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 ≥0.696 ± 0.059 MJ 2.807 ± 0.038 1862 ± 38 0.16 ± 0.14 — —
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See also

References
  1. 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.
  2. "HD 37124". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2014-10-26.
  3. 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.
  4. "Astronomers discover six new planets orbiting nearby stars" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. November 1, 1999. Retrieved December 19, 2017.
  5. 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.
  6. 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.
  7. 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.
  8. Vogt, Steven S.; et al. (2005). "Five New Multicomponent Planetary Systems". The Astrophysical Journal. 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901.
  9. 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.

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