Jump to content

HD 37124

Coordinates: Sky map 05h 37m 02.4864s, +20° 43′ 50.836″
From Wikipedia, the free encyclopedia
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]
Distance103.4 ± 0.2 ly
(31.69 ± 0.08 pc)
Absolute magnitude (MV)5.05[2]
Details[4]
Mass0.81±0.01 M[4]
0.92±0.01[5] M
Radius0.92±0.02 R
0.91+0.01
−0.04
[1] R
Luminosity0.839±0.003 L[4]
0.772+0.003
−0.002
[1] L
Surface gravity (log g)4.41±0.01 cgs
Temperature5,763±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
Age11.8±1.2 Gyr[4]
10.62±1.74[5] Gyr
Other designations
BD+20°1018, GJ 209, HD 37124, HIP 26381, SAO 77323, G 100-27[3]
Database references
SIMBADdata

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]

The HD 37124 planetary system[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]
  1. ^ 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.
  2. ^ 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.
  3. ^ a b "HD 37124". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2014-10-26.
  4. ^ 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.
  5. ^ 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.
  6. ^ 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.
  7. ^ 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.
  8. ^ 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.
  9. ^ 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.
  10. ^ "Astronomers discover six new planets orbiting nearby stars" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. November 1, 1999. Retrieved December 19, 2017.
  11. ^ 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.
  12. ^ 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.
  13. ^ 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.
  14. ^ 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.
  15. ^ 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.
[edit]