HD 45364

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HD 45364
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension  06h 25m 38.48s[1]
Declination −31° 28′ 51.4″[1]
Apparent magnitude (V) 8.07
Characteristics
Spectral type G8V
B−V color index 0.719
V−R color index 0.01
Astrometry
Radial velocity (Rv)15.9 km/s
Proper motion (μ) RA: 53.22 ± 0.48 [1] mas/yr
Dec.: −13.20 ± 0.77 [1] mas/yr
Parallax (π)30.59 ± 0.68[1] mas
Distance107 ± 2 ly
(32.7 ± 0.7 pc)
Absolute magnitude (MV)+5.50
Details
Mass0.88 ± 0.02[2] M
Radius0.82 ± 0.01[2] R
Luminosity0.562 ± 0.004[2] L
Surface gravity (log g)4.55 ± 0.03[2] cgs
Temperature5540 ± 31[2] K
Age3.4 ± 2.7[2] Gyr
Other designations
CD−31° 3286, HD 30579, SAO 196806
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia
data

HD 45364 is a star approximately 107 light years away from Earth in the constellation of Canis Major. As of August 2008 there are two confirmed extrasolar planets (or exoplanets) orbiting around it.[3]

Planetary system[edit]

HD 45364 is one of only a relative few systems that have had more than one exoplanet discovered in its orbit. The two planets, HD 45364 b and HD 45364 c respectively, were both discovered in August 2008.

The HD 45364 planetary system[3]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥0.1872 MJ 0.6813 226.93 ± 0.37 0.1684 ± 0.190
c ≥0.6579 MJ 0.8972 342.85 ± 0.28 0.0974 ± 0.012

Formation scenario[edit]

Hydrodynamic formation scenario of HD45364
Hydrodynamic formation scenario of HD45364

A detailed analysis of the formation scenario revealed that the previously reported orbital configuration might not be correct.[4] The eccentricities are a factor of 4-5 too large to be consistent with standard planet formation theories.[1] This is the first time that planet formation theory was able to predict new orbital parameters of a planetary system. There are other proposed scenario, in which remains the resonant configuration of the planetary system [5]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
  2. ^ a b c d e f 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.
  3. ^ a b Correia, A. C. M.; et al. (2009). "The HARPS search for southern extra-solar planets XVI. HD 45364, a pair of planets in a 3:2 mean motion resonance". Astronomy and Astrophysics. 496 (2): 521–526. arXiv:0902.0597. Bibcode:2009A&A...496..521C. doi:10.1051/0004-6361:200810774.
  4. ^ Rein; et al. (2010). "The dynamical origin of the multi-planetary system HD 45364" (abstract). Astronomy and Astrophysics. 510 (1). arXiv:0910.5082. Bibcode:2010A&A...510A...4R. doi:10.1051/0004-6361/200913208. (web preprint)
  5. ^ Correa-Otto, J. (2013). "A new scenario for the origin of the 3/2 resonant system HD 45364". Astronomy and Astrophysics. 560 (65): 1–10. arXiv:1307.1822. Bibcode:2013A&A...560A..65C. doi:10.1051/0004-6361/201321917.

Coordinates: Sky map 06h 25m 38s, −31° 28′ 51″