HD 45364

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
HIP 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 orbiting around it.[3]

Planetary system

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

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. 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

  1. 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752 Freely accessible. doi:10.1051/0004-6361:20078357.Vizier catalog entry
  2. 1 2 3 4 5 6 Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. Bibcode:2015A&A...575A..18B. arXiv:1411.4302 Freely accessible. doi:10.1051/0004-6361/201424951.
  3. 1 2 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. Bibcode:2009A&A...496..521C. arXiv:0902.0597 Freely accessible. 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). Bibcode:2010A&A...510A...4R. arXiv:0910.5082 Freely accessible. 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. Bibcode:2013A&A...560A..65C. arXiv:1307.1822 Freely accessible. doi:10.1051/0004-6361/201321917.

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


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