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  2 planets in a 3:2 mean-motion resonance around HD 45364
  Last update: February 6 2009

 
 
  • "HD45364, a pair of planets in a 3:2 mean motion resonance"
    A.C.M. Correia, S. Udry, M. Mayor, W. Benz, J.-L. Bertaux, F. Bouchy, J. Laskar, C. Lovis, C. Mordasini, F. Pepe, D. Queloz, 2009
    A&A submitted (astro-ph/0902.0597)
  • The dynamical study performed by Correia et al. shows the system is stable over Gyr timescales.

    •  
    Larger image
    HARPS radial-velocity data (red dots) and fitted
    orbital solution (solid curve) for HD45364


  • 3-body Newtonian orbital solution at JD=53500 (from Correia et al. 2009):

    Object
    Period
    (days)
    lambda
    (deg)
    Eccentricity
    V
    (km/s)
    Omega
    (deg)
    K1
    (m/s)
    m2sini
    (M_Jup)
    a
    (AU)
    N
    Residuals
    (m/s)
    HD 45364 b
    226.93
    +/-
    0.37
    105.76
    +/-
    1.41
    0.1684
    (fixed)
    16.4665
    +/-
    0.0002
    162.58
    +/-
    6.34
    7.22
    +/-
    0.14
    0.1872
    0.6813
    58
    1.417
    HD 45364 c
    342.85
    +/-
    0.28
    269.52
    +/-
    0.58
    0.0974
    +/-
    0.012
    "
    7.41
    +/-
    4.30
    21.92
    +/-
    0.43
    0.6579
    0.8972
    "
    "


  • Stellar properties:

    Parameter
    Value
    Reference
    Sp. Type
    K0V
    Hipparcos
    pi (mas)
    30.69 +/- 0.81
    Hipparcos
    d (pc)
    32.6
    Hipparcos
    m_v (mag)
    8.08
    Hipparcos
    B-V (mag)
    0.72
    Hipparcos
    T_eff (K)
    5434 +/- 20
    Sousa et al. 2008
    M_v (mag)
    5.51
    Correia et al. 2009
    L (L_sol)
    0.57
    Correia et al. 2009
    log(g) (CGS)
    4.38 +/- 0.03
    Sousa et al. 2008
    M_1 (M_sol)
    0.82 +/- 0.05
    Sousa et al. 2008
    log(R'HK)
    -4.94
    Correia et al. 2009
    P_rot (d)
    32
    Correia et al. 2009
    Vsini (km/s)
    1.0
    Correia et al. 2009
    Age (Gyr)
    -
    -
    [Fe/H]
    -0.17 +/- 0.01
    Sousa et al. 2008


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    stephane.udry@obs.unige.ch