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  HD 20868 b: a 2 M_Jup planet with a very eccentric orbit
  Last update: October 26 2008

 
 
  • "The HARPS search for southern extra-solar planets. XVII Six long-period giant planets around BD -17 0063, HD 20868, HD 73267, HD 131664, HD 145377 HD 153950"
    C. Moutou, M. Mayor, G. Lo Curto, S. Udry, F. Bouchy, W. Benz, C. Lovis, D. Naef, F. Pepe, D. Queloz, N.C. Santos, 2008
    A&A in press (atro-ph/0810.4662)

    •  
    Larger image
    HARPS radial-velocity data for HD 20868
    Top: Temporal velocities and fitted orbital solution.
    Middle: Residuals to the fitted orbit.
    Bottom: Phase-folded velocities and fitted orbit.


  • Orbital solution (from Moutou et al. 2008):

    Object
    Period
    (days)
    T0
    (JD - 2 400 000)
    Eccentricity
    V
    (km/s)
    Omega
    (deg)
    K1
    (m/s)
    m2sini
    (M_Jup)
    a
    (AU)
    N
    Residuals
    (m/s)
    HD 20868 b
    380.85
    +/-
    0.09
    54451.52
    +/-
    0.1
    0.75
    +/-
    0.002
    46.245
    +/-
    0.0003
    356.2
    +/-
    0.4
    100.34
    +/-
    0.42
    1.99
    +/-
    0.05
    0.947
    +/-
    0.012
    48
    1.7


  • Stellar properties:

    Parameter
    Value
    Reference
    Sp. Type
    K3/4IV
    Hipparcos
    pi (mas)
    20.42 +/- 1.38
    Hipparcos
    d (pc)
    48.9 +/- 3.5
    Hipparcos
    m_v (mag)
    9.92
    Hipparcos
    B-V (mag)
    1.037
    Hipparcos
    T_eff (K)
    4795 +/- 124
    Moutou et al. 2008
    M_v (mag)
    6.47
    Moutou et al. 2008
    L (L_sol)
    0.296 +/- 0.04
    Moutou et al. 2008
    log(g) (CGS)
    4.22 +/- 0.26
    Moutou et al. 2008
    M_1 (M_sol)
    0.78 +/- 0.03
    Moutou et al. 2008
    R (R_sol)
    0.79
    Moutou et al. 2008
    log(R'HK)
    -4.99 +/- 0.10
    Moutou et al. 2008
    P_rot (d)
    51
    Moutou et al. 2008
    Vsini (km/s)
    1.1
    Moutou et al. 2008
    Age (Gyr)
    4.5 +/- 4
    Moutou et al. 2008
    [Fe/H]
    0.04 +/- 0.10
    Moutou et al. 2008


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    stephane.udry@obs.unige.ch