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  HD 145377 b: a massive planet on an intermediate period 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)
  • The high residuals to the fitted orbit are mostly due to stellar activity. A long-period trend may nevertheless be present (see middle panel of the figure below) revealing the presence of an additional body in the system. More data are needed to establish its presence.

    •  
    Larger image
    HARPS radial-velocity data for HD 145377
    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 145377 b
    103.95
    +/-
    0.13
    54635.4
    +/-
    0.6
    0.307
    +/-
    0.017
    11.650
    +/-
    0.003
    138.1
    +/-
    2.8
    242.7
    +/-
    4.6
    5.76
    +/-
    0.10
    0.45
    +/-
    0.004
    64
    15.3


  • Stellar properties:

    Parameter
    Value
    Reference
    Sp. Type
    G3V
    Hipparcos
    pi (mas)
    18.27 +/- 0.94
    Hipparcos
    d (pc)
    57.7 +/- 3.0
    Hipparcos
    m_v (mag)
    8.12
    Hipparcos
    B-V (mag)
    0.623
    Hipparcos
    T_eff (K)
    6046 +/- 15
    Moutou et al. 2008
    M_v (mag)
    4.31
    Moutou et al. 2008
    L (L_sol)
    1.56 +/- 0.17
    Moutou et al. 2008
    log(g) (CGS)
    4.49 +/- 0.10
    Moutou et al. 2008
    M_1 (M_sol)
    1.12 +/- 0.03
    Moutou et al. 2008
    R (R_sol)
    1.14
    Moutou et al. 2008
    log(R'HK)
    -4.62 +/- 0.04
    Moutou et al. 2008
    P_rot (d)
    12
    Moutou et al. 2008
    Vsini (km/s)
    3.85
    Moutou et al. 2008
    Age (Gyr)
    1.3 +/- 1
    Moutou et al. 2008
    [Fe/H]
    0.12 +/- 0.01
    Moutou et al. 2008


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    stephane.udry@obs.unige.ch