Geneva Observatory Web Page Geneva Planet Search Programmes

 
  A 10.5 M_Jup planet on a very eccentric orbit
  Last update: April 7 2008

 
 
 
  • "The CORALIE survey for southern extra-solar planets XV. Discovery of two eccentric planets orbiting HD4113 and HD156846"
    O. Tamuz, D. Ségransan, S. Udry, M. Mayor, A. Eggenberger,D. Naef, F. Pepe, D. Queloz, N.C. Santos, B.-O. Demory, P. Figuera, M. Marmier G. Montagnier, 2008,
    A&A 480, L33 (ADS)
    • Remark 1: Detection anounced during the "Extreme Solar Systems" conference, Santorini, June 2007
    Remark 2: HD 156846 has a visual companion at a separation of 5.1 arcsec. The mass of this object is estimated to be 0.59 M_Sun => it's an early M dwarf

     

    Larger image
    CORALIE data for HD 156846.Top: Temporal velocities and fitted solution
    Middle: Residuals to the fitted orbit.Bottom Phase-folded velocities and fitted orbit.


  • Orbital solution (from Tamuz 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 156846 b
    359.51
    +/- 0.09
    53998.09
    +/- 0.05
    0.8472
    +/- 0.0016
    -68.540
    +/- 0.001
    52.23
    +/- 0.41
    464.3
    +/- 3.0
    10.45
    +/- 0.05
    0.993
    64
    7.7


  • Stellar properties:

    Parameter
    Value
    Reference
    Sp. Type
    G0V
    Hipparcos
    pi [mas]
    20.41 +/- 0.93
    Hipparcos
    d [pc]
    49.0
    Hipparcos
    m_v [mag]
    6.506
    Hipparcos
    B-V [mag]
    0.557
    Hipparcos
    T_eff [K]
    6138 +/- 36
    Tamuz et al. 2007
    M_v [mag]
    3.055
    Tamuz et al. 2007
    L [L_Sun]
    4.98
    Tamuz et al. 2007
    log(g) [CGS]
    4.15 +/- 0.10
    Tamuz et al. 2007
    M_1 [M_Sun]
    1.43
    Tamuz et al. 2007
    Vsini [km/s]
    4.45
    Tamuz et al. 2007
    Age [Gyr]
    2.1-2.7
    Tamuz et al. 2007
    [Fe/H]
    0.22 +/- 0.05
    Tamuz et al. 2007


  • Links:

    ----
    Group Logo
    Extrasolar planet page

    Group Logo
    Planet Search and Stellar Kinematics group page

    Geneva Observatory Logo
    Geneva observatory

    Geneva University banner
    University of Geneva

     

    stephane.udry@obs.unige.ch