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  A planet around the metal-poor star HD 171028
  Last update: November 25, 2007

 
 
 
 
 
 
  • "The HARPS search for southern extra-solar planets. XII. A giant planet orbiting the metal-poor star HD 171028"
    N.C. Santos, M. Mayor, F. Bouchy, F. Pepe, D. Queloz, S. Udry, 2007, A&A 474, 647 (ADS)
  • Announced during the "Extreme Solar Systems" conference, Santorini, June 26 2007

    •  

    Larger image
    Top: HARPS temporal radial velocities for HD 171028.
    Bottom: Residuals to the fitted orbit.


  • Orbital solution (from Santos et al. 2007):

    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 171028 b
    538
    +/- 2
    53648.92
    +/- 1.89
    0.61
    +/- 0.01
    13.631
    +/- 0.001
    305
    +/- 1
    58.0
    +/- 0.4
    1.83
    1.29
    19
    2.4


  • System parameters:

    Parameter
    Value
    Reference
    Sp. Type
    G0
    Simbad
    pi (mas)
    9.1 +/- 7.8
    Tycho
    d (pc)
    90 +/- 15
    Santos et al. 2007
    m_v (mag)
    8.31
    Simbad
    B-V (mag)
    0.61
    Simbad
    T_eff (K)
    5663 +/- 20
    Santos et al. 2007
    M_v (mag)
    -
    -
    L (L_sol)
    -
    -
    log(g) (CGS)
    3.84 +/- 0.05
    Santos et al. 2007
    M_1 (M_sol)
    0.99 +/- 0.08
    Santos et al. 2007
    R_1 (R_sol)
    1.95 +/- 0.26
    Santos et al. 2007
    log(R'HK)
    -4.92
    Santos et al. 2007
    P_rot (d)
    19
    Santos et al. 2007
    Vsini (km/s)
    2.3
    Santos et al. 2007
    Age (Gyr)
    6--11
    Santos et al. 2007
    [Fe/H]
    -0.49 +/- 0.02
    Santos et al. 2007


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    stephane.udry@obs.unige.ch