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  HD 219828 b: A Neptune-mass planet
  Last update: June 1st 2007

 
 
 
 
 
 
  • A new Neptune-mass planet orbiting HD 219828
    C. Melo, N. C. Santos, W. Gieren, G. Pietrzynski, M. T. Ruiz, S. G. Sousa, F. Bouchy, C. Lovis, M. Mayor, F. Pepe, D. Queloz, R. da Silva, S. Udry, 2007
    A&A 467, 721 (ADS)

  •  
    HARPS radial-velocity data for HD 219828
    Top: Phase folded RVs (quadratic drift substracted)
    Bottom: RVs versus time for epoch of measurements.
    Larger image

  • Orbital solution (from Melo et al. 2007, additional quadratic drift included in the fit):

    Object
    Period
    (days)
    T0
    (JD - 2 400 000)
    Eccentricity
    V
    (km/s)
    Omega
    (deg)
    K1
    (m/s)
    m2sini
    (M_Earth)
    a
    (AU)
    N
    Residuals
    (m/s)
    HD 219828 b
    3.8335 +/- 0.0013
    53898.6289 +/- 0.072
    0.0 (fixed)
    -24.032 +/- 0.001
    0.0 (fixed)
    7.0 +/- 0.5
    19.8
    0.05
    22
    1.7


  • Stellar properties:

    Parameter
    Value
    Reference
    Sp. Type
    G0IV
    Hipparcos
    pi (mas)
    12.33
    Hipparcos
    d (pc)
    81.1
    Hipparcos
    m_v (mag)
    8.04
    Hipparcos
    B-V (mag)
    0.654
    Hipparcos
    T_eff (K)
    5891 +/- 18
    Melo et al. 2007
    M_v (mag)
    3.49
    Melo et al. 2007
    L (L_sol)
    3.34
    Melo et al. 2007
    log(g) (CGS)
    4.18 +/- 0.02
    Melo et al. 2007
    M_1 (M_sol)
    1.24
    Melo et al. 2007
    log(R'HK)
    -5.04
    Melo et al. 2007
    P_rot (d)
    26
    Melo et al. 2007
    Vsini (km/s)
    2.9
    Melo et al. 2007
    Age (Gyr)
    >2
    Melo et al. 2007
    [Fe/H]
    0.19 +/- 0.03
    Melo et al. 2007


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    stephane.udry@obs.unige.ch