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  A Jovian planet around HD 10647

Last update: March 6th 2005
 
 
 
 
 
  • Announced during the XIX th IAP Colloquium "Extrasolar Planets: Today & Tormorrow", Paris, June 2003 (Mayor et al.)
  • The planetary signal is not seen in the AAT data (Jones et al., XIX IAP colloquium). This is probably due to the poor phase coverage of the small AAT radial-velocity set.
  • Planetary signature or stellar activity?

    • A large ISO Infra-Red excess is detected for HD 10647 (Decin et al. 2000)
    • HD 10647 is chromospherically active (log R'HK=-4.68).
    • HD 10647: vsini=4.88 km/s

    but:

    • The calibrated rotational period is more than two orders of magnitude smaller than the observed velocity period (P~1040 d with a false-alarm probability under 0.01%, see periodograms below).
    • No photometric variations (flagged as a constant star in the HIPPARCOS catalogue).
    • No clear correlation between the line bisectors and the velocities (the bisector span is constant, see the plot below).

    • Top: CORALIE temporal velocities and orbital solution
    Bottom: Residuals around the solution
    Bisector Span versus Radial Velocity. The span is nearly constant
    showing that the line profiles are not variable. Line profile
    effects can thus not be responsible for the observed RV variations
    Larger image (407 kb)
    Larger image (373 kb)


    Fourier Transform and Periodogram for HD 10647
    The maximum near 1000 d is highly significant (at least 4 sigma).
    Larger images (184 kb)


  • Orbital solution:

    Object
    Period
    (days)
    T0
    (JD - 2 400 000)
    Eccentricity
    V
    (km/s)
    Omega
    (deg)
    K1
    (km/s)
    m2sini
    (M_Jup)
    a
    (AU)
    N
    Residuals
    (m/s)
    HD 10647
    1040 +/- 37
    52261 +/- 47
    0.18 +/- 0.08
    27.679 +/- 0.0008
    68 +/- 17
    0.018 +/- 0.001
    0.91
    2.1
    72
    8.2


  • Stellar properties:

    Parameter
    Value
    Reference
    Sp. Type
    F8V
    Hipparcos
    pi (mas)
    57.63
    Hipparcos
    d (pc)
    17.4
    Hipparcos
    m_v (mag)
    5.52
    Hipparcos
    B-V (mag)
    0.551
    Hipparcos
    T_eff (K)
    6143 +/- 31
    Santos et al. 2003
    M_v (mag)
    4.32
    -
    L (L_sol)
    1.51
    -
    log(g) (CGS)
    4.48 +/- 0.08
    Santos et al. 2003
    M_1 (M_sol)
    1.07
    Mayor et al. 2003
    log(R'HK)
    -4.68
    Coralie
    P_rot (d)
    7.2
    Mayor et al. 2003
    Vsini (km/s)
    4.88
    Coralie
    Age (Gyr)
    1.75
    Mayor et al. 2003
    [Fe/H]
    -0.03 +/- 0.04
    Coralie

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    stephane.udry@obs.unige.ch