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  A planetary system around HD 74156
  Last update: October 15 2008

 
 
  • Confirmation of planets b & c + detection of planet d: "Detection of a Third Planet in the HD 74156 System Using the Hobby-Eberly Telescope"
    J.L. Bean, B.E. McArthur, G.F. Benedict, A. Armstrong, 2008
    ApJ 672, 1202 (ADS)
  • Discovery paper: "The ELODIE survey for northern extra-solar planets III: Three planetary candidates detected with ELODIE"
    D. Naef, M. Mayor, J.-L. Beuzit, C. Perrier, D. Queloz, J.-P. Sivan, S. Udry, 2004
    A&A 414, 351 (ADS)
    • April 4th 2001 ESO Press Release

    ELODIE (red dots) and CORALIE (green dots) velocities.
    a: Phase-folded 51.64-day modulation induced by HD 74156 b
    b: Long-period HD 74156 c signal. c: Residuals around the solution.
    Larger image


  • 3-planet orbital solution combining HET, ELODIE & CORALIE data (Robust solution from Bean et al. 2007):

    Object
    Period
    [days]
    T0
    [JD - 2 400 000]
    Eccentricity
    Omega
    [deg]
    K1
    [m/s]
    m2sini
    [M_Jup]
    N
    Residuals
    [m/s]
    HD 74156 b
    51.65 +/- 0.01
    51980.8 +/- 0.1
    0.64 +/- 0.01
    175.8 +/- 1.4
    115.1 +/- 1.5
    1.88 +/- 0.03
    82 (HET) +
    48 (ELODIE) +
    38 (CORALIE)
    6.0 (HET)
    9.5 (Elodie)
    11.1 (Coralie)
    HD 74156 c
    2476.7 +/- 8.7
    50952.2 +/- 13.8
    0.43+/- 0.01
    261.3 +/- 2.0
    115.5 +/- 2.3
    8.03 +/- 0.12
    "
    "
    HD 74156 d
    346.6 +/- 3.6
    50678.2 +/- 44.2
    0.25 +/- 0.11
    166.5 +/- 27.4
    10.5 +/- 1.2
    0.40
    "
    "


  • 2-planet orbital solution (from Naef et al. 2004):

    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 74156 b
    51.643 +/- 0.011
    51981.321 +/- 0.091
    0.636 +/- 0.009
    3.840 +/- 0.003
    181.5 +/- 1.4
    0.1120 +/- 0.0019
    1.86
    0.294
    51 (Elodie) +
    44 (Coralie
    14.0 (Elodie)
    8.9 (Coralie)
    HD 74156 c
    2025 +/- 11
    50901 +/- 10
    0.583 +/- 0.039
    "
    242.4 +/- 4.0
    0.1040 +/- 0.0055
    6.17
    3.40
    "
    "


  • Stellar properties:

    Parameter
    Value
    Reference
    Sp. Type
    G0
    Hipparcos
    pi [mas]
    15.49
    Hipparcos
    d [pc]
    64.56
    Hipparcos
    m_v [mag]
    7.61
    Hipparcos
    B-V [mag]
    0.585
    Hipparcos
    T_eff [K]
    6105 +/- 50
    Santos et al. 2003
    M_v [mag]
    3.56
    -
    L [L_Sun]
    3.06
    -
    log(g) [CGS]
    4.40 +/- 0.15
    Santos et al. 2003
    M_1 [M_Sun]
    1.27
    Santos et al. 2003
    Vsini [km/s]
    4.06 +/- 0.62
    Elodie, Naef et al. 2004
    [Fe/H]
    0.15 +/- 0.06
    Santos et al. 2003
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    stephane.udry@obs.unige.ch