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  HD 33636 b: a low-mass star on a nearly face-on orbit


  Last update: May 19th 2007

 
 
 
  • Astrometric signature detected by Bean et al. (2007) using the HST-FGS. The orbit has a very low inclination (4.1 deg). The true mass of the companion is 0.14 M_Sun (M-dwarf companion)
  • Detection of the astrometric signature and updates RV orbit:
    "The Mass of the Candidate Exoplanet Companion to HD 33636 from Hubble Space Telescope Astrometry and High-Precision Radial Velocities"
    J.L. Bean, B.E. McArthur, F.G. Benedict, T.E. Harrison, D. Bizyaev, E. Nelan, V.V. Smith, 2007
    ApJ submitted (astro-ph/0705.1861)
  • RV detections:
    "The ELODIE survey for northern extra-solar I. Six new extra-solar planet candidates"
    C. Perrier, J.-P. Sivan, D. Naef, J.-L. Beuzit, M. Mayor, D. Queloz, S. Udry, 2003
    A&A 410, 1039 (ADS)
  • "Ten Low-Mass Companions from the Keck Precision Velocity Survey"
    S.S. Vogt, R.P. Butler, G.W. Marcy, D.A. Fischer, D. Pourbaix, K. Apps, G. Laughlin, 2002
    ApJ 568, 352 (ADS)

    • Elodie + Coralie orbital solution (black curve).
    Elodie data: red triangles; Coralie data:green dots.
    Blue dotted line: solution in Vogt et al. 2002
    Larger image (371 kb)


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

    Object
    Period
    (days)
    T0
    (JD - 2 400 000)
    Eccentricity
    omega
    (deg)
    Omega
    (deg)
    K1
    (m/s)
    i
    (deg)
    m2sini
    (M_Jup)
    m2
    (M_Jup)
    HD 33636 b
    2117.3 +/- 0.8
    51198.3 +/- 2.0
    0.48 +/- 0.02
    337.0 +/- 1.6
    125.6 +/- 1.6
    163.5 +/- 0.6
    4.0 +/- 0.1
    9.9 +/- 0.8
    142 +/- 11


  • Orbital solution (from Perrier et al. 2003):

    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 33636
    2928 +1090/-525
    51211 +/- 22
    0.55 +/- 0.10
    5.629 +/- 0.035
    340.2 +/- 6.1
    0.168 +/- 0.015
    10.58
    4.08
    42 (ELODIE) +
    5 (CORALIE)
    10.2 (ELODIE)
    3.6 (CORALIE)


  • Stellar properties:

    Parameter
    Value
    Reference
    Sp. Type
    G0
    Hipparcos
    pi (mas)
    34.85
    Hipparcos
    d (pc)
    28.7
    Hipparcos
    m_v (mag)
    7.0
    Hipparcos
    B-V (mag)
    0.588
    Hipparcos
    T_eff (K)
    5990 +/- 50
    Santos et al. 2003
    M_v (mag)
    4.71
    -
    L (L_sol)
    1.07
    -
    log(g) (CGS)
    4.68 +/- 0.15
    Santos et al. 2003
    M_1 (M_sol)
    1.12
    Santos et al. 2003
    log(R'HK)
    -4.81
    Vogt et al. 2002
    P_rot (d)
    14.3
    Noyes et al. 1984
    Vsini (km/s)
    2.79 +/- 0.65
    Elodie, Perrier et al. 2003
    Age (Gyr)
    2.8
    Donahue 1993
    [Fe/H]
    -0.05 +/- 0.07
    Santos et al. 2003


  • Links:
  • HD 33636 @ exoplanets.org (independant discovery)

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    stephane.udry@obs.unige.ch