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  A 6.3 Jupiter-mass planet around HD 178911 B

The 3-Sun planet


  Last update: March the 5th 2005

 
 
 
  • "A Planet in the Stellar Triple System HD 178911"
    S. Zucker, D. Naef, D.W. Latham, M. Mayor, T. Mazeh, J.-L Beuzit, G.A. Drukier, C. Perrier, D. Queloz, J.-P. Sivan, G. Torres, S. Udry, 2002
    ApJ 568, 363 (ADS)
  • April 4th 2001 ESO Press Release


  • A Multiple System:
  • HD 178911 A and B is a visual binary with a projected separation of about 640 AU

  • HD 178911 Aa and Ab is a spectroscopic binary with a period of 3.55 years (Tokovinin et al. 2000, AstL 26, 116)
    •


  • The G Dwarf HIRES-ELODIE Planet Search:
  • Teams members:
      CfA: Dave Latham, Guillermo Torres
      Geneva: Michel Mayor, Dominique Naef, Didier Queloz, Stephane Udry
      Grenoble: Christian Perrier-Bellet, Jean-Luc Beuzit
      OHP: Jean-Pierre Sivan
      Tel Aviv: Tsevi Mazeh, Gordon Drukier, Shay Zucker

    • Spectrographs/Telescopes:



      • Hires data: green open circles; Elodie data: red filled circles
      Top: Best Keplerian fit to the Hires-Elodie data
      Bottom: Residuals around the fitted solution
      Larger image (373 kb)


    • Orbital solution (from Zucker et al. 2002):

      Object
      Period
      (days)
      T0
      (JD - 2 400 000)
      Eccentricity
      V
      (km/s)
      Omega
      (deg)
      K1
      (km/s)
      delta_V
      (Hires-Elodie)
      (km/s)
      m2sini
      (M_Jup)
      a
      (AU)
      N
      Residuals
      (m/s)
      HD 178911 B
      71.487 +/- 0.018
      50305.70 +/- 0.62
      0.1243 +/- 0.0075
      -40.4138 +/- 0.0018
      169.8 +/- 3.6
      0.3393 +/- 0.0031
      -40.4886 +/- 0.0053
      6.292
      0.32
      44 (Elodie) +
      7 (Hires)
      11.0


    • Stellar properties:

      Parameter
      Value
      Reference
      Sp. Type
      G5
      Hipparcos
      pi (mas)
      21.40
      Hipparcos
      d (pc)
      46.73
      Hipparcos
      m_v (mag)
      7.97
      Hipparcos
      B-V (mag)
      0.75
      Hipparcos
      T_eff (K)
      5650 +/- 80
      Zucker et al. 2002
      M_v (mag)
      4.62
      -
      L (L_sol)
      1.3
      -
      log(g) (CGS)
      4.65 +/- 0.15
      Zucker et al. 2002
      M_1 (M_sol)
      0.87
      Tokovinin et al. 2000
      log(R'HK)
      -
      -
      P_rot (d)
      -
      -
      Vsini (km/s)
      1.4
      Elodie
      Age (Gyr)
      -
      -
      [Fe/H]
      0.28 +/- 0.08
      Zucker et al. 2002

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      stephane.udry@obs.unige.ch