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  WASP-4b: A transiting hot Jupiter
  Last update: April 7 2008

 
 
  • "WASP-4b: A 12th Magnitude Transiting Hot Jupiter in the Southern Hemisphere"
    D.M. Wilson, M. Gillon, C. Hellier, P.F.L. Maxted, F. Pepe, D. Queloz, D.R. Anderson, A. Collier Cameron, B. Smalley, T.A. Lister, S.J. Bentley, A. Blecha, D.J. Christian, B. Enoch, C.A. Haswell, L. Hebb, K. Horne, J. Irwin, Y.C. Joshi, S.R. Kane, M. Marmier, M. Mayor, N. Parley, D. Pollacco, F. Pont, R. Ryans, D. Ségransan, I. Skillen, R.A. Street, S. Udry, R.G. West, P.J. Wheatley, P. J., 2008
    ApJ 675, L116 (ADS) --> Transit light curve & RV orbit


    •  
    WASP-4 Photometric data and fitted transit curves
    Top:SuperWASP data Middle: Faulkes Telescope South data
    Bottom: Euler La Silla Swiss telescope data.
    Larger image
     
     
     
    WASP-4 radial-velocity data obtained with CORALIE
    Larger image


  • Orbital solution (from Wilson et al. 2008):

    Object
    Period
    [days]
    T_trans
    [JD - 2400000]
    Eccentricity
    V
    [km/s]
    Omega
    [deg]
    K1
    [m/s]
    a
    [AU]
    N
    Residuals
    [m/s]
    WASP-4b
    1.3382282
    +/-
    0.000003
    54365.91464
    +0.00025 /-0.00023
    0.0 (fixed)
    57.7326
    +0.002 /-0.001
    0.0 (fixed)
    240
    +/- 10
    0.023
    +/-0.001
    14
    15.3


  • Other parameters (from Wilson et al. 2008):

    Planet mass
    [M_Jup]
    1.215 +0.087 /-0.079
    Planet radius
    [R_Jup]
    1.416 +0.068 /-0.043
    Planet density
    [rho_Jup]
    0.428 +0.032 /-0.044
    Planet surface gravity (log scale)
    [CGS]
    3.142 +0.023 /-0.034
    Planet equ. temperature (Albedo=0)
    [K]
    1761 +24 /-9
    Orbital inclination
    [deg]
    88.58 +1.36 /- 1.50
    Impact parameter
    -
    0.13 +0.13 /- 0.12
    Transit duration
    [d]
    0.0928 +0.0009 /- 0.0007


  • Stellar properties:

    Parameter
    Value
    Reference
    Sp. Type
    G7V
    Wilson et al. 2008
    m_v [mag]
    12.5
    Wilson et al. 2008
    Distance [pc]
    300 +/- 50
    Wilson et al. 2008
    T_eff [K]
    5500 +/- 150
    Wilson et al. 2008
    log(g) [CGS]
    4.45 +0.016 /-0.029
    Wilson et al. 2008
    M_1 [M_Sun]
    0.8997 +0.077 /-0.072
    Wilson et al. 2008
    [M/H]
    0.0 +/- 0.2
    Wilson et al. 2008
    R [R_Sun]
    0.9370 +0.04 /- 0.03
    Wilson et al. 2008
    Vsini [km/s]
    2.2 +0.6 /-1.0
    Wilson et al. 2008


  • Links:
  • superWASP home page

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    stephane.udry@obs.unige.ch