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J/AJ/137/3826       Two transits of the giant planet WASP-4b (Winn+, 2009)
The transit light curve project.
XI. Submillimagnitude photometry of two transits of the bloated planet WASP-4b.
    Winn J.N., Holman M.J., Carter J.A., Torres G., Osip D.J., Beatty T.
   <Astron. J., 137, 3826-3833 (2009)>
   =2009AJ....137.3826W
ADC_Keywords: Stars, variable ; Planets ; Photometry

Keywords: planetary systems - stars: individual: WASP-4 = USNO-B1.0 0479-0948995


Abstract:
    We present photometry of two transits of the giant planet WASP-4b with
    a photometric precision of 400-800 parts per million and a time
    sampling of 25-40s. The two midtransit times are determined to within
    6s. Together with previously published times, the data are consistent
    with a constant orbital period, giving no compelling evidence for
    period variations that would be produced by a satellite or additional
    planets. Analysis of the new photometry, in combination with
    stellar-evolutionary modeling, gives a planetary mass and radius of
    1.237±0.064MJup and 1.365±0.021RJup, respectively. The planet
    is 15% larger than expected based on previously published models of
    solar-composition giant planets. With data of the quality presented
    here, the detection of transits of a "super-Earth" of radius
    1.75R{earth} would have been possible.

Description:
    We observed the transits of UT 2008 August 19 and 2008 October 9 with
    the Baade 6.5 m telescope, one of the two Magellan telescopes at Las
    Campanas Observatory in Chile.
Objects:
    -------------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    -------------------------------------------------------------
    23 34 15.1   -42 03 41   WASP-4 = 1SWASP J233415.06-420341.1
    -------------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        32      713   Relative Photometry of WASP-4


See also:
    J/ApJ/652/1715 : Four transits of the exoplanet XO-1b (Holman+, 2006)
    J/AJ/133/11    : Photometry of OGLE-TR 111 (Winn+, 2007)
    J/ApJ/657/1098 : Transit of TrES-1 (Winn+, 2007)
    J/ApJ/655/1103 : Five transits of the exoplanet OGLE-TR-10b (Holman+, 2007)
    J/AJ/133/1828  : Transit light curves of HD 189733 (Winn+, 2007)
    J/ApJ/664/1185 : Three transits of the exoplanet TrES-2 (Holman+, 2007)
    J/AJ/134/1707  : Six transit of exoplanet HAT-P-1b (Winn+, 2007)
    J/AJ/136/267   : Six occultations of the exoplanet TrES-3 (Winn+, 2008)
    J/ApJ/683/1076 : Transits of exoplanet XO-3b (Winn+, 2008)
    J/ApJ/693/794  : Transit of exoplanet HD 17156b (Winn+, 2009)
    J/AJ/137/4911  : Six transits of the exoplanet XO-2b (Fernandez+, 2009)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1- 14  F14.6 ---     BJD       Barycentric Julian Date at midexposure
  16- 23  F8.6  ---     Rflux     Relative flux
  25- 32  F8.6  ---     e_Rflux   Uncertainty in Rflux (discussed in Sec. 3)


History:
    From electronic version of the journal

References:
  Holman et al.,    Paper I      2006ApJ...652.1715H, Cat. J/ApJ/652/1715
  Winn et al.,      Paper II     2007AJ....133...11W, Cat. J/AJ/133/11
  Winn et al.,      Paper III    2007ApJ...657.1098W, Cat. J/ApJ/657/1098
  Holman et al.,    Paper IV     2007ApJ...655.1103H, Cat. J/ApJ/655/1103
  Winn et al.,      Paper V      2007AJ....133.1828W, Cat. J/AJ/133/1828
  Holman et al.     Paper VI     2007ApJ...664.1185H, Cat. J/ApJ/664/1185
  Winn et al.,      Paper VII    2007AJ....134.1707W, Cat. J/AJ/134/1707
  Winn et al.,      Paper VIII   2008AJ....136..267W, Cat. J/AJ/136/267
  Winn et al.,      Paper IX     2008ApJ...683.1076W, Cat. J/ApJ/683/1076
  Winn et al.,      Paper X      2009ApJ...693..794W, Cat. J/ApJ/693/794
  Winn et al.,      Paper XI     2009AJ....137.3826W, Cat. J/AJ/137/3826
  Fernandez et al., Paper XII    2009AJ....137.4911F, Cat. J/AJ/137/4911
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    09-Aug-2009