J/AJ/137/3826ivo://CDS.VizieR/J/AJ/137/3826doi:10.26093/cds/vizier.51373826CDSWinn J.N.Holman M.J.Carter J.A.Torres G.Osip D.J.Beatty T.2009-09-20T09:55:30Z2009-09-20T09:48:52ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frvariable-starssolar-system-planetsphotometryWe 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+/-0.064M_Jup_ and 1.365+/-0.021R_Jup_, 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.2009AJ....137.3826Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/137/3826CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/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)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/137/3826https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/137/3826http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/137/3826https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/137/3826https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/137/3826http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/137/3826GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/137/3826/table1Relative Photometry of WASP-4recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date at midexposuretime.epochdoubleRfluxRelative fluxphot.flux;arith.ratiodoublee_RfluxUncertainty in Rflux (discussed in Sec. 3)stat.errordouble