J/A+A/625/A136ivo://CDS.VizieR/J/A+A/625/A136doi:10.26093/cds/vizier.36250136CDSArcangeli J.Desert J.-M.Parmentier V.Stevenson K.B.Bean J.L.,Line M.R.Kreidberg L.Fortney J.J.Showman A.P.2019-06-24T13:23:13Z2019-05-28T10:25:43ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsinfrared-astronomyspectroscopyWe present the analysis of a full-orbit, spectroscopic phase curve of the ultra hot Jupiter (UHJ) WASP-18b, obtained with the Wide Field Camera 3 aboard the Hubble Space Telescope. We measured the normalised day-night contrast of the planet as >0.96 in luminosity: the disc-integrated dayside emission from the planet is at 964+/-25ppm, corresponding to 2894+/-30K, and we place an upper limit on the nightside emission of <32ppm or 1430K at the 3{sigma}level. We also find that the peak of the phase curve exhibits a small, but significant oset in brightness of 4.5+/-0.5 degrees eastward. We compare the extracted phase curve and phase-resolved spectra to 3D global circulation models and find that broadly the data can be well reproduced by some of these models. We find from this comparison several constraints on the atmospheric properties of the planet. Firstly we find that we need ecient drag to explain the very inefficient day-night recirculation observed.We demonstrate that this drag could be due to Lorentz-force drag by a magnetic field as weak as 10 gauss. Secondly, we show that a high metallicity is not required to match the large day-night temperature contrast. In fact, the effect of metallicity on the phase curve is different from cooler gas-giant counterparts because of the high-temperature chemistry in the atmosphere of WASP-18b. Additionally, we compared the current UHJ spectroscopic phase curves, WASP-18b and WASP-103b, and show that these two planets provide a consistent picture with remarkable similarities in their measured and inferred properties. However, key differences in these properties, such as their brightness osets and radius anomalies, suggest that UHJ could be used to separate between competing theories for the inflation of gas-giant planets.2019A&A...625A.136Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/625/A136CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/625/A136https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/625/A136http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/625/A136https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/625/A136https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/625/A136http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/625/A136GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/A+A/625/A136/w114_117Phase curve between 1.14-1.17 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w117_121Phase curve between 1.17-1.21 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w121_124Phase curve between 1.21-1.24 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w124_127Phase curve between 1.24-1.27 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w134_137Phase curve between 1.34-1.37 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w137_140Phase curve between 1.37-1.40 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w144_147Phase curve between 1.44-1.47 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w150_153Phase curve between 1.50-1.53 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w153_157Phase curve between 1.53-1.57 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w157_160Phase curve between 1.57-1.60 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w127_130Phase curve between 1.27-1.30 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w130_134Phase curve between 1.30-1.34 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w140_144Phase curve between 1.40-1.44 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdoubleJ/A+A/625/A136/w147_150Phase curve between 1.47-1.50 micronrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime at which each exposure was takendtime.epochdoubleFluxNormalised flux of the systemphot.flux;arith.ratiodoublee_FluxUncertainty on the measured fluxstat.error;phot.fluxdouble