J/ApJ/790/53ivo://CDS.VizieR/J/ApJ/790/53doi:10.26093/cds/vizier.17900053CDSZellem R.T.Lewis N.K.Knutson H.A.Griffith C.A.Showman A.P.,Fortney J.J.Cowan N.B.Agol E.Burrows A.Charbonneau D.Deming D.,Laughlin G.Langton J.2017-06-21T08:21:48Z2017-03-23T16:06:15ZCDS support team

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

cds-question@unistra.frphotometrymultiple-starssolar-system-planetsThe hot Jupiter HD 209458b is particularly amenable to detailed study as it is among the brightest transiting exoplanet systems currently known (V-mag = 7.65; K-mag = 6.308) and has a large planet-to-star contrast ratio. HD 209458b is predicted to be in synchronous rotation about its host star with a hot spot that is shifted eastward of the substellar point by superrotating equatorial winds. Here we present the first full-orbit observations of HD 209458b, in which its 4.5 {mu}m emission was recorded with Spitzer/IRAC. Our study revises the previous 4.5 {mu}m measurement of HD 209458b's secondary eclipse emission downward by ~35% to 0.1391%_-0.0069%_^+0.0072^%, changing our interpretation of the properties of its dayside atmosphere. We find that the hot spot on the planet's dayside is shifted eastward of the substellar point by 40.{deg}9+/-6.{deg}0, in agreement with circulation models predicting equatorial superrotation. HD 209458b's dayside (T_bright_= 1499+/-15 K) and nightside (T_bright_= 972+/-44 K) emission indicate a day-to-night brightness temperature contrast smaller than that observed for more highly irradiated exoplanets, suggesting that the day-to-night temperature contrast may be partially a function of the incident stellar radiation. The observed phase curve shape deviates modestly from global circulation model predictions potentially due to disequilibrium chemistry or deficiencies in the current hot CH_4_ line lists used in these models. Observations of the phase curve at additional wavelengths are needed in order to determine the possible presence and spatial extent of a dayside temperature inversion, as well as to improve our overall understanding of this planet's atmospheric circulation.2014ApJ...790...53Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/790/53CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/508/1509 : Sky maps for hot Jupiters (Heller+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/790/53https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/790/53http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/790/53https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/790/53https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/790/53http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/790/53GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/790/53/table1Photometric dataRFluxRaw, filtered relative fluxphot.flux;arith.ratiodoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date (UTC) - BJD-2455000dtime.epochdoublee_RFluxUncertainty in RFluxstat.errordoubleFFluxFinal, corrected relative fluxphot.flux;arith.ratiodoublee_FFluxUncertainty in FFluxstat.errordouble