J/ApJ/795/166ivo://CDS.VizieR/J/ApJ/795/166doi:10.26093/cds/vizier.17950166CDSCrouzet N.McCullough P.R.Deming D.Madhusudhan N.2017-07-18T15:31:03Z2017-06-02T14:11:06ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsSpectroscopic observations of exoplanets are crucial to infer the composition and properties of their atmospheres. HD 189733b is one of the most extensively studied exoplanets and is a cornerstone for hot Jupiter models. In this paper, we report the dayside emission spectrum of HD 189733b in the wavelength range 1.1-1.7 {mu}m obtained with the Hubble Space Telescope Wide Field Camera 3 (WFC3) in spatial scan mode. The quality of the data is such that even a straightforward analysis yields a high-precision Poisson noise-limited spectrum: the median 1{sigma} uncertainty is 57 ppm per 0.02 {mu}m bin. We also build a white-light curve correcting for systematic effects and derive an absolute eclipse depth of 96+/-39 ppm. The resulting spectrum shows marginal evidence for water vapor absorption, but can also be well explained by a blackbody spectrum. However, the combination of these WFC3 data with previous Spitzer photometric observations is best explained by a dayside atmosphere of HD 189733b with no thermal inversion and a nearly solar or subsolar H_2_O abundance in a cloud-free atmosphere. Alternatively, this apparent subsolar abundance may be the result of clouds or hazes that future studies need to investigate.2014ApJ...795..166Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/795/166CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/767/64 : Benchmark light curves for exoplanet eclipses (Rogers+, 2013)J/ApJ/791/55 : HD 189733b in transit light curve (McCullough+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/795/166https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/795/166http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/795/166https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/795/166https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/795/166http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/795/166GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/795/166/table3Whitelight curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Date of exposure startdtime.epochdoubleHJDHeliocentric Julian Date of exposure startdtime.epochdoubleOrbit[1/5] HST orbit in the visitmeta.idintScanScan direction (1)instr.offsetintPh-eTotal number of photoelectronsphot.countlongNFluxNormalized flux before detrendingphot.flux;arith.ratiodouble