J/A+A/600/L11ivo://CDS.VizieR/J/A+A/600/L11doi:10.26093/cds/vizier.36009011CDSChen G.Palle E.Nortmann L.Murgas F.Parviainen H.Nowak G.2017-07-03T14:25:56Z2017-04-13T08:27:44ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsspectroscopyWe report the first detection of sodium absorption in the atmosphere of the hot Jupiter WASP-52b. We observed one transit of WASP-52b with the low-resolution Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) at the 10.4m Gran Telescopio Canarias (GTC). The resulting transmission spectrum, covering the wavelength range from 522nm to 903nm, is flat and featureless, except for the significant narrow absorption signature at the sodium doublet, which can be explained by an atmosphere in solar composition with clouds at 1 mbar. A cloud-free atmosphere is stringently ruled out. By assessing the absorption depths of sodium in various bin widths, we find that temperature increases towards lower atmospheric pressure levels, with a positive temperature gradient of 0.88+/-0.65K/km , possibly indicative of upper atmospheric heating and a temperature inversion.2017A&A...600L..11Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/600/L11CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/563/A41 : WASP-43 OSIRIS transmission spectroscopy (Murgas+, 2014)J/A+A/589/A62 : GTC transit light curves of CoRoT-29b (Palle+, 2016)J/A+A/594/A65 : GTC transit light curves of HAT-P-32b (Nortmann+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/600/L11https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/600/L11http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/600/L11https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/600/L11https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/600/L11http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/600/L11GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/600/L11/listList of spectroscopic light curvesTitleTitle of the filemeta.title;meta.filecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLCShow the light curvemeta.ref.urlcharFileNameName of the file with light curve datameta.id;meta.filecharch? Channel number (from table A1)meta.id;instrintnullablelambdac? Center wavelength (from table A1)0.1nmem.wlintnullableWidth? Width of wavelength interval (from table A1)0.1nmem.wlintnullableRp/R*? Planet-to-star radius ratio (from table A1)phys.size;arith.ratiofloatnullablee_Rp/R*? rms uncertainty on Rp/R* (from table A1)stat.errorfloatnullableJ/A+A/600/L11/wlcWASP-52 GTC transit white light curve (2015/08/28)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD-TDBBarycentric Julian Date (TDB standard)dtime.epochdoubleFluxRelative fluxphot.flux;arith.ratiodoublee_FluxUncertainty of relative fluxstat.error;phot.fluxdoubleposXDrift of star on CCD in spatial directionpixpos.cartesian.x;instr.detdoubleposYDrift of star on CCD in dispersion directionpixpos.cartesian.y;instr.detdoubleFWHMxRelative change of full width at half maximum of the stellar absorption line profilepixarith.rate;spect.line.widthdoubleFWHMYFull width at half maximum of the stellar spatial profilepixspect.line.widthdoubleAirMassAirmass during observationobs.airMassdoubleRotAngRotator angle during observationdegpos.posAngdouble