J/A+A/608/A26ivo://CDS.VizieR/J/A+A/608/A26doi:10.26093/cds/vizier.36080026CDSMackebrandt F.Mallonn M.Ohlert J.M.Granzer T.Lalitha S.,Garcia Munoz A.Gibson N.P.Lee J.W.Sozzetti A.Turner J.D.Vanko M.,Strassmeier K.G.2020-02-14T05:23:06Z2017-12-01T11:20:23ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsinfrared-photometryvisible-astronomyWide-band photometrysloan-photometryTransit events of extrasolar planets offer the opportunity to study the composition of their atmospheres. Previous work on transmission spectroscopy of the close-in gas giant TrES-3 b revealed an increase in absorption towards blue wavelengths of very large amplitude in terms of atmospheric pressure scale heights, too large to be explained by Rayleigh- scattering in the planetary atmosphere. We present a follow-up study of the optical transmission spectrum of the hot Jupiter TrES-3 b to investigate the strong increase in opacity towards short wavelengths found by a previous study. Furthermore, we aim to estimate the effect of stellar spots on the transmission spectrum. This work uses previously published long slit spectroscopy transit data of the Gran Telescopio Canarias (GTC) and published broad band observations as well as new observations in different bands from the near-UV to the near-IR, for a homogeneous transit light curve analysis. Additionally, a long-term photometric monitoring of the TrES-3 host star was performed. Our newly analysed GTC spectroscopic transit observations show a slope of much lower amplitude than previous studies. We conclude from our results the previously reported increasing signal towards short wavelengths is not intrinsic to the TrES-3 system. Furthermore, the broad band spectrum favours a flat spectrum. Long-term photometric monitoring rules out a significant modification of the transmission spectrum by unocculted star spots.2017A&A...608A..26Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/608/A26CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/136/267 : Six occultations of the exoplanet TrES-3 (Winn+, 2008)J/ApJ/691/1145 : Spectrophotometry of TrES-3 and TrES-4 (Sozzetti+, 2009)J/MNRAS/408/1494 : Planetary transits of TrES-2 and TrES-3 (Colon+, 2010)J/AJ/145/68 : Five new transit light curves of TrES-3 (Jiang+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/608/A26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/608/A26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/608/A26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/608/A26https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/608/A26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/608/A26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/A+A/608/A26/listList of photometric observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[UBVI z'] Observed bandinstr.bandpasscharPSys[Johnson Sloan] Photometric system of the Bandmeta.id;photcharInstInstrumentmeta.id;instrcharObs.DateObservation datetime.epoch;obsnullableCadCadences**-1obs.paramintNobsNumber of data pointsmeta.numberintrmsDispersion of the residuals as root mean square (rms) of the observations after subtracting a transit modelmmag**-1instr.det.noisefloatLCShow the light curvemeta.ref.urlcharFileNameName of the table with photometry in subdirectory photmeta.id;phot;meta.tablecharJ/A+A/608/A26/vamosbLight curve from STELLA in Johnson B filterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian date in UTC (JD-2400000)dtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodoublee_FluxError of Fluxstat.error;phot.fluxdoubleJ/A+A/608/A26/vamosvLight curve from STELLA in Johnson V filterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian date in UTC (JD-2400000)dtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodoublee_FluxError of Fluxstat.error;phot.fluxdouble