J/A+A/672/A24ivo://CDS.VizieR/J/A+A/672/A24doi:10.26093/cds/vizier.36720024CDSKrenn A.F.Lendl M.Patel J.A.Carone L.Deleuil M.Sulis S.,Collier Cameron A.Deline A.Guterman P.Queloz D.Fossati L.,Brandeker A.Heng K.Akinsanmi B.Adibekyan V.Bonfanti A.,Demangeon O.D.S.Kitzmann D.Salmon S.Sousa S.G.Wilson T.G.,Alibert Y.Alonso R.Anglada G.Barczy T.Barrado Navascues D.,Barros S.C.C.Baumjohann W.Beck M.Beck T.Benz W.Billot N.,Blecha L.Bonfils X.Borsato L.Broeg C.Cabrera J.Charnoz S.,Corral van Damme C.Csizmadia Sz.Cubillos P.E.Davies M.B.Delrez L.,Demory B.-O.Ehrenreich D.Erikson A.Farinato J.Fortier A.,Fridlund M.Gandolfi D.Gillon M.Guedel M.Hoyer S.Isaak K.G.,Kiss L.L.Kopp E.Laskar J.Lecavelier des Etangs A.Lovis C.,Magrin D.Maxted P.F.L.Mordasini C.Nascimbeni V.Olofsson G.,Ottensamer R.Pagano I.Palle E.Peter G.Piotto G.Pollacco D.,Ragazzoni R.Rando N.Rauer H.Ribas I.Santos N.C.Scandariato G.,Segransan D.Simon A.E.Smith A.M.S.Steller M.Szabo Gy.M.Thomas N.,Udry S.Ulmer B.Van Grootel V.Venturini J.Walton N.A.2024-11-06T20:03:35Z2023-03-28T09:06:00ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsphotometryMeasurements of the occultation of an exoplanet at visible wavelengths allow the reflective properties of a planetary atmosphere to be determined. The observed occultation depth can be translated into a geometric albedo. This in turn aids in characterising the structure and composition of an atmosphere by providing additional information on the wavelength-dependent reflective qualities of the aerosols in the atmosphere. Our aim is to provide a precise measurement of the geometric albedo of the gas giant HD 189733b by measuring the occultation depth in the broad optical bandpass of CHEOPS (350-1100nm). We analysed 13 observations of the occultation of HD 189733b performed by CHEOPS utilising the Python package PyCHEOPS. The resulting occultation depth is then used to infer the geometric albedo accounting for the contribution of thermal emission from the planet. We also aid the analysis by refining the transit parameters combining observations made by the TESS and CHEOPS space telescopes. We report the detection of an 24.7+/-4.5ppm occultation in the CHEOPS observations. This occultation depth corresponds to a geometric albedo of 0.076+/-0.016. Our measurement is consistent with models assuming the atmosphere of the planet to be cloud-free at the scattering level and absorption in the CHEOPS band to be dominated by the resonant Na doublet. Taking into account previous optical-light occultation observations obtained with the Hubble Space Telescope, both measurements combined are consistent with a super-stellar Na elemental abundance in the dayside atmosphere of HD 189733b. We further constrain the planetary Bond albedo to between 0.013 and 0.42 at 3-sigma confidence.2023A&A...672A..24Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/672/A24CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/619/A96 : HD189733 spectral variability (Kohl+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/672/A24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/672/A24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/672/A24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/672/A24https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/672/A24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/672/A24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/672/A24/ch1Raw CHEOPS photometric time series with auxiliary detrending vectorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTime of mid-exposure (BJD)dtime.epochdoubleindexedNFluxNormalised raw fluxphot.fluxdoublee_NFlux1-sigma uncertainty in nfluXstat.errordoubleRollSpacecraft roll angledeginstr.offsetdoubleCenXx-centroid positionpixpos.cartesian.x;instr.detdoubleCenYy-centroid positionpixpos.cartesian.y;instr.detdoubleBgFraction of flux in aperture from backgroundinstr.backgrounddoubleContamFraction of flux in aperture from nearby starsinstr.paramdoublesmearFraction of flux in aperture from readout trailsinstr.paramdoubleJ/A+A/672/A24/ch2Detrended CHEOPS light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTime of mid-exposure (BJD)dtime.epochdoubleNFlux-detNormalised detrended fluxphot.flux;arith.ratiodoublee_NFlux-det1-sigma uncertainty in NFlux-detstat.errordoubleJ/A+A/672/A24/te1Detrended TESS light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTime of mid-exposure (BJD)dtime.epochdoubleindexedNFlux-detNormalised detrended fluxphot.flux;arith.ratiodoublee_NFlux-det1-sigma uncertainty in NFlux-detstat.errordouble