J/MNRAS/468/3907ivo://CDS.VizieR/J/MNRAS/468/3907doi:10.26093/cds/vizier.74683907CDSKirk J.Wheatley P.J.Louden T.Doyle A.P.Skillen I.McCormac J.,Irwin P.G.J.Karjalainen R.2024-08-17T20:18:45Z2017-06-20T08:53:48ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsspectroscopyWe have performed ground-based transmission spectroscopy of the hot Jupiter HAT-P-18b using the ACAM instrument on the William Herschel Telescope (WHT). Differential spectroscopy over an entire night was carried out at a resolution of R~400 using a nearby comparison star. We detect a bluewards slope extending across our optical transmission spectrum which runs from 4750{AA} to 9250{AA}. The slope is consistent with Rayleigh scattering at the equilibrium temperature of the planet (852K). We do not detect enhanced sodium absorption, which indicates a high altitude haze is masking the feature and giving rise to the Rayleigh slope. This is only the second discovery of a Rayleigh scattering slope in a hot Jupiter atmosphere from the ground, and our study illustrates how ground-based observations can provide transmission spectra with precision comparable to the Hubble Space Telescope (HST).2017MNRAS.468.3907Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/468/3907CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/726/52 : HAT-P-18 and HAT-P-19 follow-up (Hartman+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/468/3907https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/468/3907http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/468/3907https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/468/3907https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/468/3907http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/468/3907GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/468/3907/table1Reduced light curves with time and airmassrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleAirmassMean effective airmassobs.airMassfloatFWlightNormalised white light fluxphot.flux;arith.ratiodoublee_FWlightNormalised white light errorstat.errordoubleF4875ANormalised flux in 250{AA}-wide bin centred on 4875{AA}phot.flux;arith.ratiodoublee_F4875ANormalised error in 250{AA}-wide bin centred on 4875{AA}stat.errordoubleF5125ANormalised flux in 250{AA}-wide bin centred on 5125{AA}phot.flux;arith.ratiodoublee_F5125ANormalised error in 250{AA}-wide bin centred on 5125{AA}stat.errordoubleF5375ANormalised flux in 250{AA}-wide bin centred on 5375{AA}phot.flux;arith.ratiodoublee_F5375ANormalised error in 250{AA}-wide bin centred on 5375{AA}stat.errordoubleF5625ANormalised flux in 250{AA}-wide bin centred on 5625{AA}phot.flux;arith.ratiodoublee_F5625ANormalised error in 250{AA}-wide bin centred on 5625{AA}stat.errordoubleF5875ANormalised flux in 250{AA}-wide bin centred on 5875{AA}phot.flux;arith.ratiodoublee_F5875ANormalised error in 250{AA}-wide bin centred on 5875{AA}stat.errordoubleF6125ANormalised flux in 250{AA}-wide bin centred on 6125{AA}phot.flux;arith.ratiodoublee_F6125ANormalised error in 250{AA}-wide bin centred on 6125{AA}stat.errordoubleF6375ANormalised flux in 250{AA}-wide bin centred on 6375{AA}phot.flux;arith.ratiodoublee_F6375ANormalised error in 250{AA}-wide bin centred on 6375{AA}stat.errordoubleF6625ANormalised flux in 250{AA}-wide bin centred on 6625{AA}phot.flux;arith.ratiodoublee_F6625ANormalised error in 250{AA}-wide bin centred on 6625{AA}stat.errordoubleF6875ANormalised flux in 250{AA}-wide bin centred on 6875{AA}phot.flux;arith.ratiodoublee_F6875ANormalised error in 250{AA}-wide bin centred on 6875{AA}stat.errordoubleF7125ANormalised flux in 250{AA}-wide bin centred on 7125{AA}phot.flux;arith.ratiodoublee_F7125ANormalised error in 250{AA}-wide bin centred on 7125{AA}stat.errordoubleF7375ANormalised flux in 250{AA}-wide bin centred on 7375{AA}phot.flux;arith.ratiodoublee_F7375ANormalised error in 250{AA}-wide bin centred on 7375{AA}stat.errordoubleF7875ANormalised flux in 250{AA}-wide bin centred on 7875{AA}phot.flux;arith.ratiodoublee_F7875ANormalised error in 250{AA}-wide bin centred on 7875{AA}stat.errordoubleF8125ANormalised flux in 250{AA}-wide bin centred on 8125{AA}phot.flux;arith.ratiodoublee_F8125ANormalised error in 250{AA}-wide bin centred on 8125{AA}stat.errordoubleF8375ANormalised flux in 250{AA}-wide bin centred on 8375{AA}phot.flux;arith.ratiodoublee_F8375ANormalised error in 250{AA}-wide bin centred on 8375{AA}stat.errordoubleF8625ANormalised flux in 250{AA}-wide bin centred on 8625{AA}phot.flux;arith.ratiodoublee_F8625ANormalised error in 250{AA}-wide bin centred on 8625{AA}stat.errordoubleF8875ANormalised flux in 250{AA}-wide bin centred on 8875{AA}phot.flux;arith.ratiodoublee_F8875ANormalised error in 250{AA}-wide bin centred on 8875{AA}stat.errordoubleF9125ANormalised flux in 250{AA}-wide bin centred on 9125{AA}phot.flux;arith.ratiodoublee_F9125ANormalised error in 250{AA}-wide bin centred on 9125{AA}stat.errordouble