J/A+A/620/A46ivo://CDS.VizieR/J/A+A/620/A46doi:10.26093/cds/vizier.36200046CDSMueller B.Giuliano B.M.Bizzocchi L.Vasyunin A.I.Caselli P.2018-11-30T09:06:49Z2018-11-28T08:09:52ZCDS support team

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

cds-question@unistra.frinterstellar-mediuminfrared-astronomyspectroscopyIn this paper we investigate the detectability of the molecular oxygen in icy dust grain mantles towards astronomical objects. We present a systematic set of experiments with O_2_-H_2_O ice mixtures designed to disentangle how the molecular ratio affects the O_2_ signature in the mid- and near-infrared spectral regions. All the experiments were conducted in a closed-cycle helium cryostat coupled to a Fourier transform infrared spectrometer. The ice mixtures comprise varying thicknesses from 8x10^-3^ to 3um. The absorption spectra of the O_2_-H_2_O mixtures are also compared to the one of pure water. In addition, the possibility to detect the O_2_ in icy bodies and in the interstellar medium is discussed. We are able to see the O_2_ feature at 1551cm^-1^ even for the most diluted mixture of H_2_O:O_2_=9:1, comparable to a ratio of O_2_/H_2_O=10% which has already been detected in situ in the coma of the comet 67P/Churyumov-Gerasimenko. We provide an estimate for the detection of O_2_ with the future mission of the James Webb Space Telescope (JWST).2018A&A...620A..46Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/620/A46CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/620/A46https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/620/A46http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/620/A46https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/620/A46https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/620/A46http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/620/A46GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/A+A/620/A46/listList of absorption spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintspShow the absorption spectrummeta.ref.urlcharFileNameName of the file in subdirectory o2-h2o-icemeta.id;meta.filecharTitleTitle of the absorption spectrum filemeta.title;phys.absorption;meta.file