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Sub-millimetre spectroscopy of Saturn's trace gases from Herschel/SPIRE

hal.structure.identifierDepartment of Atmospheric, Oceanic and Planetary Physics [Oxford] [AOPP]
dc.contributor.authorFLETCHER, L. N.
dc.contributor.authorSWINYARD, B.
dc.contributor.authorSALJI, C.
dc.contributor.authorPOLEHAMPTON, E.
dc.contributor.authorFULTON, T.
dc.contributor.authorSIDHER, S.
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA]
dc.contributor.authorLELLOUCH, E.
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA]
dc.contributor.authorMORENO, R.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorORTON, G.
hal.structure.identifierSSE 2012
dc.contributor.authorCAVALIÉ, T.
hal.structure.identifierObservatoire de Paris - Site de Paris [OP]
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA]
dc.contributor.authorCOURTIN, R.
hal.structure.identifierMax-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
dc.contributor.authorRENGEL, M.
dc.contributor.authorSAGAWA, H.
dc.contributor.authorDAVIS, G. R.
hal.structure.identifierMax-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
dc.contributor.authorHARTOGH, P.
dc.contributor.authorNAYLOR, D.
dc.contributor.authorWALKER, H.
dc.contributor.authorLIM, T.
dc.date.issued2012-03
dc.identifier.issn0004-6361
dc.description.abstractEnAims: We provide an extensive new sub-millimetre survey of the trace gas composition of Saturn's atmosphere using the broad spectral range (15-51 cm-1) and high spectral resolution (0.048 cm-1) offered by Fourier transform spectroscopy by the Herschel/SPIRE instrument (Spectral and Photometric Imaging REceiver). Observations were acquired in June 2010, shortly after equinox, with negligible contribution from Saturn's ring emission. Methods: Tropospheric temperatures and the vertical distributions of phosphine and ammonia are derived using an optimal estimation retrieval algorithm to reproduce the sub-millimetre data. The abundance of methane, water and upper limits on a range of different species are estimated using a line-by-line forward model. Results: Saturn's disc-averaged temperature profile is found to be quasi-isothermal between 60 and 300 mbar, with uncertainties of 7 K due to the absolute calibration of SPIRE. Modelling of PH3 rotational lines confirms the vertical profile derived in previous studies and shows that negligible PH3 is present above the 10- to 20-mbar level. The upper tropospheric abundance of NH3 appears to follow a vapour pressure distribution throughout the region of sensitivity in the SPIRE data, but the degree of saturation is highly uncertain. The tropospheric CH4 abundance and Saturn's bulk C/H ratio are consistent with Cassini studies. We improve the upper limits on several species (H2S, HCN, HCP and HI); provide the first observational constraints on others (SO2, CS, methanol, formaldehyde, CH3Cl); and confirm previous upper limits on HF, HCl and HBr. Stratospheric emission from H2O is suggested at 36.6 and 38.8 cm-1 with a 1σ significance level, and these lines are used to derive mole fractions and column abundances consistent with ISO and SWAS estimations a decade earlier.
dc.language.isoen
dc.publisherEDP Sciences
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subject.enplanets and satellites: composition
dc.subject.enPlanets and satellites: atmospheres
dc.subject.ensubmillimeter: general
dc.subject.enplanets and satellites: individual: Saturn
dc.title.enSub-millimetre spectroscopy of Saturn's trace gases from Herschel/SPIRE
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201118415
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page44
bordeaux.volume539
bordeaux.peerReviewedoui
hal.identifierhal-00675091
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00675091v1
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