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Herschel map of Saturn's stratospheric water, delivered by the plumes of Enceladus

hal.structure.identifierASP 2019
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA (UMR_8109)]
dc.contributor.authorCAVALIÉ, T.
dc.contributor.authorHUE, V.
hal.structure.identifierMax-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
dc.contributor.authorHARTOGH, P.
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA (UMR_8109)]
dc.contributor.authorMORENO, R.
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA (UMR_8109)]
dc.contributor.authorLELLOUCH, E.
hal.structure.identifierforeign laboratories [FL]
dc.contributor.authorFEUCHTGRUBER, H.
hal.structure.identifierMax-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
dc.contributor.authorJARCHOW, C.
hal.structure.identifierLaboratory for Atmospheric and Space Physics [Boulder] [LASP]
dc.contributor.authorCASSIDY, T.
hal.structure.identifierDepartment of Atmospheric, Oceanic and Planetary Physics [Oxford] [AOPP]
dc.contributor.authorFLETCHER, L. N.
hal.structure.identifierASP 2019
dc.contributor.authorBILLEBAUD, F.
hal.structure.identifierASP 2019
dc.contributor.authorDOBRIJEVIC, M.
hal.structure.identifierMax-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
dc.contributor.authorREZAC, L.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorORTON, G. S.
hal.structure.identifierMax-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
dc.contributor.authorRENGEL, M.
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA (UMR_8109)]
dc.contributor.authorFOUCHET, T.
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorGUERLET, S.
dc.date.issued2019
dc.identifier.issn0004-6361
dc.description.abstractEnContext. The origin of water in the stratospheres of Giant Planets has been an outstanding question ever since its first detection by ISO some 20 years ago. Water can originate from interplanetary dust particles, icy rings and satellites and large comet impacts. Analysis of Herschel Space Observatory observations have proven that the bulk of Jupiter's stratospheric water was delivered by the Shoemaker-Levy 9 impacts in 1994. In 2006, the Cassini mission detected water plumes at the South Pole of Enceladus, placing the moon as a serious candidate for Saturn's stratospheric water. Further evidence was found in 2011, when Herschel demonstrated the presence of a water torus at the orbital distance of Enceladus, fed by the moon's plumes. Finally, water falling from the rings onto Saturn's uppermost atmospheric layers at low latitudes was detected during the final orbits of Cassini's end-of-mission plunge into the atmosphere. Aims. In this paper, we use Herschel mapping observations of water in Saturn's stratosphere to identify its source. Methods. Several empirical models are tested against the Herschel-HIFI and -PACS observations, which were collected on December 30, 2010, and January 2nd, 2011 (respectively). Results. We demonstrate that Saturn's stratospheric water is not uniformly mixed as a function of latitude, but peaking at the equator and decreasing poleward with a Gaussian distribution. We obtain our best fit with an equatorial mole fraction 1.1 ppb and a half-width at half-maximum of 25°, when accounting for a temperature increase in the two warm stratospheric vortices produced by Saturn's Great Storm of 2010-2011. Conclusions. This work demonstrates that Enceladus is the main source of Saturn's stratospheric water.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrophysics - Earth and Planetary Astrophysics
dc.title.enHerschel map of Saturn's stratospheric water, delivered by the plumes of Enceladus
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201935954
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.identifier.arxiv1908.07399
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A87
bordeaux.volume630
bordeaux.peerReviewedoui
hal.identifierhal-02282405
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02282405v1
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