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Herschel/HIFI search for H2-17O and H2-18O in IRC+10216: constraints on models for the origin of water vapor

dc.contributor.authorNEUFELD, David A.
dc.contributor.authorTOLLS, Volker
hal.structure.identifierSSE 2013
dc.contributor.authorAGÚNDEZ, M.
dc.contributor.authorGONZÁLEZ-ALFONSO, Eduardo
dc.contributor.authorDECIN, Leen
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
dc.contributor.authorDANIEL, Fabien
hal.structure.identifierDepartamento de Astrofísica Molecular e Infrarroja [DAMIR]
dc.contributor.authorCERNICHARO, José
dc.contributor.authorMELNICK, Gary J.
dc.contributor.authorSCHMIDT, Miroslaw
dc.contributor.authorSZCZERBA, Ryszard
dc.date.created2013-02-25
dc.date.issued2013
dc.identifier.issn2041-8205
dc.description.abstractEnWe report the results of a sensitive search for the minor isotopologues of water, H2-17O and H2-18O, toward the carbon-rich AGB star IRC+10216 (a.k.a. CW Leonis) using the HIFI instrument on the Herschel Space Observatory. This search was motivated by the fact that any detection of isotopic enhancement in the H2-17O and H2-18O abundances would have strongly implicated CO photodissociation as the source of the atomic oxygen needed to produce water in a carbon-rich circumstellar envelope. Our observations place an upper limit of 1/470 on the H2-17O/H2-16O abundance ratio. Given the isotopic 17O/16O ratio of 1/840 inferred previously for the photosphere of IRC+10216, this result places an upper limit of a factor 1.8 on the extent of any isotope-selective enhancement of H2-17O in the circumstellar material, and provides an important constraint on any model that invokes CO photodissociation as the source of O for H2O production. In the context of the clumpy photodissociation model proposed previously for the origin of water in IRC+10216, our limit implies that 12C-16O (not 13C-16O or SiO) must be the dominant source of 16O for H2O production, and that the effects of self-shielding can only have reduced the 12C-16O photodissociation rate by at most a factor ~ 2.
dc.language.isoen
dc.publisherBristol : IOP Publishing
dc.title.enHerschel/HIFI search for H2-17O and H2-18O in IRC+10216: constraints on models for the origin of water vapor
dc.typeArticle de revue
dc.identifier.doi10.1088/2041-8205/767/1/L3
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.identifier.arxiv1302.6233
bordeaux.journalThe Astrophysical journal letters
bordeaux.pageid. L3
bordeaux.volume767
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-01016740
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01016740v1
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