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Oxygen fractionation in dense molecular clouds

hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorLOISON, Jean-Christophe
hal.structure.identifierAMOR 2019
dc.contributor.authorWAKELAM, Valentine
hal.structure.identifierAMOR 2019
dc.contributor.authorGRATIER, P.
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorHICKSON, Kevin
dc.contributor.authorBACMANN, Aurore
dc.contributor.authorAGÚNDEZ, Marcelino
dc.contributor.authorMARCELINO, Nuria
hal.structure.identifierInstituto de Ciencia de Materiales de Madrid [ICMM]
dc.contributor.authorCERNICHARO, José
hal.structure.identifierJoint ALMA Observatory [JAO]
dc.contributor.authorGUZMAN, Viviana
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA (UMR_8112)]
dc.contributor.authorGERIN, Maryvonne
dc.contributor.authorGOICOECHEA, Javier
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA (UMR_8112)]
dc.contributor.authorROUEFF, Evelyne
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA (UMR_8112)]
dc.contributor.authorPETIT, Franck Le
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA (UMR_8112)]
dc.contributor.authorPETY, Jerome
hal.structure.identifierObservatorio Astronomico Nacional, Madrid
dc.contributor.authorFUENTE, Asuncion
hal.structure.identifierEuropean Space Astronomy Centre [ESAC]
dc.contributor.authorRIVIERE-MARICHALAR, Pablo
dc.date.issued2019-03-06
dc.identifier.issn0035-8711
dc.description.abstractEnWe have developed the first gas-grain chemical model for oxygen fractionation (also including sulphur fractionation) in dense molecular clouds, demonstrating that gas-phase chemistry generates variable oxygen fractionation levels, with a particularly strong effect for NO, SO, O2, and SO2. This large effect is due to the efficiency of the neutral 18 O + NO, 18 O + SO, and 18 O + O2 exchange reactions. The modeling results were compared to new and existing observed isotopic ratios in a selection of cold cores. The good agreement between model and observations requires that the gas-phase abundance of neutral oxygen atoms is large in the observed regions. The S 16 O/S 18 O ratio is predicted to vary substantially over time showing that it can be used as a sensitive chemical proxy for matter evolution in dense molecular clouds.
dc.language.isoen
dc.publisherOxford University Press (OUP): Policy P - Oxford Open Option A
dc.subject.enISM: abundances
dc.subject.enISM: clouds
dc.subject.enPhysical Data and Processes: astrochemistry
dc.title.enOxygen fractionation in dense molecular clouds
dc.typeArticle de revue
dc.identifier.doi10.1093/mnras/stz560
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPhysique [physics]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv1902.08840
bordeaux.journalMonthly Notices of the Royal Astronomical Society
bordeaux.page5777-5789
bordeaux.volume485
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-02065854
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02065854v1
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