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Sulphur chemistry in the L1544 pre-stellar core

hal.structure.identifierInstitut de recherche en astrophysique et planétologie [IRAP]
dc.contributor.authorVASTEL, Charlotte
dc.contributor.authorQUÉNARD, David
dc.contributor.authorGAL, Romane Le
hal.structure.identifierAMOR 2018
dc.contributor.authorWAKELAM, Valentine
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorANDRIANASOLO, Aina
dc.contributor.authorCASELLI, Paolo
hal.structure.identifierAMOR 2018
dc.contributor.authorVIDAL, Thomas
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorCECCARELLI, Cecilia
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorLEFLOCH, Bertrand
dc.contributor.authorBACHILLER, Rafael
dc.date.issued2018
dc.identifier.issn0035-8711
dc.description.abstractEnThe L1544 pre-stellar core has been observed as part of the ASAI IRAM 30m Large Program as well as follow-up programs. These observations have revealed the chemical richness of the earliest phases of low-mass star-forming regions. In this paper we focus on the twenty-one sulphur bearing species (ions, isotopomers and deuteration) that have been detected in this spectral-survey through fifty one transitions: CS, CCS, C3S, SO, SO2, H2CS, OCS, HSCN, NS, HCS+, NS+ and H2S. We also report the tentative detection (4 {\sigma} level) for methyl mercaptan (CH3SH). LTE and non-LTE radiative transfer modelling have been performed and we used the nautilus chemical code updated with the most recent chemical network for sulphur to explain our observations. From the chemical modelling we expect a strong radial variation for the abundances of these species, which mostly are emitted in the external layer where non thermal desorption of other species has previously been observed. We show that the chemical study cannot be compared to what has been done for the TMC-1 dark cloud, where the abundance is supposed constant along the line of sight, and conclude that a strong sulphur depletion is necessary to fully reproduce our observations of the prototypical pre-stellar core L1544.
dc.language.isoen
dc.publisherOxford University Press (OUP): Policy P - Oxford Open Option A
dc.title.enSulphur chemistry in the L1544 pre-stellar core
dc.typeArticle de revue
dc.identifier.doi10.1093/mnras/sty1336
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1806.01102
bordeaux.journalMonthly Notices of the Royal Astronomical Society
bordeaux.page5514-5532
bordeaux.volume478
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-01807790
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01807790v1
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