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hal.structure.identifierAMOR 2019
dc.contributor.authorVIDAL, Thomas
hal.structure.identifierÉcole normale supérieure de Lyon [ENS de Lyon]
dc.contributor.authorVAYTET, Neil
hal.structure.identifierAMOR 2019
dc.contributor.authorCOUTENS, Audrey
hal.structure.identifierAMOR 2019
dc.contributor.authorWAKELAM, Valentine
hal.structure.identifierAMOR 2019
dc.contributor.authorGRATIER, P.
dc.date.issued2019
dc.identifier.issn0035-8711
dc.description.abstractEnThe complexity of physico-chemical models of star formation is increasing, with models that take into account new processes and more realistic setups. These models allow astrochemists to compute the evolution of chemical species throughout star formation. Hence, comparing the outputs of such models to observations allows to bring new constraints on star formation. The work presented in this paper is based on the recent public release of a database of radiation hydrodynamical low-mass star formation models. We used this database as physical parameters to compute the time dependent chemical composition of collapsing cores with a 3-phase gas-grain model. The results are analyzed to find chemical tracers of the initial physical parameters of collapse such as the mass, radius, temperature, density, and free-fall time. They are also compared to observed molecular abundances of Class 0 protostars. We find numerous tracers of the initial parameters of collapse, except for the initial mass. More particularly, we find that gas phase CH3CN, NS and OCS trace the initial temperature, while H2CS trace the initial density and free-fall time of the parent cloud. The comparison of our results with a sample of 12 Class 0 low mass protostars allows us to constrain the initial parameters of collapse of low-mass prestellar cores. We find that low-mass protostars are preferentially formed within large cores with radii greater than 20000 au, masses between 2 and 4 Msol, temperatures lower or equal to 15 K, and densities between 6e4 and 2.5e5 part.cm-3, corresponding to free-fall times between 100 and 200 kyrs.
dc.language.isoen
dc.publisherOxford University Press (OUP): Policy P - Oxford Open Option A
dc.title.enNew constraints on the initial parameters of low-mass star formation from chemical modeling
dc.typeArticle de revue
dc.identifier.doi10.1093/mnras/stz1214
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA]
dc.identifier.arxiv1905.05592
bordeaux.journalMonthly Notices of the Royal Astronomical Society
bordeaux.page5197-5215
bordeaux.volume486
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-02130758
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02130758v1
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