Afficher la notice abrégée

The ALMA-PILS survey: Isotopic composition of oxygen-containing complex organic molecules toward IRAS 16293-2422B

hal.structure.identifierforeign laboratories [FL]
dc.contributor.authorJØRGENSEN, J. K.
dc.contributor.authorMÜLLER, H. S. P.
dc.contributor.authorCALCUTT, H.
hal.structure.identifierAMOR 2018
dc.contributor.authorCOUTENS, Audrey
dc.contributor.authorDROZDOVSKAYA, M. N.
dc.contributor.authorÖBERG, K. I.
dc.contributor.authorPERSSON, M. V.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorTAQUET, V.
hal.structure.identifierLeiden Observatory [Leiden]
dc.contributor.authorVAN DISHOECK, E. F.
hal.structure.identifierCenter for Space and Habitability [CSH]
dc.contributor.authorWAMPFLER, S. F.
dc.date.created2018
dc.date.issued2018
dc.identifier.issn0004-6361
dc.description.abstractEnThis paper presents a systematic survey of the deuterated and 13C isotopologues of a variety of oxygen-bearing complex organic molecules on Solar System scales toward the protostar IRAS 16293-2422B. We use the data from an unbiased molecular line survey between 329 and 363 GHz from the Atacama Large Millimeter/submillimeter Array (ALMA). The observations probe scales of 60 AU where most of the organic molecules have sublimated off dust grains and are present in the gas-phase. The complex organic molecules can be divided into two groups with one group, the simpler species, showing a D/H ratio of approximately 2% and the other, the more complex species, D/H ratios of 4-8%. This division may reflect the formation time of each species in the ices before or during warm-up/infall of material through the protostellar envelope. No significant differences are seen in the deuteration of different functional groups for individual species, possibly a result of the short time-scale for infall through the innermost warm regions where exchange reactions between different species may be taking place. The species show differences in excitation temperatures between 125 K and 300 K. This likely reflects the binding energies/sublimation temperatures of the individual species, in good agreement to what has previously been found for high-mass sources. For dimethyl ether, the 12C/13C ratio is found to be lower by up to a factor of 2 compared to typical ISM values similar to what has previously been inferred for glycolaldehyde. The results point to the importance of ice surface chemistry for the formation of these complex organic molecules at different stages in the evolution of embedded protostars and demonstrate the use of accurate isotope measurements for understanding the history of individual species.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrophysics - Solar and Stellar Astrophysics
dc.subject.enAstrophysics - Astrophysics of Galaxies
dc.title.enThe ALMA-PILS survey: Isotopic composition of oxygen-containing complex organic molecules toward IRAS 16293-2422B
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201731667
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1808.08753
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageAccepted for publication in A&A
bordeaux.peerReviewedoui
hal.identifierhal-01868424
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01868424v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2018&rft.spage=Accepted%20for%20publication%20in%20A&A&rft.epage=Accepted%20for%20publication%20in%20A&A&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=J%C3%98RGENSEN,%20J.%20K.&M%C3%9CLLER,%20H.%20S.%20P.&CALCUTT,%20H.&COUTENS,%20Audrey&DROZDOVSKAYA,%20M.%20N.&rft.genre=article


Fichier(s) constituant ce document

FichiersTailleFormatVue

Il n'y a pas de fichiers associés à ce document.

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée