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http://hdl.handle.net/20.500.12386/27370
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Bianchi, E. | en_US |
dc.contributor.author | CODELLA, CLAUDIO | en_US |
dc.contributor.author | Ceccarelli, C. | en_US |
dc.contributor.author | FONTANI, FRANCESCO | en_US |
dc.contributor.author | Testi, L. | en_US |
dc.contributor.author | Bachiller, R. | en_US |
dc.contributor.author | Lefloch, B. | en_US |
dc.contributor.author | PODIO, LINDA | en_US |
dc.contributor.author | Taquet, V. | en_US |
dc.date.accessioned | 2020-09-14T15:03:37Z | - |
dc.date.available | 2020-09-14T15:03:37Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/27370 | - |
dc.description.abstract | We present the results of formaldehyde and methanol deuteration measurements towards the Class I low-mass protostar SVS13-A in the framework of the IRAM 30-m ASAI (Astrochemical Surveys at IRAM) project. We detected emission lines of formaldehyde, methanol and their deuterated forms (HDCO, D<SUB>2</SUB>CO, CHD<SUB>2</SUB>OH, CH<SUB>3</SUB>OD) with E<SUB>up</SUB> up to 276 K. The formaldehyde analysis indicates T<SUB>kin</SUB> ∼ 15-30 K, n_H_2 \ge 10<SUP>6</SUP> cm<SUP>-3</SUP> and a size of about 1200 au suggesting an origin in the protostellar envelope. For methanol, we find two components: (I) a high temperature (T<SUB>kin</SUB> ∼ 80 K) and very dense (>10<SUP>8</SUP> cm<SUP>-3</SUP>) gas from a hot corino (radius ≃ 35 au), and (II) a colder (T<SUB>kin</SUB> ≤ 70 K) and more extended (radius ≃ 350 au) region. The deuterium fractionation is 9 × 10<SUP>-2</SUP> for HDCO, 4 × 10<SUP>-3</SUP> for D<SUB>2</SUB>CO and 2-7 × 10<SUP>-3</SUP> for CH<SUB>2</SUB>DOH, up to two orders of magnitude lower than the values measured in Class 0 sources. We also derive formaldehyde deuteration in the outflow: 4 × 10<SUP>-3</SUP>, in agreement with what found in the L1157-B1 protostellar shock. Finally, we estimate [CH<SUB>2</SUB>DOH]/[CH<SUB>3</SUB>OD] ≃ 2. The decrease of deuteration in the Class I source SVS13-A with respect to Class 0 sources can be explained by gas-phase processes. Alternatively, a lower deuteration could be the effect of a gradual collapse of less deuterated external shells of the protostellar envelope. The present measurements fill in the gap between pre-stellar cores and protoplanetary discs in the context of organic deuteration measurements. | en_US |
dc.language.iso | eng | en_US |
dc.title | Decrease of the organic deuteration during the evolution of Sun-like protostars: the case of SVS13-A | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stx252 | en_US |
dc.identifier.scopus | 2-s2.0-85031319622 | en_US |
dc.identifier.isi | 000398419400040 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/467/3/3011/2978035 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 467 | en_US |
dc.relation.issue | 3 | en_US |
dc.relation.firstpage | 3011 | en_US |
dc.type.referee | REF_1 | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2017MNRAS.467.3011B | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0003-1514-3074 | - |
crisitem.author.orcid | 0000-0003-0348-3418 | - |
crisitem.author.orcid | 0000-0003-1859-3070 | - |
crisitem.author.orcid | 0000-0003-2733-5372 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
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