Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/27814
DC Field | Value | Language |
---|---|---|
dc.contributor.author | De Simone, M. | en_US |
dc.contributor.author | FONTANI, FRANCESCO | en_US |
dc.contributor.author | CODELLA, CLAUDIO | en_US |
dc.contributor.author | Ceccarelli, C. | en_US |
dc.contributor.author | Lefloch, B. | en_US |
dc.contributor.author | Bachiller, R. | en_US |
dc.contributor.author | López-Sepulcre, A. | en_US |
dc.contributor.author | Caux, E. | en_US |
dc.contributor.author | Vastel, C. | en_US |
dc.contributor.author | Soldateschi, J. | en_US |
dc.date.accessioned | 2020-10-14T14:28:55Z | - |
dc.date.available | 2020-10-14T14:28:55Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/27814 | - |
dc.description.abstract | Although chemical models predict that the deuterium fractionation in N<SUB>2</SUB>H<SUP>+</SUP> is a good evolutionary tracer in the star formation process, the fractionation of nitrogen is still a poorly understood process. Recent models have questioned the similar evolutionary trend expected for the two fractionation mechanisms in N<SUB>2</SUB>H<SUP>+</SUP>, based on a classical scenario in which ion-neutral reactions occurring in cold gas should have caused an enhancement of the abundance of N<SUB>2</SUB>D<SUP>+, 15</SUP>NNH<SUP>+</SUP>, and N<SUP>15</SUP>NH<SUP>+</SUP>. In the framework of the ASAI IRAM-30m large program, we have investigated the fractionation of deuterium and <SUP>15</SUP>N in N<SUB>2</SUB>H<SUP>+</SUP> in the best known representatives of the different evolutionary stages of the Sun-like star formation process. The goal is to ultimately confirm (or deny) the classical `ion-neutral reactions' scenario that predicts a similar trend for D and <SUP>15</SUP>N fractionation. We do not find any evolutionary trend of the <SUP>14</SUP>N/<SUP>15</SUP>N ratio from both the <SUP>15</SUP>NNH<SUP>+</SUP> and N<SUP>15</SUP>NH<SUP>+</SUP> isotopologues. Therefore, our findings confirm that, during the formation of a Sun-like star, the core evolution is irrelevant in the fractionation of <SUP>15</SUP>N. The independence of the <SUP>14</SUP>N/<SUP>15</SUP>N ratio with time, found also in high-mass star-forming cores, indicates that the enrichment in <SUP>15</SUP>N revealed in comets and protoplanetary discs is unlikely to happen at core scales. Nevertheless, we have firmly confirmed the evolutionary trend expected for the H/D ratio, with the N<SUB>2</SUB>H<SUP>+</SUP>/N<SUB>2</SUB>D<SUP>+</SUP> ratio decreasing before the pre-stellar core phase, and increasing monotonically during the protostellar phase. We have also confirmed clearly that the two fractionation mechanisms are not related. | en_US |
dc.language.iso | eng | en_US |
dc.title | Deuterium and 15N fractionation in N2H+ during the formation of a Sun-like star | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/sty353 | en_US |
dc.identifier.scopus | 2-s2.0-85046479962 | en_US |
dc.identifier.isi | 000430940900039 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/476/2/1982/4848314 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 476 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 1982 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 10 | en_US |
dc.description.international | sì | 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 | 2018MNRAS.476.1982D | 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.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0003-0348-3418 | - |
crisitem.author.orcid | 0000-0003-1514-3074 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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sty353.pdf | Pdf editoriale | 335.64 kB | Adobe PDF | View/Open |
1801.07539.pdf | postprint | 266.56 kB | Adobe PDF | View/Open |
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