Evolutionary view through the starless cores in Taurus
| dc.contributor.author | NAVARRO-ALMAIDA, D. | |
| dc.contributor.author | FUENTE, A. | |
| dc.contributor.author | MAJUMDAR, L. | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| dc.contributor.author | WAKELAM, V. | |
| dc.contributor.author | CASELLI, P. | |
| dc.contributor.author | RIVIÈRE-MARICHALAR, P. | |
| dc.contributor.author | TREVIÑO-MORALES, S. | |
| dc.contributor.author | CAZAUX, S. | |
| dc.contributor.author | JIMÉNEZ-SERRA, I. | |
| dc.contributor.author | KRAMER, C. | |
| dc.contributor.author | CHACÓN-TANARRO, A. | |
| dc.contributor.author | KIRK, J. | |
| dc.contributor.author | WARD-THOMPSON, D. | |
| dc.contributor.author | TAFALLA, M. | |
| dc.date.issued | 2021-09 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | Context. The chemical and physical evolution of starless and pre-stellar cores are of paramount importance to understanding the process of star formation. The Taurus Molecular Cloud cores TMC 1-C and TMC 1-CP share similar initial conditions and provide an excellent opportunity to understand the evolution of the pre-stellar core phase. Aims. We investigated the evolutionary stage of starless cores based on observations towards the prototypical dark cores TMC 1-C and TMC 1-CP. Methods. We mapped the prototypical dark cores TMC 1-C and TMC 1-CP in the CS 3 → 2, C 34 S 3 → 2, 13 CS 2 → 1, DCN 1 → 0, DCN 2 → 1, DNC 1 → 0, DNC 2 → 1, DN 13 C 1 → 0, DN 13 C 2 → 1, N 2 H + 1 → 0, and N 2 D + 1 → 0 transitions. We performed a multi-transitional study of CS and its isotopologs, DCN, and DNC lines to characterize the physical and chemical properties of these cores. We studied their chemistry using the state-of-the-art gas-grain chemical code N AUTILUS and pseudo time-dependent models to determine their evolutionary stage. Results. The central n H volume density, the N 2 H + column density, and the abundances of deuterated species are higher in TMC 1-C than in TMC 1-CP, yielding a higher N 2 H + deuterium fraction in TMC 1-C, thus indicating a later evolutionary stage for TMC 1-C. The chemical modeling with pseudo time-dependent models and their radiative transfer are in agreement with this statement, allowing us to estimate a collapse timescale of ~1 Myr for TMC 1-C. Models with a younger collapse scenario or a collapse slowed down by a magnetic support are found to more closely reproduce the observations towards TMC 1-CP. Conclusions. Observational diagnostics seem to indicate that TMC 1-C is in a later evolutionary stage than TMC 1-CP, with a chemical age ~1 Myr. TMC 1-C shows signs of being an evolved core at the onset of star formation, while TMC 1-CP appears to be in an earlier evolutionary stage due to a more recent formation or, alternatively, a collapse slowed down by a magnetic support. | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.title.en | Evolutionary view through the starless cores in Taurus | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/202140820 | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 2107.00423 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | A15 | |
| bordeaux.volume | 653 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-03795691 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-03795691v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2021-09&rft.volume=653&rft.spage=A15&rft.epage=A15&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=NAVARRO-ALMAIDA,%20D.&FUENTE,%20A.&MAJUMDAR,%20L.&WAKELAM,%20V.&CASELLI,%20P.&rft.genre=article |
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