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Evolutionary view t...
Evolutionary view through the starless cores in Taurus: Deuteration in TMC 1-C and TMC 1-CP
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- Navarro-Almaida, D. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Fuente, A. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Majumdar, L. (författare)
- National Institute of Science Education and Research
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- Wakelam, V. (författare)
- Université de Bordeaux,University of Bordeaux
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- Caselli, P. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Riviere-Marichalar, P. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Treviño Morales, Sandra, 1985 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Cazaux, S. (författare)
- Technische Universiteit Delft,Delft University of Technology (TU Delft),Universiteit Leiden (UL),Leiden University (UL)
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- Jimenez-Serra, I. (författare)
- Centro de Astrobiologia (CAB)
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- Kramer, C. (författare)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Chacón-Tanarro, A. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Kirk, J. (författare)
- University of Central Lancashire
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- Ward-Thompson, D. (författare)
- University of Central Lancashire
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- Tafalla, M. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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(creator_code:org_t)
- 2021-08-31
- 2021
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 653
- Relaterad länk:
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https://research.cha... (primary) (free)
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http://arxiv.org/pdf...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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, C34S 3 → 2, 13CS 2 → 1, DCN 1 → 0, DCN 2 → 1, DNC 1 → 0, DNC 2 → 1, DN13C 1 → 0, DN13C 2 → 1, N2H+ 1 → 0, and N2D+ 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 NAUTILUS and pseudo time-dependent models to determine their evolutionary stage. Results. The central nH volume density, the N2H+ column density, and the abundances of deuterated species are higher in TMC 1-C than in TMC 1-CP, yielding a higher N2H+ 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- Stars: formation
- ISM: abundances
- ISM: kinematics and dynamics
- Stars: low-mass
- ISM: molecules
- Astrochemistry
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Navarro-Almaida, ...
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Fuente, A.
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Majumdar, L.
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Wakelam, V.
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Caselli, P.
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Riviere-Marichal ...
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visa fler...
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Treviño Morales, ...
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Cazaux, S.
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Jimenez-Serra, I ...
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Kramer, C.
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Chacón-Tanarro, ...
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Kirk, J.
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Ward-Thompson, D ...
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Tafalla, M.
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