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Title: Detection of complex organic molecules in young starless core L1521E
Authors: Scibelli, S.
Shirley, Y.
Vasyunin, A.
Launhardt, R.
Issue Date: 2021
Publisher: Oxford University Press
Citation: Detection of complex organic molecules in young starless core L1521E / S. Scibelli, Y. Shirley, A. Vasyunin, et al. — DOI 10.1093/mnras/stab1151 // Monthly Notices of the Royal Astronomical Society. — 2021. — Vol. 504. — Iss. 4. — P. 5754-5767.
Abstract: Determining the level of chemical complexity within dense starless and gravitationally bound pre-stellar cores is crucial for constructing chemical models, which subsequently constrain the initial chemical conditions of star formation. We have searched for complex organic molecules (COMs) in the young starless core L1521E, and report the first clear detection of dimethyl ether (CH3OCH3), methyl formate (HCOOCH3), and vinyl cyanide (CH2CHCN). Eight transitions of acetaldehyde (CH3CHO) were also detected, five of which (A states) were used to determine an excitation temperature to then calculate column densities for the other oxygen-bearing COMs. If source size was not taken into account (i.e. if filling fraction was assumed to be one), column density was underestimated, and thus we stress the need for higher resolution mapping data. We calculated L1521E COM abundances and compared them to other stages of low-mass star formation, also finding similarities to other starless/pre-stellar cores, suggesting related chemical evolution. The scenario that assumes formation of COMs in gas-phase reactions between precursors formed on grains and then ejected to the cold gas via reactive desorption was tested and was unable to reproduce observed COM abundances, with the exception of CH3CHO. These results suggest that COMs observed in cold gas are formed not by gas-phase reactions alone, but also through surface reactions on interstellar grains. Our observations present a new, unique challenge for existing theoretical astrochemical models. © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85108652032
PURE ID: 22362170
ISSN: 358711
DOI: 10.1093/mnras/stab1151
metadata.dc.description.sponsorship: The 12-m telescope is operated by the Arizona RadioObservatory (ARO), StewardObservatory,University of Arizona, with funding from the State of Arizona, NSF MRI Grant AST-1531366 (PI Ziurys), NSF MSIP grant SV5-85009/AST- 1440254 (PI Marrone), NSF CAREER grant AST-1653228 (PI Marrone), and a PIRE grant OISE-1743747 (PI Psaltis). Yancy Shirley and Samantha Scibelli were partially supported by NSF Grant AST-1410190 (PI Shirley). Samantha Scibelli is supported by National Science Foundation Graduate Research Fellowship (NSF GRF) Grant DGE-1143953. Anton Vasyunin is supported by the Russian Ministry of Science and Higher Education via the State Assignment Project FEUZ-2020-0038.
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