Kulterer, BM, Drozdovskaya, MN, Antonellini, S et al. (2 more authors) (2022) Fevering Interstellar Ices Have More CH3OD. ACS Earth and Space Chemistry, 6 (5). pp. 1171-1188. ISSN 2472-3452
Abstract
Monodeuterated methanol is thought to form during the prestellar core stage of star formation. Observed variations in the CH2DOH/CH3OD ratio suggest that its formation is strongly dependent on the surrounding cloud conditions. Thus, it is a potential tracer of the physical conditions before the onset of star formation. A single-point physical model representative of a typical prestellar core is coupled to chemical models to investigate potential formation pathways toward deuterated methanol at the prestellar stage. Simple addition reactions of H and D are not able to reproduce observed abundances. The implementation of an experimentally verified abstraction scheme leads to the efficient formation of methyl-deuterated methanol, but lacks sufficient formation of hydroxy-deuterated methanol. CH3OD is most likely formed at a later evolutionary stage, potentially from H–D exchange reactions in warm ices between HDO (and D2O) and CH3OH. The CH2DOH/CH3OD ratio is not an appropriate tracer of the physical conditions during the prestellar stage, but might be better suited as a tracer of ice heating.
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Copyright, Publisher and Additional Information: | © 2022 American Chemical Society. This is an author produced version of an article published in ACS Earth and Space Chemistry. Uploaded in accordance with the publisher's self-archiving policy. | ||||||
Keywords: | astrochemistry prestellar cores methanol deuteration interstellar medium | ||||||
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Institution: | The University of Leeds | ||||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds) | ||||||
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Depositing User: | Symplectic Publications | ||||||
Date Deposited: | 26 May 2022 11:06 | ||||||
Last Modified: | 13 Apr 2023 00:13 | ||||||
Status: | Published | ||||||
Publisher: | American Chemical Society (ACS) | ||||||
Identification Number: | https://doi.org/10.1021/acsearthspacechem.1c00340 |