| Issue |
A&A
Volume 669, January 2023
|
|
|---|---|---|
| Article Number | L6 | |
| Number of page(s) | 9 | |
| Section | Letters to the Editor | |
| DOI | https://doi.org/10.1051/0004-6361/202245524 | |
| Published online | 06 January 2023 | |
Letter to the Editor
First detection of CHD2OH towards pre-stellar cores
Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstr. 1, 85748 Garching bei München, Germany
e-mail: ylin@mpe.mpg.de
Received:
21
November
2022
Accepted:
19
December
2022
The inheritance of material across the star and planet formation process is traced by deuterium fractionation. We report here the first detection of doubly deuterated methanol towards pre-stellar cores. We study the deuterium fractionation of methanol, CH3OH, towards two starless and two pre-stellar cores. We derive a D/H ratio of 0.8–1.9% with CH2DOH in pre-stellar cores H-MM1 and L694-2, consistent with measurements in more evolved Class 0/I objects and comet 67P/Churyumov-Gerasimenko, suggesting a direct chemical link arising in the pre-stellar stage. Furthermore, the column density ratios of CHD2OH/CH2DOH are ∼50–80%, as consistently high as towards Class 0/I objects, indicating an efficient formation mechanism of CHD2OH, possibly through H atom additions to D2CO. The CH2DOH/CH3OH and CHD2OH/CH3OH column density ratios in the two pre-stellar cores are larger than that in the two starless cores B68 and L1521E, representing an evolutionary trend of methanol deuteration in early-stage cores.
Key words: stars: formation / ISM: abundances / ISM: clouds / ISM: molecules / astrochemistry
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe-to-Open model.
Open Access funding provided by Max Planck Society.
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