Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 467, Issue 3, Pages 3525-3532Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx259
Keywords
astrochemistry; methods: statistical; ISM: abundances; ISM: evolution; ISM:molecules.
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Funding
- INSU/CNRS (France)
- MPG (Germany)
- IGN (Spain)
- ERC (3DICE) [336474]
- INSU/CNRS
- Conseil National de la Recherche Scientifique (CNRS)
- Centre National d'Etudes Spatiales (CNES)
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Cyclic-C3HD (c-C3HD) is a singly deuterated isotopologue of c-C3H2, which is one of the most abundant and widespread molecules in our Galaxy. We observed IRAS 16293-2422 in the 3-mm band with a single frequency set-up using the EMIR heterodyne 3 mm receiver of the IRAM 30-m telescope. We observed seven lines of c-C3HD and three lines of cC(3)H(2). Observed abundances are compared with astrochemical simulations using the NAUTILUS gas-grain chemical model. Assuming that the size of the protostellar envelope is 3000 au and assuming the same excitation temperatures for both c-C3H2 and c-C3HD, we obtain a deuterium fraction of 14(-3)(+4)per cent.
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