A study of singly deuterated cyclopropenylidene c-C3HD in the protostar IRAS 16293–2422

Abstract 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 ob...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2017-06, Vol.467 (3), p.3525-3532
Main Authors: Majumdar, L., Gratier, P., Andron, I., Wakelam, V., Caux, E.
Format: Article
Language:English
Subjects:
Astrophysics
Cosmology and Extra-Galactic Astrophysics
Sciences of the Universe
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Summary:Abstract 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 c-C3H2. 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.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stx259