CABEZAS, C.; FUENTETAJA, R.; ROUEFF, E.; AGÚNDEZ, M.; TERCERO, B.; MARCELINO, N.; PARDO, J.; DE VICENTE, P.; CERNICHARO, J.

doi:10.1051/0004-6361/202142814

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CABEZAS, C.
National Chiao Tung University [NCTU]

FUENTETAJA, R.
National Chiao Tung University [NCTU]

ROUEFF, E.
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres [LERMA]

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Astronomy and Astrophysics - A&A. 2021-12-22, vol. 657, p. L5

EDP Sciences

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We report the first detection in space of the single deuterated isotopologue of methyldiacetylene, CH 2 DC 4 H. A total of 12 rotational transitions, with J = 8-12 and K a = 0 and 1, were identified for this species in TMC-1 in the 31.0-50.4 GHz range using the Yebes 40m radio telescope. The observed frequencies allowed us to obtain, for the first time, the spectroscopic parameters of this deuterated isotopologue. We derived a column density of (5.5±0.2)×10 11 cm −2. The abundance ratio between CH 3 C 4 H and CH 2 DC 4 H is 24±2. This ratio is similar to that found for the CH 3 C 3 N/CH 2 DC 3 N analogue system, which is 22±2. We did not detect the deuterated species CH 3 C 4 D, which has already been observed in laboratory experiments. The detection of deuterated CH 3 C 4 H allows us to extend the discussion on the chemical mechanisms of deuterium fractionation at work in TMC-1 using a new gas-phase chemical model with multiply deuterated molecules. Introducing a possible deuterium exchange reaction between CH 3 CCH and atomic deuterium allows us to account for the CH 3 C 4 H/CH 2 DC 4 H abundance ratio.< Réduire

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Astrochemistry -ISM

molecules -ISM

individual (TMC-1) -line

identification -molecular data

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New deuterated species in TMC-1: Detection of CH 2 DC 4 H with the QUIJOTE line survey

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