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

hal.structure.identifierNational Chiao Tung University [NCTU]
dc.contributor.authorCABEZAS, C.
hal.structure.identifierNational Chiao Tung University [NCTU]
dc.contributor.authorFUENTETAJA, R.
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres [LERMA]
dc.contributor.authorROUEFF, E.
hal.structure.identifierSSE 2012
dc.contributor.authorAGÚNDEZ, M.
hal.structure.identifierObservatorio Astronomico Nacional, Madrid
dc.contributor.authorTERCERO, B.
hal.structure.identifierINAF - Osservatorio Astronomico di Bologna [OABO]
dc.contributor.authorMARCELINO, N.
hal.structure.identifierNational Chiao Tung University [NCTU]
dc.contributor.authorPARDO, J.
hal.structure.identifierObservatorio Astronomico Nacional, Madrid
dc.contributor.authorDE VICENTE, P.
hal.structure.identifierInstituto de Física Fundamental [Madrid] [IFF]
dc.contributor.authorCERNICHARO, J.
dc.date.issued2021-12-22
dc.identifier.issn0004-6361
dc.description.abstractEnWe 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.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrochemistry -ISM
dc.subject.enmolecules -ISM
dc.subject.enindividual (TMC-1) -line
dc.subject.enidentification -molecular data
dc.title.enNew deuterated species in TMC-1: Detection of CH 2 DC 4 H with the QUIJOTE line survey
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/202142814
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageL5
bordeaux.volume657
bordeaux.peerReviewedoui
hal.identifierhal-03556923
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03556923v1
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