First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)

7 pags., 2 figs., 7 tabs.

Detalhes bibliográficos
Autores: Agúndez, Marcelino, Roueff, E., Cabezas, Carlos, Cernicharo, José, Marcelino, Nuria
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2021
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/257843
Acesso em linha:http://hdl.handle.net/10261/257843
Access Level:acceso abierto
Palavra-chave:Astrochemistry
Line: identification
Molecular processes
ISM: molecules
Radio lines: ISM
id ES_bf09c5d3265c01c8f3ea746d7a72c077
oai_identifier_str oai:digital.csic.es:10261/257843
network_acronym_str ES
network_name_str España
repository_id_str
spelling First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)Agúndez, MarcelinoRoueff, E.Cabezas, CarlosCernicharo, JoséMarcelino, NuriaAstrochemistryLine: identificationMolecular processesISM: moleculesRadio lines: ISM7 pags., 2 figs., 7 tabs.We report the first detection in space of the two doubly deuterated isotopologues of methyl acetylene. The species CHD2CCH and CH2DCCD were identified in the dense core L483 through, respectively, nine and eight rotational lines in the 72-116 GHz range using the 30 m telescope of the Institut de Radioastronomie Millimétrique (IRAM). We combined the astronomical frequencies observed here with laboratory frequencies from the literature measured in the 29-47 GHz range to derive more accurate spectroscopic parameters for the two isotopologues. We derive beam-averaged column densities of (2.7 ± 0.5) × 1012 cm-2 for CHD2CCH and (2.2 ± 0.4) × 1012 cm-2 for CH2DCCD, which translate to abundance ratios of CH3CCH/CHD2CCH = 34 ± 10 and CH3CCH/CH2DCCD = 42 ± 13. The doubly deuterated isotopologues of methyl acetylene are only a few times less abundant than the singly deuterated ones, specifically around 2.4 times less abundant than CH3CCD. The abundances of the different deuterated isotopologues with respect to CH3CCH are reasonably accounted for by a gas-phase chemical model in which deuteration occurs from the precursor ions C3H6D+ and C3H5D+, when the ortho-to-para ratio of molecular hydrogen is sufficiently low. This points to gas-phase chemical reactions, rather than grain-surface processes, as being responsible for the formation and deuterium fractionation of CH3CCH in L483. The abundance ratios CH2DCCH/CH3CCD = 3.0 ± 0.9 and CHD2CCH/CH2DCCD = 1.25 ± 0.37 observed in L483 are consistent with the statistically expected values of three and one, respectively, with the slight overabundance of CHD2CCH compared to CH2DCCD being well explained by the chemical model.We acknowledge funding support from Spanish MICIU through grants AYA2016-75066-C2-1-P, PID2019-106110GB-I00, and PID2019-107115GB-C21 and from the European Research Council (ERC Grant 610256: NANOCOSMOS). M.A. also acknowledges funding support from the Ramón y Cajal programme of Spanish MICIU (grant RyC-2014-16277).Springer NatureMinisterio de Ciencia, Innovación y Universidades (España)European CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2022202220212022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/257843reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MICIU//AYA2016-75066-C2-1-Pinfo:eu-repo/grantAgreement/MICIU//PID2019-106110GB-I00info:eu-repo/grantAgreement/MICIU//PID2019-107115GB-C21info:eu-repo/grantAgreement/EC/FP7/610256http://dx.doi.org/10.1051/0004-6361/202140843Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2578432026-05-22T06:33:51Z
dc.title.none.fl_str_mv First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)
title First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)
spellingShingle First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)
Agúndez, Marcelino
Astrochemistry
Line: identification
Molecular processes
ISM: molecules
Radio lines: ISM
title_short First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)
title_full First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)
title_fullStr First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)
title_full_unstemmed First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)
title_sort First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)
dc.creator.none.fl_str_mv Agúndez, Marcelino
Roueff, E.
Cabezas, Carlos
Cernicharo, José
Marcelino, Nuria
author Agúndez, Marcelino
author_facet Agúndez, Marcelino
Roueff, E.
Cabezas, Carlos
Cernicharo, José
Marcelino, Nuria
author_role author
author2 Roueff, E.
Cabezas, Carlos
Cernicharo, José
Marcelino, Nuria
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia, Innovación y Universidades (España)
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Astrochemistry
Line: identification
Molecular processes
ISM: molecules
Radio lines: ISM
topic Astrochemistry
Line: identification
Molecular processes
ISM: molecules
Radio lines: ISM
description 7 pags., 2 figs., 7 tabs.
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/257843
url http://hdl.handle.net/10261/257843
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MICIU//AYA2016-75066-C2-1-P
info:eu-repo/grantAgreement/MICIU//PID2019-106110GB-I00
info:eu-repo/grantAgreement/MICIU//PID2019-107115GB-C21
info:eu-repo/grantAgreement/EC/FP7/610256
http://dx.doi.org/10.1051/0004-6361/202140843
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869418335918096384
score 15,811543

Registos relacionados