Astrophysical detections and databases for ...
Type de document :
Compte-rendu et recension critique d'ouvrage
Titre :
Astrophysical detections and databases for the mono deuterated species of acetaldehyde CH2DCOH and CH3COD
Auteur(s) :
H. Coudert, Laurent [Auteur]
Institut des Sciences Moléculaires d'Orsay [ISMO]
Margules, L. [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Physique Moléculaire aux Interfaces [PMI]
Université de Lille
Vastel, C. [Auteur]
Institut de recherche en astrophysique et planétologie [IRAP]
Motiienko, Roman [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Physique Moléculaire aux Interfaces [PMI]
Université de Lille
Caux, E. [Auteur]
Institut de recherche en astrophysique et planétologie [IRAP]
Guillemin, J. -C. [Auteur]
Institut des Sciences Chimiques de Rennes [ISCR]
Institut des Sciences Moléculaires d'Orsay [ISMO]
Margules, L. [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Physique Moléculaire aux Interfaces [PMI]
Université de Lille
Vastel, C. [Auteur]
Institut de recherche en astrophysique et planétologie [IRAP]
Motiienko, Roman [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Physique Moléculaire aux Interfaces [PMI]
Université de Lille
Caux, E. [Auteur]
Institut de recherche en astrophysique et planétologie [IRAP]
Guillemin, J. -C. [Auteur]
Institut des Sciences Chimiques de Rennes [ISCR]
Titre de la revue :
Astronomy and Astrophysics - A&A
Pagination :
A70
Éditeur :
EDP Sciences
Date de publication :
2019-04
ISSN :
0004-6361
Mot(s)-clé(s) en anglais :
ISM abundances
astrochemistry
line identification
ISM molecules
astrochemistry
line identification
ISM molecules
Discipline(s) HAL :
Planète et Univers [physics]/Astrophysique [astro-ph]
Chimie/Autre
Chimie/Autre
Résumé en anglais : [en]
Context. Detection of deuterated species may provide information on the evolving chemistry in the earliest phases of star-forming regions. For molecules with two isomeric forms of the same isotopic variant, gas-phase and ...
Lire la suite >Context. Detection of deuterated species may provide information on the evolving chemistry in the earliest phases of star-forming regions. For molecules with two isomeric forms of the same isotopic variant, gas-phase and solid-state formation pathways can be differentiated using their abundance ratio. Aims. Spectroscopic databases for astrophysical purposes are built for the two mono deuterated isomeric species CH 2 DCOH and CH 3 COD of the complex organic molecule acetaldehyde. These databases can be used to search and detect these two species in astrophysical surveys, retrieving their column density and therefore abundances.Methods. Submillimeter wave and terahertz transitions were measured for mono deuterated acetaldehyde CH 2 DCOH which is a non-rigid species displaying internal rotation of its asymmetrical CH 2 D methyl group. An analysis of a dataset consisting of previously measured microwave data and the newly measured transition was carried out with a model accounting for the large amplitude torsion.Results. The frequencies of 2556 transitions are reproduced with a unitless standard deviation of 2.3 yielding various spectroscopic constants. Spectroscopic databases for astrophysical purposes were built for CH 2 DCOH using the results of the present analysis and for CH 3 COD using the results of a previous spectroscopic investigation. These two species were both searched for and are detected toward a low-mass star-forming region.Conclusions. We report the first detection of CH 2 DCOH (93 transitions) and the detection of CH 3 COD (43 transitions) species in source B of the IRAS 16293−2422 young stellar binary system located in the ρ Ophiuchus cloud region, using the publicly available ALMA Protostellar Interferometric Line Survey.Lire moins >
Lire la suite >Context. Detection of deuterated species may provide information on the evolving chemistry in the earliest phases of star-forming regions. For molecules with two isomeric forms of the same isotopic variant, gas-phase and solid-state formation pathways can be differentiated using their abundance ratio. Aims. Spectroscopic databases for astrophysical purposes are built for the two mono deuterated isomeric species CH 2 DCOH and CH 3 COD of the complex organic molecule acetaldehyde. These databases can be used to search and detect these two species in astrophysical surveys, retrieving their column density and therefore abundances.Methods. Submillimeter wave and terahertz transitions were measured for mono deuterated acetaldehyde CH 2 DCOH which is a non-rigid species displaying internal rotation of its asymmetrical CH 2 D methyl group. An analysis of a dataset consisting of previously measured microwave data and the newly measured transition was carried out with a model accounting for the large amplitude torsion.Results. The frequencies of 2556 transitions are reproduced with a unitless standard deviation of 2.3 yielding various spectroscopic constants. Spectroscopic databases for astrophysical purposes were built for CH 2 DCOH using the results of the present analysis and for CH 3 COD using the results of a previous spectroscopic investigation. These two species were both searched for and are detected toward a low-mass star-forming region.Conclusions. We report the first detection of CH 2 DCOH (93 transitions) and the detection of CH 3 COD (43 transitions) species in source B of the IRAS 16293−2422 young stellar binary system located in the ρ Ophiuchus cloud region, using the publicly available ALMA Protostellar Interferometric Line Survey.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Source :
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