Titre :

Discovery of CH3CHCO in TMC-1 with the QUIJOTE line survey

Auteur(s) :

Fuentetaja, R. [Auteur correspondant]
Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] [CSIC]
Bermúdez, C [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Cabezas, C. [Auteur]
Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] [CSIC]
Agúndez, M. [Auteur]
Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] [CSIC]
Tercero, B., [Auteur]
Instituto Geografico Nacional [IGN]
Marcelino, N. [Auteur]
Instituto Geografico Nacional [IGN]
Pardo, J. [Auteur]
Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] [CSIC]
Margules, Laurent [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Motiienko, Roman [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Guillemin, J. C. [Auteur]
Institut des Sciences Chimiques de Rennes [ISCR]
de Vicente, P [Auteur]
Cernicharo, J., [Auteur correspondant]
Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] [CSIC]

Titre de la revue :

Astronomy & Astrophysics - A&A

Pagination :

L6

Éditeur :

EDP Sciences

Date de publication :

2023

ISSN :

0004-6361

Mot(s)-clé(s) en anglais :

molecular data
line
identification
ISM
molecules
individual objects
TMC-1
astrochemistry

Discipline(s) HAL :

Chimie

Résumé en anglais : [en]

We report the detection of methyl ketene towards TMC-1 with the QUIJOTE line survey. Nineteen rotational transitions with rotational quantum numbers ranging from J = 3 up to J = 5 and K-a <= 2 were identified in the ...
Lire la suite >We report the detection of methyl ketene towards TMC-1 with the QUIJOTE line survey. Nineteen rotational transitions with rotational quantum numbers ranging from J = 3 up to J = 5 and K-a <= 2 were identified in the frequency range 32.0-50.4 GHz, 11 of which arise above the 3 sigma level. We derived a column density for CH3CHCO of N=1.5 x 10(11) cm(-2) and a rotational temperature of 9 K. Hence, the abundance ratio between ketene and methyl ketene, CH2CO/CH3CHCO, is 93. This species is the second C3H4O isomer detected. The other, trans-propenal (CH2CHCHO), corresponds to the most stable isomer and has a column density of N=(2.2 +/- 0.3)x10(11) cm(-2), which results in an abundance ratio CH2CHCHO/CH3CHCO of 1.5. The next non-detected isomer with the lowest energy is cis-propenal, which is therefore a good candidate for future discovery. We have carried out an in-depth study of the possible gas-phase chemical reactions involving methyl ketene to explain the abundance detected, achieving good agreement between chemical models and observations.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL