2023A&A...671L...6F


Query : 2023A&A...671L...6F

2023A&A...671L...6F - Astronomy and Astrophysics, volume 671, L6 (2023/3-1)

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

FUENTETAJA R., BERMUDEZ C., CABEZAS C., AGUNDEZ M., TERCERO B., MARCELINO N., PARDO J.R., MARGULES L., MOTIYENKO R.A., GUILLEMIN J.-C., DE VICENTE P. and CERNICHARO J.

Abstract (from CDS):

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 Ka ≤ 2 were identified in the frequency range 32.0-50.4 GHz, 11 of which arise above the 3σ level. We derived a column density for CH3CHCO of N = 1.5 × 1011 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)×1011 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.

Abstract Copyright: © The Authors 2023

Journal keyword(s): molecular data - line: identification - ISM: molecules - ISM: individual objects: TMC-1 - astrochemistry

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1681 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2299 1
3 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2271 1

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