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16 April 2024 |
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Article overview
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First detection of methylisocyanate (CH3NCO) in a solar-type protostar | | R. Martín-Doménech
; V. Rivilla
; I. Jiménez-Serra
; D. Quenard
; L. Testi
; J. Martín-Pintado
; | | Date: |
16 Jan 2017 | | Abstract: | We report the first detection of the prebiotic complex organic molecule
CH$_3$NCO in a solar-type protostar, IRAS16293-2422 B. This species is one of
the most abundant complex organic molecule detected on the surface of the comet
67P/Churyumov-Gerasimenko, and in the insterstellar medium it has only been
found in hot cores around high-mass protostars. We have used multi-frequency
ALMA observations from 90 GHz to 350 GHz covering 11 unblended transitions of
CH$_3$NCO and 40 more transitions that appear blended with emission from other
molecular species. Our Local Thermodynamic Equilibrium analysis provides an
excitation temperature of 232$pm$41 K and a column density of
(7.9$pm$1.7)$ imes$10$^{15}$ cm$^{-2}$, which implies an abundance of
(7$pm$2)$ imes$10$^{-10}$ with respect to molecular hydrogen. The derived
column density ratios CH$_3$NCO/HNCO, CH$_3$NCO/NH$_2$CHO, and
CH$_3$NCO/CH$_3$CN are $sim$0.3, $sim$0.8, and $sim$0.2, respectively, which
are different from those measured in hot cores and in comet
67P/Churyumov-Gerasimenko. Our chemical modelling of CH$_3$NCO reproduces well
the abundances and column density ratios CH$_3$NCO/HNCO and CH$_3$NCO/NH$_2$CHO
measured in IRAS16293-2422 B, suggesting that the production of CH$_3$NCO could
occur mostly via gas-phase chemistry after the evaporation of HNCO from dust
grains. | | Source: | arXiv, 1701.4376 | | Services: | Forum | Review | PDF | Favorites | |
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