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Discovery of CH2CHCCH and detection of HCCN, HC4N, CH3CH2CN, and, tentatively, CH3CH2CCH in TMC-1.

ABSTRACT: We present the discovery in TMC-1 of vinyl acetylene, CH2CHCCH, and the detection, for the first time in a cold dark cloud, of HCCN, HC4N, and CH3CH2CN. A tentative detection of CH3CH2CCH is also reported. The column density of vinyl acetylene is (1.2±0.2)×1013 cm-2, which makes it one of the most abundant closed-shell hydrocarbons detected in TMC-1. Its abundance is only three times lower than that of propylene, CH3CHCH2. The column densities derived for HCCN and HC4N are (4.4±0.4)×1011 cm-2 and (3.7±0.4)×1011 cm-2, respectively. Hence, the HCCN/HC4N abundance ratio is 1.2±0.3. For ethyl cyanide we derive a column density of (1.1 ±0.3)×1011 cm-2. These results are compared with a state-of-the-art chemical model of TMC-1, which is able to account for the observed abundances of these molecules through gas-phase chemical routes.

SUBMITTER: Cernicharo J 

PROVIDER: S-EPMC7610549 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature

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Discovery of CH<sub>2</sub>CHCCH and detection of HCCN, HC<sub>4</sub>N, CH<sub>3</sub>CH<sub>2</sub>CN, and, tentatively, CH<sub>3</sub>CH<sub>2</sub>CCH in TMC-1.

Cernicharo J J   Agúndez M M   Cabezas C C   Marcelino N N   Tercero B B   Pardo J R JR   Gallego J D JD   Tercero F F   López-Pérez J A JA   de Vicente P P  

Astronomy and astrophysics 20210310

We present the discovery in TMC-1 of vinyl acetylene, CH<sub>2</sub>CHCCH, and the detection, for the first time in a cold dark cloud, of HCCN, HC<sub>4</sub>N, and CH<sub>3</sub>CH<sub>2</sub>CN. A tentative detection of CH<sub>3</sub>CH<sub>2</sub>CCH is also reported. The column density of vinyl acetylene is (1.2±0.2)×10<sup>13</sup> cm<sup>-2</sup>, which makes it one of the most abundant closed-shell hydrocarbons detected in TMC-1. Its abundance is only three times lower than that of propyl  ...[more]

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