2021/02/17 by J. Cernicharo, M. Agundez, M. Agúndez +9 · 73 citations
Chemistry · Physics and Astronomy · #Abundance (ecology) #Acetylene #Analytical Chemistry (journal) #Astrophysics and Star Formation Studies #Column (typography) #Cyanide #Molecular Spectroscopy and Structure #Molecule #Spectroscopy and Laser Applications #astro-ph.GA
paper · pdf · doi:10.1051/0004-6361/202140434
published in Astronomy and Astrophysics 647, L2 (EDP Sciences) · Accepted for publication in A&a Letters
openalex publication_date 2021/02/17 · arxiv created 2021/02/22 · openalex created_date 2021/03/01 · arxiv updated 2021/03/10 · openalex updated_date 2026/08/05
We present the discovery in TMC-1 of vinyl acetylene, CH 2 CHCCH, and the detection, for the first time in a cold dark cloud, of HCCN, HC 4 N, and CH 3 CH 2 CN. A tentative detection of CH 3 CH 2 CCH is also reported. The column density of vinyl acetylene is (1.2 ± 0.2) × 10 13 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, CH 3 CHCH 2 . The column densities derived for HCCN and HC 4 N are (4.4 ± 04) × 10 11 cm −2 and (3.7 ± 0.4) × 10 11 cm −2 , respectively. Hence, the HCCN/HC 4 N abundance ratio is 1.2 ± 0.3. For ethyl cyanide we derive a column density of (1.1 ± 0.3) × 10 11 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.