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The sulphur saga in TMC-1: Discovery of HCSCN and HCSCCH

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arxiv 2105.12996 v1 pith:AAJI2SDN submitted 2021-05-27 astro-ph.GA

J. Cernicharo , C. Cabezas , Y. Endo , M. Agundez , B. Tercero , J. R. Pardo , N. Marcelino , P. de Vicente This is my paper · ORCID
classification astro-ph.GA
keywords hcscchhcscnabundantcyanoreactionstmc-1abundanceformation
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We report the detection, for the first time in space, of cyano thioformaldehyde (HCSCN) and propynethial (HCSCCH) towards the starless core TMC-1. Cyano thioformaldehyde presents a series of prominent a- and b-type lines, which are the strongest previously unassigned features in our Q-band line survey of TMC-1. Remarkably, HCSCN is four times more abundant than cyano formaldehyde (HCOCN). On the other hand, HCSCCH is five times less abundant than propynal (HCOCCH). Surprisingly, we find an abundance ratio HCSCCH/HCSCN of 0.25, in contrast with most other ethynyl-cyanide pairs of molecules for which the CCH-bearing species is more abundant than the CN-bearing one. We discuss the formation of these molecules in terms of neutral-neutral reactions of S atoms with CH2CCH and CH2CN radicals as well as of CCH and CN radicals with H2CS. The calculated abundances for the sulphur-bearing species are, however, significantly below the observed values, which points to an underestimation of the abundance of atomic sulphur in the model or to missing formation reactions, such as ion-neutral reactions.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Chemistry of Dark Molecular Clouds

    astro-ph.GA 2026-07 unverdicted novelty 2.0 of 10

    A comprehensive review arguing that the chemically rich cores TMC-1 CP and L1544 are representative molecular-cloud laboratories, and that complex organic molecule production is largely insensitive to metallicity.

  2. Observations of non complex organic molecules in the gas phase of the interstellar medium

    astro-ph.GA 2025-06 unverdicted

    A handbook-style review of interstellar molecule detections and abundance-determination methods, with no new research results.

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