===== On Cyclopropenethione in the ISM =====

A. J. Remijan, P. B. Changala, C. Xue, E. Q. H. Yuan, M. Duffy, H. N. Scolati, C. N. Shingledecker, T. H. Speak, I. R. Cooke, R. Loomis, A. M. Burkhardt, Z. T. P. Fried, G. Wenzel, A. Lipnicky, M. C. McCarthy, and B. A. McGuire\\
announced\\
**[[https://doi.org/10.3847/1538-4357/adb84c|The Missing Link of Sulfur Chemistry in TMC-1: The Detection of //c//-C<sub>3</sub>H<sub>2</sub>S from the GOTHAM Survey]]**\\
//Astrophys. J.// **982**, Art. No. 191 (2025).\\
The molecule was identified through line-stacking in the course of the GOTHAM survey of TMC-1 carried out with the 100 m GBT dish and covering a large fraction of the 3.9 to 36.4 GHz region. An excitation temperature of ~5 K was derived. The abundance ratio of CH<sub>2</sub>CCS / //c//-C<sub>3</sub>H<sub>2</sub>S is about 10 while that of HCCCHS / //c//-C<sub>3</sub>H<sub>2</sub>S is about 5.6.\\
\\

In their work on the\\
**[[https://doi.org/10.1051/0004-6361/202557355|Discovery of Linear Propadienone — Study of the Chemistry of Linear and Cyclic H2C3O and H2C3S in TMC-1]]**\\
//Astron. Astrophys.// **705**, Art. No. A206 (2026),\\
G. Esplugues, J. C. Loison, M. Agúndez, G. Molpeceres, N. Marcelino, B. Tercero, and J. Cernicharo\\
also identify cyclopropenethione in a line by line way. Their CH<sub>2</sub>CCS to HCCCHS to //c//-C<sub>3</sub>H<sub>2</sub>S ratios are about 15.4 to 6.7 to 1, in fairly good agreement with ratios obtained above.\\
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Contributor(s): H. S. P. Müller; 04, 2025; 02, 2026

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