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
The Missing Link of Sulfur Chemistry in TMC-1: The Detection of //c//-C₃H₂S 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 CH₂CCS / c-C₃H₂S is about 10 while that of HCCCHS / c-C₃H₂S is about 5.6.

In their work on the
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 CH₂CCS to HCCCHS to c-C₃H₂S ratios are about 15.4 to 6.7 to 1, in fairly good agreement with ratios obtained above.

Contributor(s): H. S. P. Müller; 04, 2025; 02, 2026