C. Cabezas, K. Vávra, G. Molpeceres, L. Kolesniková, M. Agúndez, G. Vylitová, N. Marcelino, L. Hrubčík, R. Fuentetaja, T. Uhlíková, B. Tercero, J. Koucký, G. Esplugues, P. Kania, P. de Vicente, Š. Urban, and J. Cernicharo
reported on the
Discovery of propenethial (CH₂CHCHS) in TMC-1 — The sulphur analogue of acrolein
Astron. Astrophys. 693, Art. No. L20 (2025).
Propenethial, also known as thioacrolein, was identified through four a-type transitions with J = 3 − 2 and 4 − 3 and K_a ≤ 1 in the course of a molecular line survey of the prototypical cold dark molecular cloud TMC-1 carried out with the Yebes 40 m radio telescope between 31.0 and 50.4 GHz. The transitions displayed resolved methyl internal rotation splitting; the E component of 3₀₃ − 2₀₂ is blended. A value of T_rot = 9 K was assumed. Its column density is about a factor of 36 lower than that of acetaldehyde.

Contributor(s): H. S. P. Müller; 06, 2025