G. Wenzel, S. Gong, C. Xue, P. B. Changala, M. S. Holdren, T. H. Speak, D. A. Stewart, Z. T. P. Fried, R. H. J. Willis, E. A. Bergin, A. M. Burkhardt, A. N. Byrne, S. B. Charnley, A. Lipnicky, R. A. Loomis, C. N. Shingledecker, I. R. Cooke, M. C. McCarthy, A. J. Remijan, A. E. Wendlandt, and B. A. McGuire
a<nnounced the
Discovery of the Seven-ring Polycyclic Aromatic Hydrocarbon Cyanocoronene (C₂₄H₁₁CN) in GOTHAM Observations of TMC-1
Astrophys. J. Lett. 984, Art. No. L36 (2025).
The molecule was identified in the course of the GOTHAM survey of TMC-1 carried out with the 100 m GBT dish. Several oblate paired a-type rotational transitions were observed. Several of these had an S/N of about 3; stacking improved the result. The derived column density is comparable to many related aromatic cyano derivatives, highest among individual presently known ones. A rotational temperature of 6 K was derived with great accuracy.

Contributor(s): H. S. P. Müller; 05, 2025