B. McGuire, A. Burkhardt, R. Loomis., C. Shingledecker, K. Lee, S. Charnley, M. Cordiner, E. Herbst, S. Kalenskii, E. Momjian, E. Willis, C. Xue, A. Remijan, and M. McCarthy
reported on the
Early Science from GOTHAM: Project Overview, Methods, and the Detection of Interstellar Propargyl Cyanide (HCCCH₂CN) in TMC-1
Astrophys. J. Lett. 900, Art. No. L10 (2020).
The observations were obtained in the course of the line survey Green Bank Telescope Observations of TMC-1: Hunting for Aromatic Molecules. The data were recorded with very high resolution which resolves, at least in part, the complex velocity structure and the ¹⁴N hyperfine structure splitting of the 4_1,3−3_1,2, 5_1,5−4_1,4, 5_0,5−4_0,4, and 5_1,4−4_1,3 transitions near 22.6, 26.6, 27.3, and 28.2 GHz, respectively, at the expense of noise levels of about the same level as the individual lines. The analysis was improved by employing a stacking technique.

N. Marcelino, B. Tercero, M. Agúndez and J. Cernicharo
reported shortly thereafter on
A study of C₄H₃N isomers in TMC-1: Line by line detection of HCCCH₂CN in TMC-1
Astron. Astrophys. 646, Art. No. L9 (2021).
Several a-type transitions and even some weak b-type transitions were detected in the course of their molecular line survey carried out with the Yebes 40 m radio-telescope.

Contributor(s): H. S. P. Müller; 10, 2020; 04, 2021