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On SiC<sub>2n+1</sub> (n ≥ 1) Radicals around CW Leonis
J. Cernicharo, J. R. Pardo, M. Agúndez, J. P. Fonfría, L. Velilla-Prieto, C. Cabezas, B. Tercero, P. de Vicente and M. Guélin
announced
Detection of the linear SiC3 and SiC5 radicals in IRC+10216
Astron. Astrophys. 700, Art. No. L20 (2025).
Propadienediylidenesilylene and pentatetraenediylidenesilylene, which are also known as silatetratrienediylidene and silahexapentaenediylidene, respectively, were detercted in their 3Σ− ground electronic states in the envelopes of the prototypical carbon-rich late-type AGB star CW Leonis in the course of a molecular line survey in the 31.0 to 50.3 GHz region carried out with the 40 m Yebes telescope.
In the case of propadienediylidenesilylene (SiC3), all three strong fine structure (FS) components with ΔJ = ΔN of the four transitions with 5 ≤ N ≤ 9 were covered. Two FS components were heavily blended, the other ones unblended or partially blended, though the ones pertaining to the highest N have a rather modest signal-to-noise ratio.
The abundance ratios of NCS/NC3S is about 5.6.
Contributor(s): H. S. P. Müller; 09, 2025