===== On the Detection of Tetratrienediylidenesilylene =====

Six transitions of tetratrienediylidenesilylene, also known as silapentatetraenediylidene, with //J"// between 11 and 27 were detected in the circumstellar envelope of CW Leonis (IRC +10216) with the 45 m radiotelescope of the Nobeyama Radio Observatory between 36 and 86 GHz:\\
M. Ohishi, N. Kaifu, K. Kawaguchi, A. Murakami, S. Saito, S. Yamamoto, S.-I. Ishikawa, Y. Fujita, Y. Shiratori, and W. M. Irvine,\\
**[[https://ui.adsabs.harvard.edu/abs/1989ApJ...345L..83O|Detection of a new Circumstellar Carbon Chain Molecule, C<sub>4</sub>Si]]**\\
//Astrophys. J.// **345**, L83–L86 (1989).\\
\\

In their work\\
**[[https://doi.org/10.1051/0004-6361/202555902|Detection of SiC<sub>6</sub> in IRC +10216 through //Q//-band lines]]**\\
//Astron. Astrophys.// **700**, L6 (2025).\\
J. R. Pardo, J. P. Fonfría, M. Agúndez, B. Tercero, C. Cabezas, L. Velilla-Prieto, M. Guélin, P. de Vicente, and J. Cernicharo\\
reported also the secure and marginal detections of <sup>29</sup>SiC<sub>4</sub> and <sup>30</sup>SiC<sub>4</sub>, respectively, by applying the <sup>28</sup>Si/<sup>29</sup>Si and <sup>30</sup>Si/<sup>29</sup>Si raios of 15.4 and 20.3, respectively, expected for the circumstellar envelope of CW Leonis. The observations are part of a 31.0 to 50.1 GHz line survey of this source with the 40 m Yebes telescope.\\
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Contributor(s): H. S. P. Müller; 08, 2010; 08, 2025

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