Detection of the linear SiC₃ and SiC₅ radicals in IRC+10216

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Authors detected SiC_3 and SiC_5 radicals in IRC+10216, revealing their column densities and suggesting formation processes.

The study detected SiC_3 and SiC_5 radicals in IRC+10216 using an ultrasensitive line survey.
Column densities for l-SiC_3 and l-SiC_5 were found to be (3.6±0.4)×10^12 cm^-2 and (1.8±0.2)×10^12 cm^-2, respectively.
The linear SiC_3 radical appears to be about 50% less abundant than its prolate isomer based on recent observations.
The findings suggest possible synthesis routes involving ion-neutral and neutral-neutral reactions in the circumstellar envelope.

Cernicharo et al. (2025) studied this question.

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