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We predict that cyanoacetylene (HC$_3$N) is produced photochemically in theatmosphere of GJ 1132 b in abundances detectable by the James Webb SpaceTelescope (JWST), assuming that the atmosphere is hydrogen dominated and richin molecular nitrogen (N$_2$), methane (CH$_4$) and hydrogen cyanide (HCN), asdescribed by Swain et al. (2021). First, we construct line list andcross-sections for HC$_3$N. Then we apply these cross-sections and the modelatmosphere of Swain et al. (2021) to a radiative transfer model in order tosimulate the transmission spectrum of GJ 1132 b as it would be seen by JWST,accounting for the uncertainty in the retrieved abundances. We predict thatcyanoacetylene features at various wavelengths, with a clear lone feature at4.5 $\mu$m, observable by JWST after one transit. This feature persists withinthe $1-\sigma$ uncertainty of the retrieved abundances of HCN and CH$_4$. Thesignal is detectable for stratospheric temperatures $\lesssim 600$ K andmoderate stratospheric mixing ($10^6 \, {\rm cm^2 \, s^{-1}} \lesssim K_{zz}\lesssim 10^8 \, {\rm cm^2 \, s^{-1}}$). Our results also indicate that HC$_3$Nis an important source of opacity that future retrieval models should consider.

Detectable Abundance of Cyanoacetylene (HC$_3$N) Predicted on Reduced Nitrogen-Rich Super-Earth Atmospheres