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We report the discovery of two unsaturated organic species,trans-(E)-cyanovinylacetylene and vinylcyanoacetylene, using the second datarelease of the GOTHAM deep survey towards TMC-1 with the 100 m Green BankTelescope. For both detections, we performed velocity stacking and matchedfilter analyses using Markov chain Monte Carlo simulations, and fortrans-(E)-cyanovinylacetylene, three rotational lines were observed at lowsignal-to-noise (${\sim}$3$\sigma$). From this analysis, we derive columndensities of $2\times10^{11}$ and $3\times10^{11}$ cm$^{-2}$ forvinylcyanoacetylene and trans-(E)-cyanovinylacetylene, respectively, and anupper limit of $<2\times10^{11}$ cm$^{-2}$ for trans-(Z)-cyanovinylacetylene.Comparisons with G3//B3LYP semi-empirical thermochemical calculations indicateabundances of the [H$_3$C$_5$N}] isomers are not consistent with theirthermodynamic stability, and instead their abundances are mainly driven bydynamics. We provide discussion into how these species may be formed in TMC-1,with reference to related species like vinyl cyanide (CH$_2$=CHCN). As part ofthis discussion, we performed the same analysis for ethyl cyanide(CH$_3$CH$_2$CN), the hydrogenation product of CH$_2$=CHCN. This analysisprovides evidence -- at 4.17$\sigma$ significance -- an upper limit to thecolumn density of $<4\times10^{11}$ cm$^{-2}$; an order of magnitude lower thanprevious upper limits towards this source.

Discovery of Interstellar trans-cyanovinylacetylene (HCCCH=CHCN) and vinylcyanoacetylene (H$_2$C=CHC$_3$N) in GOTHAM Observations of TMC-1