Authors: Cernicharo, J.; Fuentetaja, R.; Cabezas, C.; Agundez, M.; Marcelino, N.; Tercero, B.; Pardo, J. R.; de Vicente, P.


Publication date: 2022/07/20

DOI: 10.1051/0004-6361/202244255

Abstract: We report the discovery of five cyano derivatives of propene towards TMC-1 with the QUIJOTE line survey: trans and cis-crotononitrile (t-CH3CHCHCN, c-CH3CHCHCN), methacrylonitrile (CH2C(CH3)CN), and gauche and cis-allyl cyanide (g-CH2CHCH2CN and c-CH2CHCH2CN). The observed transitions allowed us to derive a common rotational temperature of 7 +/- 1 K for all them. The derived column densities are N(t-CH3CHCHCN) = (5 +/- 0.5) x 10(10) cm(-2), N(c-CH3CHCHCN) = (1.3 +/- 0.2) x 10(11) cm(-2), N(CH2C(CH3)CN) = (1.0 +/- 0.1) x 10(11) cm(-2), N(g-CH2CHCH2CN) = (8.0 +/- 0.8) x 10(10) cm(-2), and N(c-CH2CHCH2CN) = (7.0 +/- 0.7) x 10(10) cm(-2), respectively. The abundance of cyano-propene relative to that of propene is thus similar to 10(-2), which is considerably lower than those of other cyano derivatives of abundant hydrocarbons. Upper limits are obtained for two ethynyl derivatives of propene (E and Z-CH3CHCHCCH).