Infrared Study of Ion-Irradiated Water-Ice Mixtures with Hydrocarbons Relevant to Comets

Physics

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Scientific paper

Ethane, methane, and acetylene were detected in Comets C/1996 B2 Hyakutake and C/1995 O1 Hale-Bopp. In order to investigate the possibility of condensed-phase synthesis of C_2H_6 in interstellar ices, we have examined the role of CH_4 and C_2H_2 in the radiation synthesis of C_2H_6 in laboratory-formed low-temperature ices. Mixtures such as H_2O + CH_4, H_2O + C_2H_2, H_2O + CH_4 + C_2H_2 were irradiated. Many mixtures were investigated using different concentrations of hydrocarbons. Results showed that yields of C_2H_6 from CH_4 due to dimerization, were similar to yields of C_2H_6 from C_2H_2 due to H-addition reactions. However, CH_4 was not a source of C_2H_2, suggesting that C_2H_2 is part of the natal chemistry of these comets. Both CH_3OH and C_2H_5OH were identified in our experiments along with CO, CO_2, HCO, H_2CO, and CH_3CHO.

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