Laboratory studies of thermally processed H_2O-CH_3OH-CO_2 ice mixtures and their astrophysical implications

Details Laboratory studies of thermally processed H_2O-CH_3OH-CO_2 ice mixtures and their astrophysical implications Laboratory studies of thermally processed H_2O-CH_3OH-CO_2 ice mixtures and their astrophysical implications

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...350..240e&link_type=abstract

Astronomy and Astrophysics, v.350, p.240-253 (1999)

Astronomy and Astrophysics

Astrophysics

61

Methods: Laboratory, Ism: Abundances, Ism: Dust, Extinction, Ism: Evolution, Ism: Molecules, Infrared: Ism: Lines And Bands

Scientific paper

Data of the Infrared Space Observatory ISO have strongly influenced the current view of interstellar ice chemistry. ISO and ground-based results have confirmed that the most abundant ice species in warm regions close to massive protostars are H_2O, CO_2, and CH_3OH. Ice segregation in those environments reflects the extensive thermal processing of grains over the lifetime of protostars. We present here a systematic set of laboratory infrared spectra of ice mixtures dominated by H_2O, CO_2 and CH_3OH which have been exposed to thermal and UV irradiation processing. It is shown that the infrared bands of CO_2 and of CH_3OH are particularly sensitive to the ice composition, temperature and applied UV irradiation. The laboratory data suggest partial crystallization of interstellar ices in the protostellar environment. We present a detailed laboratory study of the CO_2 bending mode at 15.2 mu m. The observed multipeak structure of the CO_2 bending mode is a result of thermal processing and can not be produced by UV irradiation in the laboratory. Laboratory results show that annealed CO_2 ice has a lower stability against UV irradiation than cold amorphous CO_2 ice. Annealed ice mixtures containing H_2O, CO_2 and CH_3OH show that the multipeak structure of the CO_2 bending mode is not destroyed by UV fluxes of {_

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