The influence of temperature on the synthesis of molecules on icy grain mantles in dense molecular clouds

Context. Infrared observations show the presence of icy mantles along the line of sight toward young stellar objects (YSOs), where a temperature gradient is expected and indirectly observed. In this environment, icy mantles are affected by ion and UV irradiation. Laboratory experiments show that mol...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2011-04, Vol.528, p.A118
Main Authors: Garozzo, M., La Rosa, L., Kanuchova, Z., Ioppolo, S., Baratta, G. A., Palumbo, M. E., Strazzulla, G.
Format: Article
Language:English
Subjects:
astrochemistry
Astronomy
Earth, ocean, space
Exact sciences and technology
ISM: abundances
ISM: molecules
methods: laboratory
molecular processes
techniques: spectroscopic
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Summary:Context. Infrared observations show the presence of icy mantles along the line of sight toward young stellar objects (YSOs), where a temperature gradient is expected and indirectly observed. In this environment, icy mantles are affected by ion and UV irradiation. Laboratory experiments show that molecules are formed after irradiation of icy mixtures. However, most of the experiments done so far have been performed in the temperatures range of 10–20 K. Aims. To extend previous work we irradiated some icy mixtures, namely H2O:CO=10:1, H2O:CH4=4:1, and H2O:CO2=3:1 at two different temperatures (12 K and 40 or 60 K) to study the effects of temperature on the synthesis of molecules and the decrease in their parent species after ion irradiation. Methods. The experiments were performed in a high-vacuum chamber (P 
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201015341