EAS Publications Series
Volume 58, 2012ECLA - European Conference on Laboratory Astrophysics
|Page(s)||327 - 331|
|Published online||13 February 2013|
C. Stehlé, C. Joblin and L. d’Hendecourt (eds)
EAS Publications Series, 58 (2012) 327-331
Laboratory H2O:CO2 ice desorption: entrapment and its parameterization with an extended three-phase model
1 Sackler Laboratory for Astrophysics,
Leiden Observatory, Leiden University, PO Box 9513, 2300 RA
2 Harvard-Smithsonian Center for Astrophysics, MS 42, 60 Garden Street, Cambridge, MA 02138, USA
3 Institute for Molecules and Materials, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
4 Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109-1042, USA
Ice desorption affects the evolution of the gas-phase chemistry during the protostellar stage, and also determines the ice composition of comets forming in circumstellar disks. From observations, most volatile species, including CO2, are found in H2O-dominated ices. In this study, the desorption of CO2 mixed in H2O ice and the impact of ice thickness, mixture ratio and heating rate are experimentally determined. The results are used to parametrize an extended three-phase model (gas, ice surface and ice mantle) which describes ice mixture desorption using rate equations and a minimum number of free parameters. The model can be used to predict the evolution in thickness and concentration of volatile-rich H2O ice during infall of icy grains around protostars.
© The Author(s) 2013
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