Poster

Chemical Composition of the Interstellar Grain Mantle

¹Ankan Das, ^2,1Sandip Chakrabarti (¹Indian Centre for Space Physics, ²S N Bose National Centre for Basic Sciences)

We performed a Monte Carlo simulation for a wide set of parameters to ascertain the parameter space in which the most abundant grain phase molecules are produced in the observed range. Chemical composition of the grain mantle is found to be highly sensitive to the physical parameters associated with a molecular cloud. Interstellar photons are seen to play an important role via photo-dissociation and photo-evaporation towards the chemical composition of the interstellar grain mantle. We have tested the effects of photo-reactions by varying the number of layers which could be affected by it. Model calculations are carried out for a realistic time dependent case (i.e., extinction parameter and number density of the cloud both are changing with time) to follow the chemical evolution during the collapsing phase of a proto-star. Different routes to the formation of water molecules are extensively studied and it is noticed that around the dense region, the production of water molecules via O₃ and H₂O₂ contributes significantly.

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