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Article overview
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Unified Microscopic-Macroscopic Monte Carlo Simulations of Complex Organic Molecule Chemistry in Cold Cores | | Qiang Chang
; Eric Herbst
; | | Date: |
13 Mar 2016 | | Abstract: | The recent discovery of methyl formate and dimethyl ether in the gas phase of
cold cores with temperatures as cold as 10 K challenges our previous
astrochemical models concerning the formation of complex organic molecules. The
strong correlation between the abundances and distributions of methyl formate
and dimethyl ether further shows that current astrochemical models may be
missing important chemical processes in cold astronomical sources. We
investigate a scenario in which complex organic molecules and the methoxy
radical can be formed on dust grains via a so-called "chain reaction"
mechanism, in a similar manner to CO$_2$. A unified gas-grain
microscopic-macroscopic Monte Carlo approach with both normal and interstitial
sites for icy grain mantles is used to perform the chemical simulations.
Reactive desorption with varying degrees of efficiency is included to enhance
the non-thermal desorption of species formed on cold dust grains. In addition,
varying degrees of efficiency for the surface formation of methoxy are also
included. The observed abundances of a variety of organic molecules in cold
cores can be reproduced in our models. The strong correlation between the
abundances of methyl formate and dimethyl ether in cold cores can also be
explained. Non-diffusive chemical reactions on dust grain surfaces may play a
key role in the formation of some complex organic molecules. | | Source: | arXiv, 1603.4011 | | Services: | Forum | Review | PDF | Favorites | |
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