Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe..99g&link_type=abstract
"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782
Astronomy and Astrophysics
Astrophysics
Modelling_Environments
Scientific paper
Large, complex molecules are abundant in hot cores and hot corinos, regions associated with high-mass and low-mass star formation, respectively. However, recent research, notably by Geppert et al. (2006) and Horn et al. (2004), indicates that gas-phase reactions are not effcient enough to produce the large observed abundances of complex organic species. Garrod & Herbst (2006) demonstrated grain-surface formation mechanisms for methyl formate (HCOOCH3), dimethyl ether (CH3OCH3) and formic acid (HCOOH). Formation takes place via the addition of simple radicals (OH, HCO, CH3, CH3O) originating from the cosmic ray-induced photodissociation of icy mantles (at canonical zeta0). The warm-up stage of the hot core (or corino) from ~10 - 200 K allows the more strongly-bound radicals to become mobile, resulting in the formation of the larger molecules, before evaporation takes place. Here we present a much more comprehensive model based on the approach of Garrod & Herbst. We extend the chemistry to include the full set of reactions involving the radicals OH, HCO, NH, NH2, CH3, CH3O, and CH2OH, and their products, including appropriate destruction mechanisms. We show that grain- surface formation is viable for a large number of complex organics.
Garrod Robin T.
Herbst Eric
Widicus Weaver Susanna L.
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