Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 448, Issue 2, Pages 1288-1297Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu2603
Keywords
astrochemistry; solid state: volatile; methods: laboratory: solid state; ISM: atoms; ISM: molecules; infrared: ISM
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Funding
- European Community [238258]
- Netherlands Research School for Astronomy (NOVA)
- Netherlands Organization for Scientific Research (NWO)
- VIDI research program [700.10.427]
- Netherlands Organisation for Scientific Research (NWO)
- European Research Council [ERC-2010-StG, 259510-KISMOL]
- Marie Curie Fellowship [FP7-PEOPLE-2011-IOF-300957]
- Dutch Astrochemistry Network - Netherlands Organisation for Scientific Research (NWO)
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This study focuses on the formation of two molecules of astrobiological importance - glycolaldehyde (HC(O)CH2OH) and ethylene glycol (H2C(OH)CH2OH) - by surface hydrogenation of CO molecules. Our experiments aim at simulating the CO freeze-out stage in interstellar dark cloud regions, well before thermal and energetic processing become dominant. It is shown that along with the formation of H2CO and CH3OH - two well-established products of CO hydrogenation - also molecules with more than one carbon atom form. The key step in this process is believed to be the recombination of two HCO radicals followed by the formation of a C-C bond. The experimentally established reaction pathways are implemented into a continuous-time random-walk Monte Carlo model, previously used to model the formation of CH3OH on astrochemical time-scales, to study their impact on the solid-state abundances in dense interstellar clouds of glycolaldehyde and ethylene glycol.
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