Journal
ASTROPHYSICAL JOURNAL
Volume 842, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa74dc
Keywords
astrochemistry; infrared: ISM; ISM: atoms; ISM: molecules; methods: laboratory: solid state
Categories
Funding
- NWO (the Netherlands Organization for Scientific Research)
- A-ERC grant [291141 CHEMPLAN]
- NOVA (the Netherlands Research School for Astronomy)
- Royal Netherlands Academy of Arts and Sciences (KNAW)
- European Union's Horizon research and innovation program [664931]
- Royal Society
- Holland Research School for Molecular Spectroscopy (HRSMC)
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Observational studies reveal that complex organic molecules (COMs) can be found in various objects associated with different star formation stages. The identification of COMs in prestellar cores, i.e., cold environments in which thermally induced chemistry can be excluded and radiolysis is limited by cosmic rays and cosmic-ray-induced UV photons, is particularly important as this stage sets up the initial chemical composition from which ultimately stars and planets evolve. Recent laboratory results demonstrate that molecules as complex as glycolaldehyde and ethylene glycol are efficiently formed on icy dust grains via nonenergetic atom addition reactions between accreting H atoms and CO molecules, a process that dominates surface chemistry during the CO freeze-out stage in dense cores. In the present study we demonstrate that a similar mechanism results in the formation of the biologically relevant molecule glycerol-HOCH2CH(OH)CH2OH-a three-carbon-bearing sugar alcohol necessary for the formation of membranes of modern living cells and organelles. Our experimental results are fully consistent with a suggested reaction scheme in which glycerol is formed along a chain of radical-radical and radical-molecule interactions between various reactive intermediates produced upon hydrogenation of CO ice or its hydrogenation products. The tentative identification of the chemically related simple sugar glyceraldehyde-HOCH2CH(OH)CHO-is discussed as well. These new laboratory findings indicate that the proposed reaction mechanism holds much potential to form even more complex sugar alcohols and simple sugars.
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