Modelling complex organic molecules in dense regions: Eley–Rideal and complex induced reaction

Recent observations have revealed the existence of complex organic molecules (COMs) in cold dense cores and pre-stellar cores. The presence of these molecules in such cold conditions is not well understood and remains a matter of debate since the previously proposed 'warm-up' scenario cann...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2015-03, Vol.447 (4), p.4004-4004
Main Authors: Ruaud, M, Loison, J C, Hickson, K M, Gratier, P, Hersant, F, Wakelam, V
Format: Article
Language:English
Subjects:
Astronomical instruments
Astronomy
Astrophysics
Carbon
Cold
COM
Cosmology and Extra-Galactic Astrophysics
Desorption
Dust
Experiments
Formations
Gas phases
Molecules
Physics
Sciences of the Universe
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Summary:Recent observations have revealed the existence of complex organic molecules (COMs) in cold dense cores and pre-stellar cores. The presence of these molecules in such cold conditions is not well understood and remains a matter of debate since the previously proposed 'warm-up' scenario cannot explain these observations. In this paper, we study the effect of Eley-Rideal and complex induced reaction mechanisms of gas-phase carbon atoms with the main ice components of dust grains on the formation of COMs in cold and dense regions. Based on recent experiments, we use a low value for the chemical desorption efficiency (which was previously invoked to explain the observed COM abundances). We show that our introduced mechanisms are efficient enough to produce a large amount of COMs in the gas phase at temperatures as low as 10 K.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stu2709