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• W4283818172 abstract "ABSTRACT Observations of gaseous complex organic molecules (COMs) in cold starless and prestellar cloud cores require efficient desorption of the COMs and their parent species from icy mantles on interstellar grains. With a simple astrochemical model, we investigate if mechanical removal of ice fragments in oblique collisions between grains in two size bins (0.01 and 0.1 µm) can substantially affect COM abundances. Two grain collision velocities were considered – 10 and 50 m s−1, corresponding to realistic grain relative speeds arising from ambipolar diffusion and turbulence, respectively. From the smaller grains, the collisions are assumed to remove a spherical cap with height equal to 1/3 and 1 ice mantle thickness, respectively. We find that the turbulence-induced desorption can elevate the gas-phase abundances of COMs by several orders of magnitude, reproducing observed COM abundances within an order of magnitude. Importantly, the high gaseous COM abundances are attained for long time-scales of up to 1 Myr and for a rather low methanol ice abundance, common for starless cores. The simple model, considering only two grain size bins and several assumptions, demonstrates a concept that must be tested with a more sophisticated approach." @default.
• W4283818172 created "2022-07-06" @default.
• W4283818172 creator A5025364456 @default.
• W4283818172 creator A5053723792 @default.
• W4283818172 date "2022-06-29" @default.
• W4283818172 modified "2023-10-02" @default.
• W4283818172 title "Icy molecule desorption in interstellar grain collisions" @default.
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• W4283818172 doi "https://doi.org/10.1093/mnras/stac1792" @default.
• W4283818172 hasPublicationYear "2022" @default.
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