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Modification of Dust Grain Structure by Sputtering

Gray, Malcolm David and Edmunds, Michael Geoffrey 2004. Modification of Dust Grain Structure by Sputtering. Monthly Notices of the Royal Astronomical Society 349 (2) , 491- 502. 10.1111/j.1365-2966.2004.07502.x

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We have applied the srim computer code to study the sputtering of some likely astrophysical grain materials, and we have shown that selective embedding of metallic projectiles offers a partial explanation of gas-phase depletions. We show that supernova shockwaves sweep a significantly larger mass of interstellar gas per unit time than the shockwaves generated by outflows in star-forming regions. We apply our sputtering model to the bombardment levels expected in a supernova shock, and show that net embedding may dominate over net sputtering, leading to grain growth under some circumstances, particularly when the bombarding gas is enriched with metals from the supernova progenitor star. A combination of short cooling times and net embedding means that it is possible for a Type II supernova to generate more dust than it destroys, and we conclude that, in general, the sputtering process often leads to a compositional change in the grain material rather than simply to grain erosion.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Uncontrolled Keywords: Atomic processes ; Dust, extinction ; ISM: evolution
ISSN: 0035-8711
Last Modified: 04 Jun 2017 01:41

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