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Inefficient Growth of SiOx Grains : Implications for Circumstellar Outflows

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Title: Inefficient Growth of SiOx Grains : Implications for Circumstellar Outflows
Authors: Kimura, Yuki Browse this author →KAKEN DB
Tanaka, Kyoko K. Browse this author
Inatomi, Yuko Browse this author
Ferguson, Frank T. Browse this author
Nuth, Joseph A III. Browse this author
Keywords: Circumstellar dust
Issue Date: 22-Jul-2022
Publisher: IOP Publishing
Journal Title: The Astrophysical journal letters
Volume: 934
Issue: 1
Start Page: L10
Publisher DOI: 10.3847/2041-8213/ac8002
Abstract: To explain observations of abundant circumstellar dust and high stellar wind velocity, most models simply postulate the efficient nucleation and growth of silicate dust particles. Here, we report measurement of the SiO-(SiOx)(n) grain sticking coefficient in a microgravity sounding rocket experiment, indicating very inefficient (0.005-0.016) grain formation from the vapor. Application of this measurement to radiative-driven winds in oxygen-rich asymptotic giant branch stars indicates that the initial grain condensate population should consist of very tiny dust particles in very large numbers. Aggregation of this dust population will produce low-dimension fractal aggregates that should couple well to the stellar radiation field and efficiently drive stellar mass loss.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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