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Sounding-rocket microgravity experiments on alumina dust

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Title: Sounding-rocket microgravity experiments on alumina dust
Authors: Ishizuka, Shinnosuke Browse this author
Kimura, Yuki Browse this author →KAKEN DB
Sakon, Itsuki Browse this author
Kimura, Hiroshi Browse this author
Yamazaki, Tomoya Browse this author
Takeuchi, Shinsuke Browse this author
Inatomi, Yuko Browse this author
Keywords: microgravity experiments
alumina dust
Issue Date: 19-Sep-2018
Publisher: Nature Publishing Group
Journal Title: Nature communications
Volume: 9
Start Page: 3820
Publisher DOI: 10.1038/s41467-018-06359-y
Abstract: Alumina (Al2O3) is believed to be the first major condensate to form in the gas outflow from oxygen-rich evolved stars because of the refractoriness and that alpha-Al2O3. (corundum, most stable polymorph) is a potential origin of a 13 mu m feature that appears close to stars. However, no one has directly reproduced the 13 mu m feature experimentally, and it has remained as a noteworthy unidentified infrared band. Here, we report nucleation experiments on Al2O3 nanoparticles monitored by a specially designed infrared spectrometer in the microgravity environment of a sounding rocket. The conditions approximate to those around asymptotic giant branch (AGB) stars. The measured spectra of the nucleated Al2O3 show a sharp feature at a wavelength of 13.55 mu m and comparable in width to that observed near oxygen-rich AGB stars. Our finding that alpha-Al(2)O(3 )nucleates under certain condition provides a solid basis to elaborate condensation models of dust around oxygen-rich evolved stars.
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)

Submitter: 木村 勇気

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