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IN SITU INFRARED MEASUREMENTS OF FREE-FLYING SILICATE DURING CONDENSATION IN THE LABORATORY

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Title: IN SITU INFRARED MEASUREMENTS OF FREE-FLYING SILICATE DURING CONDENSATION IN THE LABORATORY
Authors: Ishizuka, Shinnosuke Browse this author
Kimura, Yuki Browse this author →KAKEN DB
Sakon, Itsuki Browse this author
Keywords: circumstellar matter
infrared: ISM
methods: laboratory: solid state
solid state: refractory
Issue Date: 21-Apr-2015
Publisher: IOP Publishing Ltd
Journal Title: The Astrophysical journal
Volume: 803
Issue: 2
Start Page: 88
Publisher DOI: 10.1088/0004-637X/803/2/88
Abstract: We developed a new experimental system for infrared (IR) measurements on free-flying nucleating nanoparticles in situ and applied it to studies on silicate particles. We monitored the condensation of magnesium-bearing silicate nanoparticles from thermally evaporated magnesium and silicon monoxide vapor under an atmosphere of oxygen and argon. The IR spectrum of newly condensed particles showed a spectral feature for non-crystalline magnesium-bearing silicate that is remarkably consistent with the IR spectrum of astronomically observed non-crystalline silicate around oxygen-rich evolved stars. The silicate crystallized at <500 K and eventually developed a high crystallinity. Because of the size effects of nanoparticles, the silicate would be expected to be like a liquid at least during the initial stages of nucleation and growth. Our experimental results therefore suggest decreasing the possible formation temperature of crystalline silicates in dust formation environments with relatively higher pressure.
Rights: This is an author-created, un-copyedited version of an article accepted for publication in [The Astrophysical Journal]. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at [http://dx.doi.org/10.1088/0004-637X/803/2/88].
Type: article (author version)
URI: http://hdl.handle.net/2115/61362
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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