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Sounding-rocket microgravity experiments on alumina dust

Alumina (Al(2)O(3)) 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 α-Al(2)O(3) (corundum, most stable polymorph) is a potential origin of a 13 μm feature that appears close to stars. However, no one has di...

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Autores principales: Ishizuka, Shinnosuke, Kimura, Yuki, Sakon, Itsuki, Kimura, Hiroshi, Yamazaki, Tomoya, Takeuchi, Shinsuke, Inatomi, Yuko
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6145898/
https://www.ncbi.nlm.nih.gov/pubmed/30232326
http://dx.doi.org/10.1038/s41467-018-06359-y
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author Ishizuka, Shinnosuke
Kimura, Yuki
Sakon, Itsuki
Kimura, Hiroshi
Yamazaki, Tomoya
Takeuchi, Shinsuke
Inatomi, Yuko
author_facet Ishizuka, Shinnosuke
Kimura, Yuki
Sakon, Itsuki
Kimura, Hiroshi
Yamazaki, Tomoya
Takeuchi, Shinsuke
Inatomi, Yuko
author_sort Ishizuka, Shinnosuke
collection PubMed
description Alumina (Al(2)O(3)) 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 α-Al(2)O(3) (corundum, most stable polymorph) is a potential origin of a 13 μm feature that appears close to stars. However, no one has directly reproduced the 13 μm feature experimentally, and it has remained as a noteworthy unidentified infrared band. Here, we report nucleation experiments on Al(2)O(3) 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 Al(2)O(3) show a sharp feature at a wavelength of 13.55 μm and comparable in width to that observed near oxygen-rich AGB stars. Our finding that α-Al(2)O(3) nucleates under certain condition provides a solid basis to elaborate condensation models of dust around oxygen-rich evolved stars.
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spelling pubmed-61458982018-09-24 Sounding-rocket microgravity experiments on alumina dust Ishizuka, Shinnosuke Kimura, Yuki Sakon, Itsuki Kimura, Hiroshi Yamazaki, Tomoya Takeuchi, Shinsuke Inatomi, Yuko Nat Commun Article Alumina (Al(2)O(3)) 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 α-Al(2)O(3) (corundum, most stable polymorph) is a potential origin of a 13 μm feature that appears close to stars. However, no one has directly reproduced the 13 μm feature experimentally, and it has remained as a noteworthy unidentified infrared band. Here, we report nucleation experiments on Al(2)O(3) 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 Al(2)O(3) show a sharp feature at a wavelength of 13.55 μm and comparable in width to that observed near oxygen-rich AGB stars. Our finding that α-Al(2)O(3) nucleates under certain condition provides a solid basis to elaborate condensation models of dust around oxygen-rich evolved stars. Nature Publishing Group UK 2018-09-19 /pmc/articles/PMC6145898/ /pubmed/30232326 http://dx.doi.org/10.1038/s41467-018-06359-y Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Ishizuka, Shinnosuke
Kimura, Yuki
Sakon, Itsuki
Kimura, Hiroshi
Yamazaki, Tomoya
Takeuchi, Shinsuke
Inatomi, Yuko
Sounding-rocket microgravity experiments on alumina dust
title Sounding-rocket microgravity experiments on alumina dust
title_full Sounding-rocket microgravity experiments on alumina dust
title_fullStr Sounding-rocket microgravity experiments on alumina dust
title_full_unstemmed Sounding-rocket microgravity experiments on alumina dust
title_short Sounding-rocket microgravity experiments on alumina dust
title_sort sounding-rocket microgravity experiments on alumina dust
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6145898/
https://www.ncbi.nlm.nih.gov/pubmed/30232326
http://dx.doi.org/10.1038/s41467-018-06359-y
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