Abundant Circumstellar Silica Dust and SiO Gas Created by a Giant Hypervelocity Collision in the ~12 Myr HD172555 System

@article{Lisse2009AbundantCS,
title={Abundant Circumstellar Silica Dust and SiO Gas Created by a Giant Hypervelocity Collision in the ~12 Myr HD172555 System},
author={Carey M. Lisse and C. Chen and Mark C. Wyatt and Andreas Morlok and Inseok Song and Geoffrey C. Bryden and Patrick D. Sheehan},
journal={arXiv: Solar and Stellar Astrophysics},
year={2009}
}
• Published 14 June 2009
• Physics, Geology
• arXiv: Solar and Stellar Astrophysics
The fine dust detected by IR emission around the nearby Beta Pic analogue star HD172555 is very peculiar. The dust mineralogy is composed primarily of highly refractory, non-equilibrium materials, with approximately three-quarters of the Si atoms in silica (SiO2) species. Tektite and obsidian lab thermal emission spectra (non-equilibrium glassy silicas found in impact and magmatic systems) are required to fit the data. The best-fit model size distribution for the observed fine dust is dn/da = a…

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