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}
}
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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References

SHOWING 1-10 OF 73 REFERENCES
Circumstellar Dust Created by Terrestrial Planet Formation in HD 113766
We present an analysis of the gas-poor circumstellar material in the HD 113766 binary system (F3/F5, 10-16 Myr), recently observed by the Spitzer Space Telescope. For our study we have used the IR
Warm dust in the terrestrial planet zone of a Sun-like Pleiades star: Collisions between planetary embryos?
Only a few solar-type main-sequence stars are known to be orbited by warm dust particles; the most extreme is the G0 field star BD +20 307 that emits ~4% of its energy at mid-infrared wavelengths. We
On the Nature of the Dust in the Debris Disk around HD 69830
We have used the infrared mineralogical model derived from the Spitzer IRS observations of the Deep Impact experiment to study the nature of the dust in the debris found around the K0 V star HD
An early extrasolar planetary system revealed by planetesimal belts in β Pictoris
TLDR
It is reported that the sub-micrometre amorphous silicate grains around β Pic have peaks in their distribution around 6, 16 and 30’au (1 au is the Sun–Earth distance), whereas the crystalline and micrometr-sized amorphously silicategrain grains are concentrated in the disk centre.
Dust Processing In Disks Around T Tauri Stars In The Taurus/Auriga Star-forming Region
The 8-14 μm emission spectra of 12 T Tauri stars in the Taurus/Auriga dark clouds and in the TW Hydrae association obtained with the Infrared Spectrograph (IRS) on board Spitzer are analyzed.
Extreme collisions between planetesimals as the origin of warm dust around a Sun-like star
TLDR
An exceptionally large amount of warm, small, silicate dust particles around the solar-type star BD+20 307 (HIP 8920, SAO 75016) are reported, which could be explained by recent frequent or huge collisions between asteroids or other ‘planetesimals’ whose orbits are being perturbed by a nearby planet.
Resolving the Inner Cavity of the HD 100546 Disk: A Candidate Young Planetary System?*
The inner 100 AU of HD 100546 is studied via far-ultraviolet long-slit spectroscopy with the Hubble Space Telescope Space Telescope Imaging Spectrograph (STIS). The star is surrounded by reflection
Spitzer Spectral Observations of the Deep Impact Ejecta
TLDR
Spitzer Space Telescope imaging spectrometer observations of comet 9P/Tempel 1 during the Deep Impact encounter returned detailed, highly structured, 5- to 35-micrometer spectra of the ejecta, and the atomic abundance of the observed material is consistent with solar and C1 chondritic abundances.
THE DUST CLOUD AROUND THE WHITE DWARF G 29-38. II. SPECTRUM FROM 5 TO 40 μm AND MID-INFRARED PHOTOMETRIC VARIABILITY
We model the mineralogy and distribution of dust around the white dwarf G29-39 using the infrared spectrum from 1 to 35 μm. The spectral model for G29-38 dust combines a wide range of materials based
TRANSIENCE OF HOT DUST AROUND SUN-LIKE STARS
In this paper a simple model for the steady state evolution of debris disks due to collisions is developed and confronted with the properties of the emerging population of seven Sun-like stars that
...
...