A Survey of 10-Micron Silicate Emission from Dust around Young Sun-Like Stars

Details A Survey of 10-Micron Silicate Emission from Dust around Young Sun-Like Stars A Survey of 10-Micron Silicate Emission from Dust around Young Sun-Like Stars

2003-07-22

arxiv.org/abs/astro-ph/0307398v1

New Astron. 9 (2004) 33-42

Astronomy and Astrophysics

Astrophysics

19 total pages, 5 Postscript figures, 2 tables, Latex

Scientific paper

We obtained low resolution (R = 100) mid-infrared (8-13 micron wavelengths) spectra of 8 nearby young main sequence stars with the Keck 1 telescope and Long-Wavelength Spectrometer (LWS) to search for 10 micron silicate (Si-O stretch) emission from circumstellar dust. No stars exhibited readily apparent emission: Spectra were then analyzed by least-squares fitting of a template based on a spectrum of Comet Hale-Bopp. Using this technique, we were able to constrain the level of silicate emission to a threshold ten times below what was previously possible from space. We found one star, HD 17925, with a spectrum statistically different from its calibrator and consistent with a silicate emission peak of 7% of the photosphere at a wavelength of 10 microns. Excess emission at 60 microns from this star has already been reported.

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