Mid-Infrared Spectra of Dust Debris Around Main-Sequence Stars

Details Mid-Infrared Spectra of Dust Debris Around Main-Sequence Stars Mid-Infrared Spectra of Dust Debris Around Main-Sequence Stars

2004-05-31

arxiv.org/abs/astro-ph/0405632v1

Astronomy and Astrophysics

Astrophysics

11 pages, 1 figure, ApJ Supplement, Spitzer special issue, in press

Scientific paper

10.1086/422975

We report spectra obtained with the Spitzer Space Telescope in the wavelength range between 14 microns and 35 microns of 19 nearby main-sequence stars with infrared excesses. The six stars with strong dust emission show no recognizable spectral features, suggesting that the bulk of the emitting particles have diameters larger than 10 microns. If the observed dust results from collisional grinding of larger solids, we infer minimum masses of the parent body population between 0.004 of the Earth's mass and 0.06 of the Earth's mass. We estimate grain production rates of 10 Gg/s around lambda Boo and HR 1570; selective accretion of this matter may help explain their peculiar surface abundances. There appear to be inner truncations in the dust clouds at 48 AU, 11 AU, 52 AU and 54 AU around HR 333, HR 506, HR 1082 and HR 3927, respectively.

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