Title

Mid-infrared spectra of dust debris around main-sequence stars

Document Type

Article

Publication Date

9-1-2004

Abstract

We report spectra obtained with the Spitzer Space Telescope in the λ = 14-35 μm range of 19 nearby mainsequence 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 μm. If the observed dust results from collisional grinding of larger solids, we infer minimum masses of the parent body population between 0.004 and 0.06 M . We estimate grain production rates of ∼10 g s around λ 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, 11, 52, and 54 AU around HR 333, HR 506, HR 1082, and HR 3927, respectively. ⊕ 10 -1

Publication Name

Astrophysical Journal, Supplement Series

Volume Number

154

First Page

453

Last Page

457

Issue Number

1

DOI

10.1086/422975

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