Mid-Infrared Spectra of Dust Debris Around Main-Sequence Stars
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0405632,
title = {Mid-Infrared Spectra of Dust Debris Around Main-Sequence Stars},
author = {M. Jura and C. H. Chen and E. Furlan and J. Green and B. Sargent and W. J. Forrest and D. M. Watson and D. J. Barry and P. Hall and T. L. Herter and J. R. Houck and G. C. Sloan and K. Uchida and P. D. 'Alessio and B. R. Brandl and L. D. Keller and F. Kemper and P. Morris and J. Najita and N. Calvet and L. Hartmann and P. C. Myers},
journal= {arXiv preprint arXiv:astro-ph/0405632},
year = {2016}
}
Comments
11 pages, 1 figure, ApJ Supplement, Spitzer special issue, in press