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The debris disks surrounding the pre-main sequence stars HD 31648 and HD163296 were observed spectroscopically between 3 and 14 microns. Both possess asilicate emission feature at 10 microns which resembles that of the star betaPictoris and those observed in solar system comets. The structure of the bandis consistent with a mixture of olivine and pyroxene material, plus anunderlying continuum of unspecified origin. The similarity in both size andstructure of the silicate band suggests that the material in these systems hada processing history similar to that in our own solar system prior to the timethat the grains were incorporated into comets.Comment: 17 pages, AASTeX, 5 eps figures, accepted for publication in Ap.

Cometary Dust in the Debris Disks of HD 31648 and HD 163296: Two “Baby” β Pictoris Stars