A Spitzer Study of Dusty Disks around Nearby, Young Stars

Chen, C. H., Patten, B. M., Werner, M. W., Dowell, C. D., Stapelfeldt, K. R., Song, I., Stauffer, J. R., Blaylock, M., Gordon, K. D., & Krause, V.
2005, The Astrophysical Journal, 634, 1372

We have obtained Spitzer Space Telescope MIPS (Multiband Imaging Photometer for Spitzer) observations of 39 A- through M-type dwarfs, with estimated ages between 12 and 600 Myr; IRAC observations for a subset of 11 stars; and follow-up CSO SHARC II 350 ЮМm observations for a subset of two stars. None of the objects observed with IRAC possess infrared excesses at 3.6-8.0 ЮМm however, seven objects observed with MIPS possess 24 and/or 70 ЮМm excesses. Four objects (ЮК Phe, HD 92945, HD 119124, and AU Mic), with estimated ages 12-200 Myr, possess strong 70 ЮМm excesses, >=100% larger than their predicted photospheres, and no 24 ЮМm excesses, suggesting that the dust grains in these systems are cold. One object (HD 112429) possesses moderate 24 and 70 ЮМm excesses with a color temperature, Tgr=100 K. Two objects (ЮБ1 Lib and HD 177724) possess such strong 24 ЮМm excesses that their 12, 24, and 70 ЮМm fluxes cannot be self-consistently modeled using a modified blackbody despite a 70 ЮМm excess >2 times greater than the photosphere around ЮБ1 Lib. The strong 24 ЮМm excesses may be the result of emission in spectral features, as observed toward the Hale-Bopp star HD 69830.

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