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The 10 micron silicate feature is an essential diagnostic of dust-graingrowth and planet formation in young circumstellar disks. The Spitzer SpaceTelescope has revolutionized the study of this feature, but due to its small(85cm) aperture, it cannot spatially resolve small/medium separation binaries(<3"; <420 AU) at the distances of the nearest star-forming regions (~140 pc).Large, 6-10m ground-based telescopes with mid-infrared instruments can resolvethese systems. In this paper, we spatially resolve the 0.88" binary, UY Aur,with MMTAO/BLINC-MIRAC4 mid-infrared spectroscopy. We then compare our spectrato Spitzer/IRS (unresolved) spectroscopy, and resolved images from IRTF/MIRAC2,Keck/OSCIR and Gemini/Michelle, which were taken over the past decade. We findthat UY Aur A has extremely pristine, ISM-like grains and that UY Aur B has anunusually shaped silicate feature, which is probably the result of blendedemission and absorption from foreground extinction in its disk. We also findevidence for variability in both UY Aur A and UY Aur B by comparing syntheticphotometry from our spectra with resolved imaging from previous epochs. Thephotometric variability of UY Aur A could be an indication that the silicateemission itself is variable, as was recently found in EX Lupi. Otherwise, thethermal continuum is variable, and either the ISM-like dust has never evolved,or it is being replenished, perhaps by UY Aur's circumbinary disk.

ISM Dust Grains and N-band Spectral Variability in the Spatially Resolved Subarcsecond Binary UY Aur