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We present high sensitivity sub-arcsecond resolution images of the Herbig Aestar AB Aurigae at 11.6 and 18.5 microns taken with Michelle on Gemini North.Bright extended dust emission close to the star is resolved at bothwavelengths, with quadratically subtracted FWHM of 17+/-4 AU at 11.6 micronsand 22+/-5 AU at 18.5 microns. Additional, fainter emission is detected out toa radius of 280 AU at 11.6 microns and 350 AU at 18.5 microns down to thesensitivity limit of the observations. The latter value is identical to themeasured size of the millimeter-continuum disk, but much smaller than the COdisk. Assuming moderately absorbing material, we find that larger particles (~1 microns) dominate the mid-IR emission in the inner (< 100 AU) regions of thedisk, and smaller particles (< 0.3 microns) dominate in the outer regions ofthe disk. A model of a nearly face-on passive flared disk with an inner rimaccounts well for our observations

Mid‐Infrared Imaging of the Herbig Ae Star AB Aurigae: Extended Emission on Several Scales