Observations and Models of the Debris Disk around the K dwarf HD 92945

HD 92945 is a young (~100 Myr), nearby (~22 pc) K1V star from which IRAS and Spitzer detected excess infrared emission consistent with the presence cold (~40 K) circumstellar dust. Coronagraphic V- and I-band images obtained in 2004 and 2005 with HST's Advanced Camera for Surveys reveal scattered light from a moderately inclined disk extending to ~8 from the star. The disk has a strikingly uniform morphology with a shallow surface brightness profile within ~5.5 from the star. Beyond this distance, the surface brightness drops precipitously. The disk's V-I color appears neutral. Coronagraphic images with HST's NICMOS show no scattered light above the residuals of the subtracted wings of the occulted star, which confirms that the disk is not red like those observed around earlier type stars. We present results of models of the scattered-light ACS images and the infrared spectral energy distribution of the disk derived from unresolved images obtained with the Multiband Imaging Photometer for Spitzer (MIPS) and the CSO SHARC-II camera.