We apply the Finkbeiner et al. (1999) two-component thermal dust emission model to the Planck HFI maps. This parametrization of the far-infrared dust spectrum as the sum of two modified blackbodies serves as an important alternative to the commonly adopted single modified blackbody (MBB) dust emission model. Analyzing the joint Planck/DIRBE dust spectrum, we show that two-component models provide a better fit to the 100-3000 GHz emission than do single-MBB models, though by a lesser margin than found by Finkbeiner et al. (1999) based on FIRAS and DIRBE. We also derive full-sky 6.1 arcminute resolution maps of dust optical depth and temperature by fitting the two-component model to Planck 217, 353, 545, and 857 GHz along with DIRBE/IRAS 100 micron data. Because our two-component model matches the dust spectrum near its peak, accounts for the flattening of the dust spectrum at millimeter wavelengths, and specifies dust temperature at 6.1 arcminute FWHM, our model provides reliable, high-resolution thermal dust emission foreground predictions from 100 GHz to 3000 GHz.
