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We present a new model of interstellar dust in which large grains are asingle composite material, ``astrodust,'' and nanoparticle-sized grains come indistinct varieties including polycyclic aromatic hydrocarbons (PAHs). We arguethat a single-composition model for grains larger than $\sim$0.02 $\mu$m mostnaturally explains the lack of frequency dependence in the far-infrared (FIR)polarization fraction and the characteristic ratio of optical to FIRpolarization. We derive a size distribution and alignment function for 1.4:1oblate astrodust grains that, with PAHs, reproduce the mean wavelengthdependence and polarization of Galactic extinction and emission from thediffuse interstellar medium while respecting constraints on solid phaseabundances. All model data and Python-based interfaces are made publiclyavailable.

The Astrodust+PAH Model: A Unified Description of the Extinction, Emission, and Polarization from Dust in the Diffuse Interstellar Medium