Accretion Disks around Young Objects. III. Grain Growth

We present detailed models of irradiated T Tauri disks including dust graingrowth with power-law size distributions. The models assume complete mixingbetween dust and gas and solve for the vertical disk structureself-consistentlyincluding the heating effects of stellar irradiation as wellas local viscous heating. For a given total dust mass, grain growth is found todecrease the vertical height of the surface where the optical depth to thestellar radiation becomes unit and thus the local irradiation heating, whileincreasing the disk emission at mm and sub-mm wavelengths. The resulting diskmodels are less geometrically thick than our previous models assuminginterstellar medium dust, and agree better with observed spectral energydistributions and images of edge-on disks, like HK Tau/c and HH 30. Theimplications of models with grain growth for determining disk masses fromlong-wavelength emission are considered.Comment: 29 pages, including 11 figures and 1 table, APJ accepte