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Title:
Accretion Disks around Young Objects. III. Grain Growth
Authors:
D'Alessio, Paola; Calvet, Nuria; Hartmann, Lee
Affiliation:
AA(; Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192 .; Instituto de Astronomía, UNAM, Ap. Postal 70-264, Cd. Universitaria, 04510 México D.F., México.), AB(; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , .), AC(; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , .)
Publication:
The Astrophysical Journal, Volume 553, Issue 1, pp. 321-334. (ApJ Homepage)
Publication Date:
05/2001
Origin:
UCP
ApJ Keywords:
Accretion, Accretion Disks, Stars: Circumstellar Matter, Stars: Formation, Stars: Pre-Main-Sequence
DOI:
10.1086/320655
Bibliographic Code:
2001ApJ...553..321D

Abstract

We present detailed models of irradiated T Tauri disks including dust grain growth with power-law size distributions. The models assume complete mixing between dust and gas and solve for the vertical disk structure self-consistently including the heating effects of stellar irradiation as well as local viscous heating. For a given total dust mass, grain growth is found to decrease the vertical height of the surface where the optical depth to the stellar radiation becomes unity and thus the local irradiation heating, while increasing the disk emission at mm and submillimeter wavelengths. The resulting disk models are less geometrically thick than our previous models assuming interstellar medium dust, and agree better with observed spectral energy distributions and images of edge-on disks, like HK Tau/c and HH 30. The implications of models with grain growth for determining disk masses from long-wavelength emission are considered.

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