Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-06-04
Astrophys.J.490:368-376,1997
Astronomy and Astrophysics
Astrophysics
29 LaTeX pages w/ 10 eps. figures, aaspp4.sty, final version with few minor stylistic alterations and 1 content change (sectio
Scientific paper
10.1086/304869
We derive hydrostatic, radiative equilibrium models for passive disks surrounding T Tauri stars. Each disk is encased by an optically thin layer of superheated dust grains. This layer re-emits directly to space about half the stellar energy it absorbs. The other half is emitted inward and regulates the interior temperature of the disk. The heated disk flares. As a consequence, it absorbs more stellar radiation, especially at large radii, than a flat disk would. The portion of the spectral energy distribution contributed by the disk is fairly flat throughout the thermal infrared. At fixed frequency, the contribution from the surface layer exceeds that from the interior by about a factor 3 and is emitted at more than an order of magnitude greater radius. Spectral features from dust grains in the superheated layer appear in emission if the disk is viewed nearly face-on.
Chiang Eugene I.
Goldreich Peter
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