Frequency dependent radiation transfer in protostellar disks
Cordula Sonnhalter, Thomas Preibisch & Harold W. Yorke
Astronomy and Astrophysics 299, 545, (1995)
The distribution of dust
temperatures and mean radiation intensities in axially symmetric dusty
disks are calculated
within the framework of the flux-limited diffusion approximation.
A multi-component dust model, consisting of amorphous carbon and
silicate grains which are coated with `dirty ice', is employed.
After determination of the dust temperatures a ray-tracing
procedure is used to calculate the spectral appearance of the disk
at varying inclinations and to produce isophote maps at selected
The spatial distribution of dust temperatures resulting from these
calculations reflect the shape of a disk's density distribution and
do not display a simple power law.
The spectra calculated from the same disk model at different
inclinations can vary over a wide range. It is therefore often not
possible to derive parameters of a disk - in particular its
evolutionary state - from the spectrum alone. It is not recommended to
infer the existence of planets by using simple temperature power law
fits to disk spectra in combination with simple power law dust
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