Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..233k&link_type=abstract
Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam
Physics
2
Scientific paper
We present infrared images and spectral energy distributions for models of disks around young stars surrounded by dusty halos. The halos we consider correspond to the reflection nebulae often associated with young stars. The radiative energy transport is faithfully treated in two space dimensions assuming axisymmetry, and the radiative equilibrium temperature in the disks and halos is determined simultaneously. We solve the angle- and frequency-dependent radiative transfer equation with scattering, and hence we obtain scattered light images and spectral energy distributions at the same time. The most important application of our model is that to the flat spectrum T Tauri stars, which show the anomalous mid- to far-infrared excesses. The halo can effectively heat the disk by scattering and reprocessing the stellar radiation toward the disk. The large mid- to far-infrared excess originates from the photosphere of the warmed disk, resulting in a flat spectrum as observed. Our calculations of model infrared images can naturally explain the recent HST observations which show the dark lanes seen against bright reflection nebulosity around young stars.
Kikuchi Naokichi
Nakamoto Taishi
Ogochi K.
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