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We explore the origin of the flat spectrum seen in some T Tauri stars byconsidering a three-component structure: a central star, a circumstellar disk,and a dusty halo. The radiative energy transport is faithfully treated bysolving the angle- and frequency-dependent radiative transfer equation in twospace dimensions assuming axisymmetry, and hence the radiative equilibriumtemperature in the disk and halo is determined simultaneously. The disk iseffectively heated by the scattering and reprocessing of stellar radiationthrough the halo. The large mid- to far-infrared excess originates from thephotosphere of the warmed disk, resulting in a flat spectrum, as observed. Thehalo which we consider is observed as a compact reflection nebula, and isdiscriminated from extended, disk-like envelopes around flat-spectrum T Tauristars. We show that the overall spectral shape of flat-spectrum T Tauri starscan be reproduced by the present disk-halo model.Comment: 10 pages including 9 figure

Disk–Halo Model for Flat-Spectrum T Tauri Stars