Surface brightness map of the total emitted thermal radiation at a wavelength of 1.3 mm (left) and 10 mm (right) overlaid with polarization vectors at these wavelengths. In the top row (a, b), the polarization arises from thermal emission and dichroic extinction of aligned dust grains only. At wavelengths of 1.3 mm and 10 mm, only 100 μm and 1 mm-sized grains are assumed to be aligned, respectively. In contrast, in the bottom row (c, d), the polarization arises from self-scattered radiation only. The disk is inclined by 45^∘. See Sects. 3.2 and 3.3 for details.