Compact dust disk in the Red Rectangle. Top: ALMA 0.9 mm continuum map of the Red Rectangle. Contours are −1 and 1, 2, 3, ...mJy beam⁻¹; 1 mJy beam⁻¹ is equivalent to 36.05 K in units of Rayleigh–Jeans equivalent brightness temperature. The clean-beam size at half maximum is (20×20 mas) is shown in the inset. Bottom: predicted continuum brightness distribution from our modeling (Sect. 3), all units and scales are the same as for the empirical map.