Examples for the two ways to produce a smooth differential phase signal: (1) a chromatic photocentre shift (blue) and (2) a purely spatial asymmetry of the brightness distribution (red). In case 1, the source is shifted to the bottom between λ ~ 10 μm and 12 μm; in case 2, the “binary” has a brightness ratio of 0.7:1.0. The resulting visibilities and phases are shown in the left panels, with the absolute Fourier phases φabs and the differential phases φdiff (as would be measured with MIDI) plotted by dotted and continuous lines, respectively. In the right panels, the two brightness distributions are shown as false-colour images, with the brightness distribution at 13.0 μm, 11.0 μm and 8.0 μm mapped to the red, green and blue channels, respectively.
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