Spiral-shaped shadows on a flat, face-on disk from light travel time effects. The conical projected shadow (dashed lines) becomes a spiral when finite photon travel times are considered (solid black lines). Spirals from Eq. (1) are plotted for a 1.5 M⊙ star and a range of shadow origin radii, rrim = 0.05 , 0.10, 0.25, 0.50, and 1.00 au.
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