Radial profile of the normal geometrical optical depth produced by different grain size bins for the planet “A” (top), “B” (middle), and without a planet (bottom). A radial bin width is Δr = 0.25   AU. Vertical dashed lines show periastron and apastron of the planet orbit. A size distribution with a slope of q = 3.0 and the dust mass of ℳ_dust ≈ 8.5 × 10^-8   ℳ_⊕ (case “A”), 9.9 × 10^-8   ℳ_⊕ (case “B”), and 5.6 × 10^-8   ℳ_⊕ (without a planet) were used for the vertical scaling of the curves.