Validation tests. Left: time evolution of the size, s, of different aggregates as they are eroded. The vertical turnover in the profile gives the characteristic erosion time. The aggregates are kept at a fixed distance of 1 au from the star, and the ejected dust has a size of 100 µm. Dashed lines represent data from R20, which are in excellent agreement with our results. Right: Stokes number at the erosion threshold for aggregates drifting towards the star and four different sizes of ejected grains. Dotted lines represent the analytical solution presented in G20.