Panels a–c: grain size as function of the distance for all simulations run in the exocometary dust delivery at perihelion scenario (the yellow area, and the dotted and dash-dotted lines have the same meaning as in Fig. 2, while the dashed line corresponds to the limit between initially bound and unbound grains sizes). Panels d–f: specific case of an F0 star and carbon grains, for which the evolution of the grain size, the eccentricity, and the β value as a function of distance is displayed. In the case of eccentricity, the two curves overlap.