Top: evolution of the radial distance from the planet of a planetesimal captured in the prograde direction (panel a), and the retrograde direction (panel b), with an initial size R_pl = 100 km, as a function of time (normalized by the inverse of the orbital angular frequency of the planet Ω_K). Bottom: corresponding evolution of the mass of the planetesimal due to ablation in the case of prograde (panel c) and retrograde (panel d) capture. Ablation essentially occurs at closest approach from the planet due to the strong frictional heating in the dense inner parts of the CPD.