Reproduction of the particle tracks shown in Fig. 7 of Rappaport et al. (2014) to validate the accuracy of our particledynamics code. Both panels show the tracks of non-sublimating particles in the corotating frame of the planet. Left panel: tracks of particles after one planetary orbit for radiation pressure force to gravitational force ratios, β, that vary from 0.05 to 0.35. Right panel: same as left but for 20 planetary orbits, with β = 0.01, 0.04 and 0.07. The cusps are the periastron passages of the dust particles. The orange circle represents the approximate size of the host star, Kepler-1520.