Trajectories after one planetary orbit of non-sublimating particles of corundum of radius 1 μ m with β = 0.038 after being ejected in different directions from the surface of a planet of radius 0.020 R_⊕ and mass 8.4 × 10⁻⁶ M_⊕. The particles were ejected with a velocity of 1.2 times thesurface escape velocity (272 m s⁻¹) towards the star at the top of the page (+y), in the anti-stellar direction towards the bottom of the page (−y), in the direction of the planet’s orbital motion to the right of the page (+x), in the anti-orbital motion direction to the left of the page (−x) and perpendicular to the orbital plane, out of the page (+z). This coordinate system is rotating around the z axis so the track for −z is the same as for +z. The planet is indicated by the circle (not to scale).