Trajectories (left) and the relative velocity of pebbles to the planet (right) with St = 10⁻⁴. Panel a: results obtained from UP-m003- hw01 case. Panel b: results obtained from PI-Stokes-m003-hw01 case. We set z_s = 0 [H]. Different colors correspond to different x_s as indicated in figure legends. The dots on the solid lines mark intervals of Ω⁻¹. The black dot and the dotted-dashed circle in the left column show the position of the planet and the Bondi radius of the planet. The vertical solid and dashed lines in the right column show the size of the Bondi radius and the terminal velocity of pebbles (Eq. (23)).