Polarimetric images of HD 34282 by VLT/SPHERE/IRDIS. In all panels, north is up, east is left, and the star center is annotated with a green cross. All images are shown on a linear color map. (a) The Q_ϕ image showsthe inner cavity, surrounded by the bright inner edge (or wall) of the outer disk as an ellipse with its center slightly offset from the star in the northeastern direction. Faint structures are detected directly outside this inner wall. (b) The U_ϕ image shownwith the same intensity range as panel a. (c) To highlight the outer disk structures we scaled the Q_ϕ image with the disk radius squared, corrected for the inclination (Piétu et al. 2003, 56°). To a first order, this r² scaling accounts for the decrease in stellar irradiation of the disk. The height of the scattering surface was not taken into account, thus this scaling is only shown for illustrative purpose so as to highlight the fainter structures outside the inner wall. (d) U_ϕ with the same r² scaling and shown for the same intensity range as panel c.