Coronagraphic images of ET Cha taken with SPHERE/IRDIS in our program. Upper left: stacked total intensity image. Upper right: total intensity image after classical angular differential imaging reduction. Bottom: Stokes Q and U polarized flux images after polarization differential imaging. The size of the coronagraphic mask is indicated with the grey, hashed circle. The positive-negative signal pattern is caused by unresolved stellar polarization of the primary star, the companion or both and not by a resolved circumstellar disk.