Polarimetric differential imaging data of HIP 79977 with the VBB filter (590–880 nm). The original data were 3 × 3 binned to reduce the noise. The position of the star is marked by an asterisk in red. The upper panel shows Q_ϕ (left) and U_ϕ (right) images. Lower panel: isophotal contours of polarized light overlying Q_ϕ image. The contours were measured from the Q_ϕ image smoothed via a Gaussian kernel with σ = 1.5 px. Contour levels are given for 3 (blue line), 9 (light blue), 15 (orange) and 21 (red) counts per frame per binned pixel. The white dotted line shows the position of the expected ring axis. The region inside the white stellarcentric circle with radius ~ 0.12′′ is dominated by strong speckles variations. The color-bars show the counts per binned pixel.