Normalized polarized intensity map (left panel), Q_ϕ (middle panel), and U_ϕ (right panel)maps of J1608. Top panel: H-Band observations, obtained with a coronagraph as illustrated by the grey circle of diameter 0.185′′. The dashed line in the left panel traces the faint scattered light from the rear-facing near side of the disk (see Fig. A.1). Bottom panel: J-band observations, obtained without coronagraph. Each Q_ϕ and U_ϕ maps are normalized to the maximum of Q_ϕ.