SPHERE-ZIMPOL polarimetric imaging observations of IK Tau. Left to right: each row shows the total intensity (first column), polarized intensity (second column), in units of W m−2 μm−1 arcsec−2 as described in Sect. 2.1, the degree of polarization superimposed with the polarization vector maps (third column), and the intensity of the PSF reference star HIP 20188 (last column), which are also presented in units of W m−2 μm−1 arcsec−2. Top to bottom: observed images at 645 nm (CntHa, continuum), 656.3 nm (NHa, Hα), 717 nm (TiO717, TiO band), 748 nm (Cnt748, continuum), as well as 820 nm (Cnt820, continuum, average combined image of cam1 and cam2). The position and angular diameter of the star are indicated by the circles in columns one to three, whereas the approximate extension of the low-polarization region (radius ~23 mas, column three) is shown in column two as a dashed circle. The colour scale of the intensity maps of IK Tau and HIP 20188 is cut off at 0.5% of the peak intensity. North is to the top and east to left in all panels.
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