Polarized intensity image of CS Cha and its companion in the J band, after instrumental polarization correction. The circumbinary disk and the companion are well detected in polarized light. We overlayed the angle of the linear polarized light with light blue bars. The companion deviates by ~20° from an azimuthal polarization w.r.t. CS Cha indicating that it is intrinsically polarized and does not just scatter stellar light.
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