Top panel: median image obtained using monochromatic PCA with 1 principal component for spectral channel on SPHERE-IFS image, showing the continuum emission. The bright source at about 0.3 arcsec south-east from the center, identified with B, is the M-star companion detected by Mesa et al. (2019), which appears elongated as a consequence of the differential imaging adopted. Solid and dashed lines refer to the median PA and aperture of the “elongated structure” as measured in Sect. 3.2, respectively. Bottom panel: same image as top panel, but only in channels containing helium I at 1.083 μm line. The white solid and dashed lines show the PA of the extended structure, as discussed in Sect. 3. The white circle shows the size of the coronagraph used.