Polarized intensity images of the HD 15115 debris disc in J band. Images show the Stokes Qφ parameter smoothed by a Gaussian kernel with σ = 2 pixels (panela) and with an additional 4 × 4 binning (panel b). The white arrow points to the local surface brightness peak responsible for the impression of the inner belt (see also Fig. 3). The star position is marked with a yellow asterisk. The colour scale shows the flux in counts per binned pixel. The surface brightness contours in panel b are given for 5 and 15 counts per binned pixel. The FOV of each displayed image is 8.2′′ × 3.1′′.
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