Free Access

Fig. 4


HD 32297 Subaru/HICIAO polarized differential imaging (PDI) results in the H-band. a) Qφ and Uφ Stokes parameters obtained from the 2014 October 10 data in linear stretch and units of mJy/arcsec2. We recover the deviation from the midplane seen in the ADI data (see Fig. 1), but do not observe any gapped structure. The Uφ image has no clear structure apart from a very faint signal in the midplane of the disk, which is likely due to an imperfect polarimetric calibration. b) Corresponding S/N images in the linear [–5σ, 5σ] scale. The images have been convolved with a circular aperture of diameter ~FWHM. The signal in the Qφ S/N image (left panel) is not significant at small distances from the star. The noise map was obtained as the standard deviation of the Uφ image (right panel) in star-centred annuli. c) Linear polarization degree as a function of the projected distance from the star for both sides of the disk. The final polarization degree increases from ~10% at ~0.55 to ~25% at ~1.6, as at larger separations the scattering angles are constrained to ~90°, where the highest amount of polarization is produced.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.