Fig. 1
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Left: contrast curves computed from the SPHERE H2 high contrast images. The rise in most contrast curves at around 1 arcsec (converted to physical scale) corresponds to the limit of the AO correction (0.8 arcsec; Fusco et al. 2006, 2016). The reached contrast in the H2 band and H3 band (not plotted here) is almost identical. Right: mass limits derived from the SPHERE H2 contrast curves in above using the AMES-Cond evolutionary models (Baraffe et al. 2003). The shaded regions show the possible spread due to the uncertainty on the stellar ages. We note that the mass limits obtained in the H2 filter are a factor ∼2 better than in the H3 filter.
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