Top: coronagraphic L′-band images of HD 72660 and HD 92536, both with the newly detected low-mass stellar companions. Primary star positions are marked by asterisks. Bottom: proper motion analysis of the respective companion candidates. Blue and green data points with error bars show the relative positions of the companions at the two respective epochs. Black points indicate the position the companions would have had at the time of the respective second epoch if they were distant background stars with no proper motion, using the first epoch position as starting point and considering the Gaia DR2 proper motion and parallax of the primaries, including their uncertainties (which are however too small to be noticeable).
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