We propose to use CHARIS and SCExAO to observe a sample of detached eclipsing binaries (DEBs), whose parameters are known with high precision and accuracy, that also show astrometric acceleration, in order to identify the low-mass companions that cause this acceleration. We focus on systems, whose predicted companion mass is in the brown dwarf (BD) regime, and whose age is older than 0.9 Gyr, i.e. older than a typical open cluster. By combining direct imaging observations with other data available for the hosts (radial velocities, distance, astrometry, chemical composition) we will be able to characterise their BD companions, incl. their dynamical mass, effective temperature, or luminosity, with a precision unique for such objects at an “old” age. These BDs could become benchmarks for evolutionary models of cool and ultracool dwarfs beyond 1 Gyr.
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