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ABSTRACT  We present results from a high angular resolution survey of 77 very low mass (VLM) binary systems with 6.0 ≤ V − K  colour ≤ 7.5 and proper motion ≥0.15 arcsec yr −1 . 21 VLM binaries were detected, 13 of them new discoveries. The new binary systems range in separation between 0.18 and 1.3 arcsec. The distance‐corrected binary fraction is  13.6 +6.5  −4   per cent, in agreement with previous results. Nine of the new binary systems have projected separations &gt;10 au, including a new wide VLM binary with 27 au projected orbital separation. One of the new systems forms two components of a 2300 au separation triple system. We find that the projected separation distribution of the binaries with  V − K  &lt; 6.5 in this survey appears to be different from that of redder (lower mass) objects, suggesting a possible rapid change in the orbital radius distribution at around the M5 spectral type. The target sample was also selected to investigate X‐ray activity among VLM binaries. There is no detectable correlation between excess X‐ray emission and the frequency and binary properties of the VLM systems.

The LuckyCam survey for very low mass binaries – II. 13 new M4.5–M6.0 binaries ★