PI: Andrei Tokovinin, NOAO, email@example.com
Address: CTIO, Casilla 603 AURA, La Serena, Chile
Title: Low-mass close binaries paired to solar-type stars
Abstract: Statistics of hierarchical multiple systems with solar-type primaries in a large sample within 67 pc reveals new interesting trends. Some wide low-mass companions to these stars are themselves close binaries, and at least 10% of wide binaries are quadruple stars composed of two close pairs. This was established by the survey of 212 low-mass companions with a robotic AO system at Palomar conducted in 2012-13. Here we propose to extend the coverage of the RoboAO survey by examining the faintest (lowest-mass) stars with the SOAR AO system and by the quick radial-velocity monitoring of brighter companions to constrain the frequency of spectroscopic sub-systems. These data will confirm and strengthen the statistical trends established so far and will further elucidate the mechanisms of multiple-star formation.
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