The CASTOFFS Survey: Pursuit of Young M Dwarfs Adrift in the Solar Neighborhood

The census of young, M dwarfs in the solar neighborhood is incomplete. Many constituents of the known sample are members of nearby, young moving groups (NYMGs), loose associations of coeval stars with common Galactic kinematics. Thus, new candidates of the under-sampled low-mass star population can be found via their possible association with NYMGs. We have therefore launched the Cool Astrometrically Selected Targets Optimal For Follow-up Spectroscopy (CASTOFFS) survey to identify and characterize previously unrecognized young, low-mass stars. We combine astrometry, photometry, and activity to find candidates and use dedicated spectroscopic follow-up to verify their youth. We are now 1.5 years into CASTOFFS and present early results to highlight new discoveries and provide a taste of what's to come. These results include two low-mass multiple systems: the first, a young hierarchical triple where the primary hosts a candidate debris disk, the other, a 1 AU separation, ∼100 Myr old, late-M binary. We also briefly introduce likely new members of NYMGs that represent key targets for further follow-up.