SPYGLASS. IV. Young stars from Gaia DR3

Using a revised form of the SPYGLASS young star identification methodology, we produce an expanded census of nearby young stars (age<50Myr). We then use the HDBSCAN clustering algorithm to produce a new SPYGLASS Catalog of Young Associations, which reveals 116 young associations within 1kpc.

More than 25% of these groups are largely new discoveries, as 20 are substantively different from any previous definition, and 10 have no equivalent in the literature. The new associations reveal a yet undiscovered demographic of small associations with little connection to larger structures. Some of the groups we identify are especially unique for their high transverse velocities, which can differ from the solar velocity by 30-50km/s, and for their positions, which can reach up to 300 pc above the galactic plane.