Scratching the surface with TGAS and RAVE: disk moving groups in the
  Solar neighborhood
  There is long tradition extending more than a century on the identification
of moving groups in the Solar neighborhood. However, with the advent of large
kinematic surveys, and especially of the upcoming Gaia data releases there is a
need for more sophisticated and automated substructure finders. We analyze the
TGASxRAVE dataset to identify moving groups in the Galactic disk. These groups
of stars may then be used to map dynamical and star formation processes in the
vicinity of the Sun. We use the ROCKSTAR algorithm, a "friends-of-friends"-like
substructure finder in 6D phase-space, and analyze the Hertzsprung-Russell
diagrams of the groups identified. We find 125 moving groups within 300 pc of
the Sun, containing on average 50 stars, and with 3D velocity dispersions
smaller than 10 km/s. Most of these groups were previously unknown. Our
photometric analysis allows us to isolate a subsample of 30 statistically
significant groups likely composed of stars that were born together.
