Two substructures in the nearby stellar halo found in Gaia and RAVE
  We use the second Gaia data release (Gaia DR2), combined with RAVE
spectroscopic surveys, to identify the substructures in the nearby stellar
halo. We select 3,845 halo stars kinematically and chemically, and determine
their density distribution in energy and angular momentum space. To select the
substructures from overdensities, we reshuffle the velocities and estimate
their significance. Two statistically significant substructures, GR-1 and GR-2,
are identified. GR-1 has a high binding energy and small $z$-angular momentum.
GR-2 is metal-rich but retrograde. They are both new substructure, and may be
accretion debris of dwarf galaxies.
