Rediscovering the Tidal Tails of NGC 288 with Gaia DR2
  NGC 288 is a Galactic globular cluster having observed extra tidal structure,
without confirmed tidal tails. $Gaia$ DR2 provides photometric and astrometric
data for many of the stars in NGC 288 and its extra tidal structure. To compare
with $Gaia$ data, we simulate an $N$-body model of a star cluster with the same
orbit as NGC 288 in a Milky Way potential. The simulation shows that the
cluster forms tidal tails that are compressed along the cluster's orbit when it
is at apocentre and are expected to be a diffuse bipolar structure. In this
letter, we present a comparison between the simulation and observations from
$Gaia$ DR2. We find that both the simulation and the observations share
comparable trends in the position on the sky and proper motions of the
extra-tidal stars, supporting the presence of tidal tails around NGC 288.
