Proper Motions of Stellar Streams Discovered in the Dark Energy Survey
  We cross-match high-precision astrometric data from Gaia DR2 with accurate
multi-band photometry from the Dark Energy Survey (DES) DR1 to confidently
measure proper motions for nine stellar streams in the DES footprint: Aliqa
Uma, ATLAS, Chenab, Elqui, Indus, Jhelum, Phoenix, Tucana III, and Turranburra.
We determine low-confidence proper motion measurements for four additional
stellar streams: Ravi, Wambelong, Willka Yaku, and Turbio. We find evidence for
a misalignment between stream tracks and the systemic proper motion of streams
that may suggest a systematic gravitational influence from the Large Magellanic
Cloud. These proper motions, when combined with radial velocity measurements,
will allow for detailed orbit modeling which can be used to constrain
properties of the LMC and its affect on nearby streams, as well as global
properties of the Milky Way's gravitational potential.
