High resolution millimetre imaging of the CI Tau protoplanetary disc - a
  massive ensemble of protoplanets from 0.1 - 100 au
  We present high resolution millimeter continuum imaging of the disc
surrounding the young star CI Tau, a system hosting the first hot Jupiter
candidate in a protoplanetary disc system. The system has extended mm emission
on which are superposed three prominent annular gaps at radii ~ 13, 39 and 100
au. We argue that these gaps are most likely to be generated by massive planets
so that, including the hot Jupiter, the system contains four gas giant planets
at an age of only 2 Myr. Two of the new planets are similarly located to those
inferred in the famous HL Tau protoplanetary disc; in CI Tau, additional
observational data enables a more complete analysis of the system properties
than was possible for HL Tau. Our dust and gas dynamical modeling satisfies
every available observational constraint and points to the most massive
ensemble of exo-planets ever detected at this age, with its four planets
spanning a factor 1000 in orbital radius.Our results show that the association
between hot Jupiters and gas giants on wider orbits, observed in older stars,
is apparently in place at an early evolutionary stage.
