  Studies of the structure and evolution of protoplanetary disks are important
for understanding star and planet formation. Here, we present the direct image
of an interacting binary protoplanetary system. Both circumprimary and
circumsecondary disks are resolved in the near-infrared. There is a bridge of
infrared emission connecting the two disks and a long spiral arm extending from
the circumprimary disk. Numerical simulations show that the bridge corresponds
to gas flow and a shock wave caused by the collision of gas rotating around the
primary and secondary stars. Fresh material streams along the spiral arm,
consistent with the theoretical scenarios where gas is replenished from a
circummultiple reservoir.
