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We present high-contrast images of HR 4796 A taken with Subaru/HiCIAO inH-band, resolving the debris disk in scattered light. The application ofspecialized angular differential imaging methods (ADI) allows us to trace theinner edge of the disk with high precision, and reveals a pair of "streamers"extending radially outwards from the ansae. Using a simple disk model with apower-law surface brightness profile, we demonstrate that the observedstreamers can be understood as part of the smoothly tapered outer boundary ofthe debris disk, which is most visible at the ansae. Our observations areconsistent with the expected result of a narrow planetesimal ring being groundup in a collisional cascade, yielding dust with a wide range of grain sizes.Radiation forces leave large grains in the ring and push smaller grains ontoelliptical, or even hyperbolic trajectories. We measure and characterize thedisk's surface brightness profile, and confirm the previously suspected offsetof the disk's center from the star's position along the ring's major axis.Furthermore, we present first evidence for an offset along the minor axis. Suchoffsets are commonly viewed as signposts for the presence of unseen planetswithin a disk's cavity. Our images also offer new constraints on the presenceof companions down to the planetary mass regime (~9 Jupiter masses at 0.5", ~3Jupiter masses at 1").

Images of the Extended Outer Regions of the Debris Ring Around HR 4796 A