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We present deep HST/STIS coronagraphic images of the Beta Pic debris diskobtained at two epochs separated by 15 years. The new images and there-reduction of the 1997 data provide the most sensitive and detailed views ofthe disk at optical wavelengths as well as the yet smallest inner working angleoptical coronagraphic image of the disk. Our observations characterize thelarge-scale and inner-disk asymmetries and we identify multiple breaks in thedisk radial surface brightness profile. We study in detail the radial andvertical disk structure and show that the disk is warped. We explore the diskat the location of the Beta Pic b super-jupiter and find that the disk surfacebrightness slope is continuous between 0.5 and 2.0 arcsec, arguing for nochange at the separations where Beta Pic b orbits. The two epoch imagesconstrain the disk surface brightness evolution on orbital and radiationpressure blow-out timescales. We place an upper limit of 3% on the disk surfacebrightness change between 3-5 arcsec, including the locations of the disk warp,and the CO and dust clumps. We discuss the new observations in the context ofhigh-resolution multi-wavelength images and divide the disk asymmetries in twogroups: axisymmetric and non-axisymmetric. The axisymmetric structures (warp,large-scale butterfly, etc.) are consistent with disk structure models thatinclude interactions of a planetesimal belt and a non-coplanar giant planet.The non-axisymmetric features, however, require a different explanation.

The Inner Disk Structure, Disk-Planet Interactions, and Temporal Evolution in the Beta Pictoris System: A Two-Epoch HST/STIS Coronagraphic Study