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We present ground-based observations of the disk around the A-type star$\beta$ Pictoris to perform a close inspection of the inner disk morphology.Images were collected with NACO, the AO-assisted near-IR instrument on the VLT(ESO) which includes two types of coronagraphs: classical Lyot masks and phasemasks. In this program we took advantage of both types of coronagraphs in twospectral bands, H-band for the Lyot mask and Ks-band for the phase mask. Inaddition, we simulated an extended object to understand the limitations indeconvolution of coronagraphic images. The reduced coronagraphic images allowus to carefully measure the structures of the debris disk and reveal a numberof asymmetries of which some were not reported before (position, elevation andthickness of the warp). In this program, the circumstellar material is visibleas close as 0.7" ($13.5 $AU) owing to the phase mask while the Lyot maskgenerates artifacts which hamper the detection of the dust at separationscloser than 1.2" ($23.2 $AU). The point source detection limit is compared torecently published observations of a planet candidate. Finally, the simulationsshow that deconvolution of coronagraphic data may indeed produce artificialpatterns within the image of a disk.

VLT/NACO coronagraphic observations of fine structures in the disk of beta Pictoris