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HD~106906AB is so far the only young binary system around which a planet hasbeen imaged and a debris disk evidenced thanks to a strong IR excess. As such,it represents a unique opportunity to study the dynamics of young planetarysystems. We aim at further investigating the close (tens of au scales)environment of the HD~106906AB system. We used the extreme AO fed, highcontrast imager SPHERE recently installed on the VLT to observe HD~106906. Boththe IRDIS imager and the Integral Field Spectrometer were used. We discovered avery inclined, ring-like disk at a distance of 65~au from the star. The diskshows a strong brightness asymmetry with respect to its semi-major axis. Itshows a smooth outer edge, compatible with ejection of small grains by thestellar radiation pressure. We show furthermore that the planet's projectedposition is significantly above the disk's PA. Given the determined diskinclination, it is not excluded though that the planet could still orbit withinthe disk plane if at a large separation (2000--3000 au). We identified severaladditional point sources in the SPHERE/IRDIS field-of-view, that appear to bebackground objects. We compare this system with other debris disks sharingsimilarities, and we briefly discuss the present results in the framework ofdynamical evolution.

A narrow, edge-on disk resolved around HD 106906 with SPHERE