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We report the presence of scattered light from dust grains located in thegiant planet formation region of the circumbinary disk orbiting the ~20-Myr-oldclose (~0.045 AU separation) binary system V4046 Sgr AB based on observationswith the new Gemini Planet Imager (GPI) instrument. These GPI images probe towithin ~7 AU of the central binary with linear spatial resolution of ~3 AU, andare thereby capable of revealing dust disk structure within a regioncorresponding to the giant planets in our solar system. The GPI imaging revealsa relatively narrow (FWHM ~10 AU) ring of polarized near-infrared flux whosebrightness peaks at ~14 AU. This ~14 AU radius ring is surrounded by a fainterouter halo of scattered light extending to ~45 AU, which coincides withpreviously detected mm-wave thermal dust emission. The presence of small grainsthat efficiently scatter starlight well inside the mm-wavelength disk cavitysupports current models of planet formation that suggest planet-diskinteractions can generate pressure traps that impose strong radial variationsin the particle size distribution throughout the disk.

Scattered Light from Dust in the Cavity of the V4046 Sgr Transition Disk