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We present 880 micron images of the transition disk around the star [PZ99]J160421.7-213028, a solar-mass star in the nearby Upper Scorpius association.With a resolution down to 0.34 arcsec, we resolve the inner hole in this disk,and via model fitting to the visibilities and spectral energy distribution wedetermine both the structure of the outer region and the presence of sparsedust within the cavity. The disk contains about 0.1 Jupiter masses ofmm-emitting grains, with an inner disk edge of about 70 AU. The inner cavitycontains a small amount of dust with a depleted surface density in a regionextending from about 20-70 AU. Taking into account prior observationsindicating little to no stellar accretion, the lack of a binary companion, andthe presence of dust near 0.1 AU, we determine that the most likely mechanismfor the formation of this inner hole is the presence of one or more giantplanets.

870 micron Imaging of a Transitional Disk in Upper Scorpius: Holdover from the Era of Giant Planet Formation?