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We present 880 um Submillimeter Array observations of the debris disks aroundthe young solar analogue HD 107146 and the multiple-planet host star HR 8799,at an angular resolution of 3" and 6", respectively. We spatially resolve theinner edge of the disk around HR 8799 for the first time. While the data arenot sensitive enough (with rms noise of 1 mJy) to constrain the systemgeometry, we demonstrate that a model by Su et al. (2009) based on the spectralenergy distribution (SED) with an inner radius of 150 AU predicts well thespatially resolved data. Furthermore, by modeling simultaneously the SED andvisibilities, we demonstrate that the dust is distributed in a broad (of order100 AU) annulus rather than a narrow ring. We also model the observed SED andvisibilities for the HD 107146 debris disk and generate a model of the dustemission that extends in a broad band between 50 and 170 AU from the star. Weperform an a posteriori comparison with existing 1.3 mm CARMA observations anddemonstrate that a smooth, axisymmetric model reproduces well all of theavailable millimeter-wavelength data.

Resolved Submillimeter Observations of the HR 8799 and HD 107146 Debris Disks