A Detailed Characterization of HR 8799's Debris Disk with ALMA in Band 7

Abstract The exoplanetary system of HR 8799 is one the rare systems in which multiple planets have been directly imaged. Its architecture strikingly similar to that solar system, with four imaged giant surrounding a warm dust belt analogous Asteroid Belt, and themselves being surrounded by cold analog Kuiper Belt. Previous observations this ALMA Band 6 (1.3 mm) revealed its inner edge, but analyses data differ on precise location. It was therefore unclear whether or not outermost planet b dynamically sculpting it. We present here new debris disk 7 (340 GHz, 880 ? m). These are most detailed obtained so far, resolution 1? (40 au) sensitivity 9.8 Jy beam ?1 , allowed us recover structure high confidence. In order constrain morphology, we fit emission using radiative transfer models combined Markov Chain Monte Carlo procedure. find cannot be adequately represented single power law sharp edges. exhibits smoothly rising edge falling outer peak between, as expected from contains high-eccentricity component, hence confirming previous findings. Whether excited population shape stem presence an additional remains, however, open question.