Fig. 12
Toomre parameter calculated from the ALMA band 7 (0.85 mm) dust continuum (Pinilla et al. 2015) with a typical gas-to-dust ratio of g/d = 100, g/d = 80 (van der Marel et al. 2016), and g/d = 4 (Carmona et al. 2014). The dashed lines show the 25 au scattered light cavity, the 46 au millimeter cavity from Andrews et al. (2011), and the outer radius at which the spiral arms are visible.
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