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Fig. 4

image

Physical structure of the best-fit model describing Sz 71. Left: gas surface density profile computed as 100 × Σd(R), where 100 is the gas-to-dust ratio. The solid red line is the cumulative mass (right y axis) and the black filled circle highlights the cut-off radius Rc ≃ 85 au. In all three plots, the dotted red line indicates the radius containing 95% of mass and the vertical dashed black line half the synthesized beam size (25 ) au. Middle: dust temperature profile Tmid(R) derived self-consistently at each radius from the disk model. The dot-dashed horizontal line represents the mass-averaged dust temperature Tmid, which for Sz 71 is 14 K. Right: optical depth of the disk midplane at the observing wavelength: the sub-mm continuum emission is expected to be optically thick only within R < 2 au.

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