Models for the sub-mm dust emission from the ring system at ALMA Band 7 as a function of mass of the central substellar object using models from Baraffe et al. (2008), together with the ALMA photometry of the point source and the upper limit at the location of the star J1407. Three different disk configurations are presented. Colours correspond to separations from the star J1407: yellow 5 au, orange 10 au, blue 16 au.