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Here we present deep (16 mumJy), very high (40 mas) angular resolution 1.14mm, polarimetric, Atacama Large Millimeter/submillimeter Array (ALMA)observations towards the massive protostar driving the HH 80-81 radio jet. Theobservations clearly resolve the disk oriented perpendicular to the radio jet,with a radius of ~0.171 arcsec (~291 au at 1.7 kpc distance). The continuumbrightness temperature, the intensity profile, and the polarization propertiesclearly indicate that the disk is optically thick for a radius of R<170 au. Thelinear polarization of the dust emission is detected almost all along the diskand its properties suggest that dust polarization is produced mainly byself-scattering. However, the polarization pattern presents a cleardifferentiation between the inner (optically thick) part of the disk and theouter (optically thin) region of the disk, with a sharp transition that occursat a radius of 0.1 arcsec (~170 au). The polarization characteristics of theinner disk suggest that dust settling has not occurred yet with a maximum dustgrain size between 50 and 500 mum. The outer part of the disk has a clearazimuthal pattern but with a significantly higher polarization fractioncompared to the inner disk. This pattern is broadly consistent withself-scattering of a radiation field that is beamed radially outward, asexpected in the optically thin outer region, although contribution fromnon-spherical grains aligned with respect to the radiative flux cannot beexcluded.

Resolving the polarized dust emission of the disk around the massive star powering the HH~80-81 radio jet