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|Title:||Resolving the Polarized Dust Emission of the Disk around the Massive Star Powering the HH 80-81 Radio Jet||Authors:||Girart, J. M.
Li, Z. -Y.
Gómez, J. F.
de Gregorio-Monsalvo, I.
Rodríguez, L. F.
Torrelles, J. M.
|Issue Date:||2018||Journal:||THE ASTROPHYSICAL JOURNAL||Number:||856||Issue:||2||First Page:||L27||Abstract:||Here we present deep (16 μJy beam<SUP>-1</SUP>), very high (40 mas) angular resolution 1.14 mm, polarimetric, Atacama Large Millimeter/submillimeter Array (ALMA) observations toward the massive protostar driving the HH 80-81 radio jet. The observations clearly resolve the disk oriented perpendicularly to the radio jet, with a radius of ≃0.″171 (∼291 au at 1.7 kpc distance). The continuum brightness temperature, the intensity profile, and the polarization properties clearly indicate that the disk is optically thick for a radius of R ≲ 170 au. The linear polarization of the dust emission is detected almost all along the disk, and its properties suggest that dust polarization is produced mainly by self-scattering. However, the polarization pattern presents a clear differentiation between the inner (optically thick) part of the disk and the outer (optically thin) region of the disk, with a sharp transition that occurs at a radius of ∼0.″1 (∼170 au). The polarization characteristics of the inner disk suggest that dust settling has not occurred yet with a maximum dust grain size between 50 and 500 μm. The outer part of the disk has a clear azimuthal pattern but with a significantly higher polarization fraction compared to the inner disk. This pattern is broadly consistent with the self-scattering of a radiation field that is beamed radially outward, as expected in the optically thin outer region, although contribution from non-spherical grains aligned with respect to the radiative flux cannot be excluded.||URI:||http://hdl.handle.net/20.500.12386/27732||URL:||https://iopscience.iop.org/article/10.3847/2041-8213/aab76b||ISSN:||0004-637X||DOI:||10.3847/2041-8213/aab76b||Bibcode ADS:||2018ApJ...856L..27G||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Oct 26, 2020
checked on Oct 26, 2020
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