The complex morphology of the young disk MWC 758: spirals and dust clumps around a large cavity
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We present Atacama Large Millimeter Array observations at an angular resolution of 0 ''.1-0 ''.2 of the disk surrounding the young Herbig Ae star MWC. 758. The data consist of images of the dust continuum emission recorded at 0.88 millimeter, as well as images of the (CO)-C-13 and (CO)-O-18 J. =. 3-2 emission lines. The dust continuum emission is characterized by a large cavity of roughly 40 au in radius which might contain a mildly inner warped disk. The outer disk features two bright emission clumps at radii of similar to 47 and 82 au that present azimuthal extensions and form a double-ring structure. The comparison with radiative transfer models indicates that these two maxima of emission correspond to local increases in the dust surface density of about a factor 2.5 and 6.5 for the south and north clumps, respectively. The optically thick (CO)-C-13 peak emission, which traces the temperature, and the dust continuum emission, which probes the disk midplane, additionally reveal two spirals previously detected in near-IR at the disk surface. The spirals seen in the dust continuum emission present, however, a slight shift of a few au toward larger radii and one of the spirals crosses the south dust clump. Finally, we present different scenarios to explain the complex structure of the disk.
NASA Origins of Solar Systems program NNX15AB06G NSF AST-1535809 NRAO AST-0836064 National Aeronautics and Space Administration 15XRP15 20140 Ministry of Science and Technology (MoST) in Taiwan MoST 103-2119-M-001-010-MY2
Artículo de publicación ISI
Quote ItemAstrophysical Journal 853:162 (13pp), 2018 February 1
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