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While the most exciting explanation of the observed dust asymmetries inprotoplanetary disks is the presence of protoplanets, other mechanisms can alsoform the dust features. This paper presents dual-wavelength Atacama LargeMillimeter/submillimeter Array (ALMA) observations of a large asymmetric dustyring around the M-type star CIDA 9A. We detect a dust asymmetry in both 1.3 mmand 3.1 mm data. To characterize the asymmetric structure, a parametric modelis used to fit the observed visibilities. We report a tentative azimuthal shiftof the dust emission peaks between the observations at the two wavelengths.This shift is consistent with a dust trap caused by a vortex, which may beformed by an embedded protoplanet or other hydrodynamical instabilities, suchas a dead zone. Deep high-spatial observations of dust and molecular gas areneeded to constrain the mechanisms that formed the observed millimeter cavityand dust asymmetry in the protoplanetary disk around CIDA 9A.

Dual-Band Observations of the Asymmetric Ring around CIDA 9A: Dead or Alive?