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Azimuthally asymmetric dust distributions observed with ALMA in transitiondisks have been interpreted as dust traps. We present VLA Ka band (34 GHz or0.9 cm) and ALMA Cycle 2 Band 9 (680 GHz or 0.45 mm) observations at 0.2"resolution of the Oph IRS 48 disk, which suggest that larger particles could bemore azimuthally concentrated than smaller dust grains, assuming anaxisymmetric temperature field or optically thin 680 GHz emission. Fitting anintensity model to both data demonstrates that the azimuthal extent of themillimeter emission is 2.3 $\pm0.9$ times as wide as the centimeter emission,marginally consistent with the particle trapping mechanism under the aboveassumptions. The 34 GHz continuum image also reveals evidence for ionized gasemission from the star. Both the morphology and the spectral index variationsare consistent with an increase of large particles in the center of the trap,but uncertainties remain due to the continuum optical depth at 680 GHz.Particle trapping has been proposed in planet formation models to allow dustparticles to grow beyond millimeter sizes in the outer regions ofprotoplanetary disks. The new observations in the Oph IRS 48 disk providesupport for the dust trapping mechanism for centimeter-sized grains, althoughadditional data is required for definitive confirmation.

A concentration of centimeter-sized grains in the Oph IRS 48 dust trap