A Dust-Trapping Ring in the Planet-Hosting Disk of Elias 2-24

Rings and gaps are among the most widely observed forms of substructure in protoplanetary disks. A gap-ring pair may be formed when a planet carves a gap in the disk, which produces a local pressure maximum following the gap that traps inwardly drifting dust grains and appears as a bright ring due to the enhanced dust density. A dust-trapping ring would provide a promising environment for solid growth and possibly planetesimal production via the streaming instability. We present evidence of dust trapping in the bright ring of the planet-hosting disk Elias 2-24, from the analysis of 1. 3 mm and 3 mm ALMA observations at high spatial resolution (0. 029 arcsec, 4. 0 au). We leverage the high spatial resolution to demonstrate that larger grains are more efficiently trapped and place constraints on the local turbulence (8 10^-4 < ₜurb < 0. 03) and the gas-to-dust ratio (g / d < 30) in the ring. Using a scattering-included marginal probability analysis we measure a total dust disk mass of Mdust = 13. 8^+0. 7-₀. ₅ 10^-4 \ M_. We also show that at the orbital radius of the proposed perturber, the gap is cleared of material down to a flux contrast of 10^-3 of the peak flux in the disk.