On the crystallinity of silicate dust in evolving protoplanetary disks due to magnetically driven disk winds

TL;DR

This paper proposes a new mechanism where outward radial drift of pebbles transports crystalline silicate dust in protoplanetary disks, potentially explaining observed dust ring structures and high crystallinity levels.

Contribution

It introduces a novel outward transport process via pebble radial drift driven by magnetically induced disk winds, enhancing understanding of dust crystallinity distribution.

Findings

Crystalline dust can be transported outward efficiently by radial drift.

Crystallinity inside dust rings can reach up to 100%.

The process depends on the radial drift timescale being shorter than advection timescale.

Abstract

We present a novel mechanism for the outward transport of crystalline dust particles: the outward radial drift of pebbles. The dust ring structure is frequently observed in protoplanetary disks. One of the plausible mechanisms of the formation of dust rings is the accumulation of pebbles around the pressure maximum, which is formed by the mass loss due to magnetically driven disk winds. In evolving protoplanetary disks due to magnetically driven disk winds, dust particles can migrate outwardly from the crystallization front to the pressure maximum by radial drift. We found that the outward radial drift process can transport crystalline dust particles efficiently when the radial drift timescale is shorter than the advection timescale. Our model predicts that the crystallinity of silicate dust particles could be as high as 100% inside the dust ring position.