Kavli Affiliate: Ruobing Dong
| First 5 Authors: Linhan Yang, Ya-Ping Li, Ruobing Dong, Kiyoaki Doi, Hauyu Baobab Liu
| Summary:
Observations with the Atacama Large Millimeter/submillimeter Array (ALMA) and
the Jansky Very Large Array (JVLA) have revealed many dust rings in
protoplanetary disks, often interpreted as dust traps at gas pressure bumps.
Previous studies have typically modeled these rings by assuming a single dust
species in drift-diffusion equilibrium, neglecting dust size evolution
resulting from coagulation and fragmentation. In this work, we perform
numerical simulations that incorporate both dust-gas dynamics (drift and
diffusion) and dust size evolution. Our results show that the radial
distributions of different dust species are nearly identical, as dust growth
dominates over drift and diffusion. Building on this finding, we develop a
comprehensive, self-consistent analytical theory that describes the dust ring
structure while explicitly accounting for size evolution effects. Our model
provides a unified framework for interpreting multi-wavelength observations by
linking the physical dust distribution to the observed ring properties, thus
laying the foundation for future observational modeling.
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