Kavli Affiliate: Ruobing Dong
| First 5 Authors: Linhan Yang, Linhan Yang, , ,
| 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 (up to the fragmentation limit) are
nearly identical in the dust ring, as dust growth dominates over drift and
diffusion (e.g., with a typical dust-to-gas ratio of $epsilon sim 10^-2$).
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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