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PreprintCC BY 4.0arXiv

Multi-wavelength Constraints on Dust Dynamics and Size Evolution in Protoplanetary Disk Rings. II. Observational Implications

  • Linhan Yang
  • Ya-Ping Li
  • Ruobing Dong
  • Yinhao Wu
  • Hauyu Baobab Liu
  • Kiyoaki Doi
  • Anibal Sierra
  • Greta Guidi
  • Pinghui Huang
Open at sourcePDFDOICite

Abstract

Spatially resolved dust rings in protoplanetary disks are widely used to infer disk and dust physics from multi-wavelength continuum observations. Their interpretation, however, often neglects grain growth and the evolution of the size distribution, limiting the connection between observed ring profiles and dust-evolution parameters. Building on a physical dust-ring model that includes coagulation and fragmentation, we develop a Bayesian inference framework that jointly incorporates radiative transfer and finite angular resolution. When applied to two rings in HD 163296 and two in LkCa 15, our framework yields gas-dependent estimates of the key dust-evolution parameters such as turbulence strength α and the fragmentation velocity vfrag in a self-consistent way. Most rings admit both a low-α, low-vfrag branch with small grains, and a higher-α, higher-vfrag branch with larger grains. Typical low-α branches have α∼10−5--10−4 and fragmentation velocities of order cm s−1 level, whereas the higher-α branches reach α∼10−3--10−2 and fragmentation velocities of a few to $20$ m s−1. The observed broad and wavelength-dependent profiles near the ring peaks can be reproduced by intrinsically narrow dust rings. This new framework offers a more direct route from multi-wavelength continuum data to the microphysics of dust growth and trapping---a connection that can be robustly tested with future high-resolution observations at longer wavelengths.

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Cite

BibTeXRIS
BibTeX
@misc{yang2026multiwavelength,
  title = {{Multi-wavelength Constraints on Dust Dynamics and Size Evolution in Protoplanetary Disk Rings. II. Observational Implications}},
  author = {Linhan Yang and Ya-Ping Li and Ruobing Dong and Yinhao Wu and Hauyu Baobab Liu and Kiyoaki Doi and Anibal Sierra and Greta Guidi and Pinghui Huang},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.16556},
  eprint = {2609.16556},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.16556},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Multi-wavelength Constraints on Dust Dynamics and Size Evolution in Protoplanetary Disk Rings. II. Observational Implications
AU  - Linhan Yang
AU  - Ya-Ping Li
AU  - Ruobing Dong
AU  - Yinhao Wu
AU  - Hauyu Baobab Liu
AU  - Kiyoaki Doi
AU  - Anibal Sierra
AU  - Greta Guidi
AU  - Pinghui Huang
PY  - 2026
DA  - 2026/09/15
PB  - arXiv
DO  - 10.48550/arxiv.2609.16556
UR  - https://arxiv.org/abs/2609.16556
AB  - Spatially resolved dust rings in protoplanetary disks are widely used to infer disk and dust physics from multi-wavelength continuum observations. Their interpretation, however, often neglects grain growth and the evolution of the size distribution, limiting the connection between observed ring profiles and dust-evolution parameters. Building on a physical dust-ring model that includes coagulation and fragmentation, we develop a Bayesian inference framework that jointly incorporates radiative transfer and finite angular resolution. When applied to two rings in HD 163296 and two in LkCa 15, our framework yields gas-dependent estimates of the key dust-evolution parameters such as turbulence strength α and the fragmentation velocity v_frag in a self-consistent way. Most rings admit both a low-α, low-v_frag branch with small grains, and a higher-α, higher-v_frag branch with larger grains. Typical low-α branches have α∼10^−5--10^−4 and fragmentation velocities of order cm s^−1 level, whereas the higher-α branches reach α∼10^−3--10^−2 and fragmentation velocities of a few to $20$ m s^−1. The observed broad and wavelength-dependent profiles near the ring peaks can be reproduced by intrinsically narrow dust rings. This new framework offers a more direct route from multi-wavelength continuum data to the microphysics of dust growth and trapping---a connection that can be robustly tested with future high-resolution observations at longer wavelengths.
ER  -