Multiwavelength Constraints on Dust Dynamics and Size Evolution in Protoplanetary Disk Rings. II. Observational Implications
9 affiliations
- 1Chinese Academy of Sciences
- 2University of Chinese Academy of Sciences
- 3Peking University
- 4National Astronomical Observatory of Japan
- 5National Sun Yat-Sen University
- 6National Taiwan Normal University
- 7Max-Planck Institute for Astronomy
- 8Universidad Nacional Autónoma de México
- 9University Grenoble Alpes
Abstract
Spatially resolved dust rings in protoplanetary disks are widely used to infer disk and dust physics from multiwavelength 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 centimeter per second 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 multiwavelength 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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BibTeX
@article{杨2026multiwavelength,
title = {{Multiwavelength Constraints on Dust Dynamics and Size Evolution in Protoplanetary Disk Rings. II. Observational Implications}},
author = {Linhan 林翰 Yang 杨 and Ya-Ping 亚平 Li 李 and Ruobing 若冰 Dong 董 and Yinhao 寅昊 Wu 吴 and Hauyu Baobab 浩宇 Liu 呂 and Kiyoaki 井聖明 Doi 土 and Anibal Sierra and Greta Guidi and Pinghui 平辉 Huang 黄},
journal = {The Astrophysical Journal},
year = {2026},
month = oct,
doi = {10.3847/1538-4357/aea83f},
url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea83f},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Multiwavelength Constraints on Dust Dynamics and Size Evolution in Protoplanetary Disk Rings. II. Observational Implications
AU - Linhan 林翰 Yang 杨
AU - Ya-Ping 亚平 Li 李
AU - Ruobing 若冰 Dong 董
AU - Yinhao 寅昊 Wu 吴
AU - Hauyu Baobab 浩宇 Liu 呂
AU - Kiyoaki 井聖明 Doi 土
AU - Anibal Sierra
AU - Greta Guidi
AU - Pinghui 平辉 Huang 黄
PY - 2026
DA - 2026/10/12
JO - The Astrophysical Journal
DO - 10.3847/1538-4357/aea83f
UR - https://iopscience.iop.org/article/10.3847/1538-4357/aea83f
AB - Spatially resolved dust rings in protoplanetary disks are widely used to infer disk and dust physics from multiwavelength 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 centimeter per second 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 multiwavelength 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.
SN - 0004-637X
SN - 1538-4357
ER -