Kavli Affiliate: Ruobing Dong
| First 5 Authors: Miles Lucas, Miles Lucas, , ,
| Summary:
We present a dynamical analysis of the HD 169142 planet-forming disk based on
high-contrast polarimetric imaging over a twelve-year observational period,
offering insights into its disk evolution and planet-disk interactions. This
study explores the evolution of scattered-light features and their relationship
with millimeter continuum emission. Archival visible-to-near-infrared
scattered-light observations from NACO, SPHERE, and GPI combined with new
observations from SCExAO reveal persistent non-axisymmetric structures in both
the inner and outer rings of the disk. Through Keplerian image transformations
and phase cross-correlation techniques, we show that the azimuthal brightness
variations in the inner ring follow the local Keplerian velocity, suggesting
these are intrinsic disk features rather than planet-induced spirals or
shadows. The motion of the outer ring is weakly detected, requiring a longer
observational baseline for further confirmation. Comparing scattered-light
features with ALMA 1.3 mm-continuum data, we find that the scattered light
traces the edges of dust structures in the inner ring, indicating complex
interactions and a leaky dust trap around the water-ice snowline. These
findings highlight the capability of long-term monitoring of circumstellar
disks to distinguish planetary influences from Keplerian disk dynamics.
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