Multiwavelength analysis of polarized light in HD 100453
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Date
2025-10
Publication Type
Journal Article
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yes
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Abstract
Context.
HD 100453 disk is a prototypical companion-disk interaction system hosting a pair of spirals and a substellar companion.
Aims.
We present new noncoronagraphic high-contrast imaging observations of HD 100453 with V filter on SPHERE/ZIMPOL. We aim to accurately measure the reflected polarized intensity, the disk intensity, and the degree of polarization at multiwavelength; characterize the dust properties in the disk ring and the companion-driven spiral arms; and search for the radial dependencies of dust scattering properties within the disk.
Methods.
We combined high-contrast imaging data of the reflected light from 0.55 to 2.2 μm using the V, I′, J, and Ks band data of ZIMPOL and IRDIS at VLT/SPHERE. For each observational epoch, we corrected for the smearing effect to derive the intrinsic disk-integrated polarized flux. We applied reference differential imaging to extract the disk intensity for the V and Ks bands using star hopping observations. We then used RADMC-3D radiative transfer modeling with a parametrized Henyey–Greenstein phase function to constrain the dust properties.
Results.
For the integrated intrinsic polarized flux of the disk, we derived a steady increase with wavelengths from Q̂φ/I★(V) = 0.3% to Q̂φ/I★(K) = 1.2%. We obtained the first V-band total intensity for HD 100453 with ZIMPOL star hopping. The integrated total flux Idisk/I★(V) = 1.5% increases to Idisk/I★(K) = 4.8%. Both the total intensity and the polarization fraction show red colors, and the intrinsic maximum degree of polarization increases moderately from 40% to 55%. From the V to Ks band, the dominating dust in the outer disk has an increasing scattering albedo and degree of polarization, while the asymmetry parameter slightly decreases. The outer disk of HD 100453 contains sub-micron-sized low porosity grains/aggregates. The cavity in scattered light is not empty and is replenished with optically thin dust with a maximum size of ≤ 0.1 μm. The linear polarization is higher in the spiral region than in the other regions, suggesting different dust properties in those regions.
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published
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Journal / series
Volume
702
Pages / Article No.
Publisher
EDP Sciences
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Date created
Subject
polarization; radiative transfer; scattering; protoplanetary disks; stars: pre-main sequence