J/A+A/702/A78 HD 100453 polarised and total intensity images (Ma+, 2025)
Multiwavelength analysis of polarized light in HD 100453.
Ma J., Tazaki R., Schmid H.M., Duchene G., Dominik C., Ginski C., Menard F.
<Astron. Astrophys. 702, A78 (2025)>
=2025A&A...702A..78M 2025A&A...702A..78M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, emission ; Polarization ; Optical ; Infrared
Keywords: polarization - radiative transfer - scattering -
protoplanetary disks - stars: pre-main sequence
Abstract:
HD 100453 disk is a prototypical companion-disk interaction system
hosting a pair of spirals and a substellar companion.
We present new non-coronagraphic 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 multi-wavelength,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.
We combine high-contrast imaging data of the reflected light from 0.55
to 2.2 um using the V, I', J and K s 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 V and Ks-band using star-hopping observations. We then
used RADMC-3D radiative transfer modeling with a parametrized
Henyey-Greenstein phase function to constrain the dust properties
We derive for the integrated intrinsic polarised flux of the disk a
steady increase with wavelengths from {hat}Q{phi/I*(V)=0.3% to
{hat}Qφ/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 total
intensity and the polarization fraction show red colors, and the
intrinsic maximum degree of polarization increases moderately from 40%
to 55%. From V to Ks band, the dominating dust in the outer disk has
increasing scattering albedo and degree of polarization while the
asymmetry parameter slightly decreases. The HD 100453 outer disk
contains sub-micron-sized, low porosity grains/aggregates. The cavity
in scattered light is not empty and is replenished with optically thin
dust with maximum size <0.1um. The linear polarization is higher in
the spiral region than in the other regions, suggesting different dust
properties in those regions.
Description:
Broad-band V and IPRIM filters, and the SPHERE/IRDIS images were
taken with J and Ks filters, respectively.
The images show the averaged Qφ for all four wavelengths as in
Figure 1. The extracted disk intensity maps are available at V and K
bands as in Figure 3. All the images are cut to 2x2arcsec2.
The pixel sizes are different for ZIMPOL and IRDIS instruments.
Objects:
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RA (2000) DE Designation(s)
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11 33 05.57 -54 19 28.5 HD 100453 = HIP 56354
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 125 8 List of fits images
fits/* . 8 Individual fits images
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See also:
J/A+A/624/A33 : HD 100453 AB system ALMA images (van der Plas+, 2019)
J/A+A/675/L1 : HD 100453 disk K1-band image (Xie+, 2023)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension of center (J2000)
4- 5 I2 min RAm Right Ascension of center (J2000)
7- 11 F5.2 s RAs Right Ascension of center (J2000)
12 A1 --- DE- Declination sign of center (J2000)
13- 14 I2 deg DEd Declination of center (J2000)
16- 17 I2 arcmin DEm Declination of center (J2000)
19- 23 F5.2 arcsec DEs Declination of center (J2000)
25- 27 I3 --- Nx Number of pixels along X-axis
29- 31 I3 --- Ny Number of pixels along Y-axis
33- 36 I4 Kibyte size Size of FITS file
38- 63 A26 --- FileName Name of FITS file, in subdirectory fits
65-125 A61 --- Title Title of the FITS file
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Acknowledgements:
Jie Ma, jie.ma(at)univ-grenoble-alpes.fr
(End) Patricia Vannier [CDS] 19-Aug-2025