HD 100453 polarised and total intensity images

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}Q_{phi}_/I*(K)=1.2%. We obtained the first V-band total intensity for HD 100453 with ZIMPOL star-hopping. The integrated total flux I_disk_/I*(V)=1.5% increases to I_disk_/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.