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Studies of pre-transitional disks, with a gap region between the innerinfrared-emitting region and the outer disk, are important to improving ourunderstanding of disk evolution and planet formation. Previous infraredinterferometric observations have shown hints of a gap region in theprotoplanetary disk around the Herbig Ae star HD~144432. We study the dustdistribution around this star with two-dimensional radiative transfer modeling.We compare the model predictions obtained via the Monte-Carlo radiativetransfer code RADMC-3D with infrared interferometric observations and the{\SED} of HD~144432. The best-fit model that we found consists of an inneroptically thin component at $0.21\enDash0.32~\AU$ and an optically thick outerdisk at $1.4\enDash10~\AU$. We also found an alternative model in which theinner sub-AU region consists of an optically thin and an optically thickcomponent. Our modeling suggests an optically thin component exists in theinner sub-AU region, although an optically thick component may coexist in thesame region. Our modeling also suggests a gap-like discontinuity in the disk ofHD~144432.

Monte-Carlo radiative transfer simulation of the circumstellar disk of the Herbig Ae star HD 144432