Imaging Discovery of the Debris Disk Around HIP 79977
C. Thalmann (1), M. Janson (2), E. Buenzli (3), T. D. Brandt (2), J., P. Wisniewski (4), C. Dominik (1), J. Carson (5), M. W. McElwain (6), T., Currie (7), G. R. Knapp (2), A. Moro-Mart\'in (8), T. Usuda (9), L. Abe (10),, W. Brandner (11), S. Egner (9), M. Feldt (11)

TL;DR
This study presents the first resolved images of the debris disk around HIP 79977, characterizing its shape, dust properties, and scattering behavior using advanced imaging techniques and data analysis methods.
Contribution
It introduces a novel application of PCA-based ADI and PDI techniques for detailed debris disk imaging and modeling, providing new insights into disk structure and dust properties.
Findings
Disk inclination of approximately 84 degrees
High forward-scattering parameter g = 0.45
Tangential polarization increases from 10% to 45%
Abstract
We present Subaru/HiCIAO H-band high-contrast images of the debris disk around HIP 79977, whose pres- ence was recently inferred from an infrared excess. Our images resolve the disk for the first time, allowing characterization of its shape, size, and dust grain properties. We use angular differential imaging (ADI) to reveal the disk geometry in unpolarized light out to a radius of ~2", as well as polarized differential imaging (PDI) to measure the degree of scattering polarization out to ~1.5". In order to strike a favorable balance between suppression of the stellar halo and conservation of disk flux, we explore the application of principal component analysis (PCA) to both ADI and reference star subtraction. This allows accurate forward modeling of the effects of data reduction on simulated disk images, and thus direct comparison with the imaged disk. The resulting best-fit values and…
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