A Uniform Analysis of Debris Disks with the Gemini Planet Imager II: Constraints on Dust Density Distribution Using Empirically-Informed Scattering Phase Functions
arxiv(2024)
摘要
Spatially-resolved images of debris disks are necessary to determine disk
morphological properties and the scattering phase function (SPF) which
quantifies the brightness of scattered light as a function of phase angle.
Current high-contrast imaging instruments have successfully resolved several
dozens of debris disks around other stars, but few studies have investigated
trends in the scattered-light, resolved population of debris disks in a uniform
and consistent manner. We have combined Karhunen-Loeve Image Projection (KLIP)
with radiative-transfer disk forward modeling in order to obtain the highest
quality image reductions and constrain disk morphological properties of eight
debris disks imaged by the Gemini Planet Imager at H-band with a consistent and
uniformly-applied approach. In describing the scattering properties of our
models, we assume a common SPF informed from solar system dust scattering
measurements and apply it to all systems. We identify a diverse range of dust
density properties among the sample, including critical radius, radial width,
and vertical width. We also identify radially narrow and vertically extended
disks that may have resulted from substellar companion perturbations, along
with a tentative positive trend in disk eccentricity with relative disk width.
We also find that using a common SPF can achieve reasonable model fits for
disks that are axisymmetric and asymmetric when fitting models to each side of
the disk independently, suggesting that scattering behavior from debris disks
may be similar to Solar System dust.
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