标题： 用双子行星成像仪分析尘埃盘的统一方法 II：利用基于经验的散射相函数限制尘埃密度分布 显示英文标题

标题： A Uniform Analysis of Debris Disks with the Gemini Planet Imager II: Constraints on Dust Density Distribution Using Empirically-Informed Scattering Phase Functions

摘要： 需要空间分辨的尘埃盘图像来确定盘的形态属性以及散射相函数（SPF），后者量化了作为相角函数的散射光亮度。 目前的高对比度成像仪器已经成功地解析了其他恒星周围的几十个尘埃盘，但很少有研究以统一和一致的方式调查尘埃盘散射光解析种群的趋势。 我们结合了Karhunen-Loeve图像投影（KLIP）与辐射转移盘正向建模，以便用一致且统一应用的方法获得由Gemini行星成像仪在H波段观测到的八个尘埃盘的最高质量图像减少，并限制这些盘的形态属性。 在描述模型的散射特性时，我们假设一个从太阳系尘埃散射测量中得到的常见SPF，并将其应用于所有系统。 我们在样本中识别出多种尘埃密度特性，包括临界半径、径向宽度和垂直宽度。 我们还识别出可能由于次恒星伴星扰动而形成的径向狭窄且垂直延伸的盘，以及盘偏心率与相对盘宽度之间可能存在的一种初步的正相关趋势。 我们还发现，使用一个共同的SPF可以在轴对称和非轴对称的情况下合理地拟合模型，这表明来自尘埃盘的散射行为可能类似于太阳系尘埃。 显示英文摘要

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.