标题： Gemini行星成像仪对HD 156623周围一个低倾角的碎片盘的观测 显示英文标题

标题： Gemini Planet Imager Observations of a Resolved Low-Inclination Debris Disk Around HD 156623

摘要： 16百万年的A0V恒星HD 156623位于天蝎座-半人马座协会，拥有一个高光度碎片盘，最近首次由Gemini行星成像仪（GPI）在偏振强度中解析出来。 我们对GPI H波段偏极化检测的HD 156623碎片盘进行了新的分析，特别关注其独特的形态。 这个碎片盘缺乏可见的内部清空区域，不同于GPI样本和Sco-Cen中大多数低倾角盘，并且已知包含CO气体，使其成为候选的“混合”或“屏蔽”盘。 我们使用辐射转移模型根据散射光数据限制盘的几何参数，并使用热模型根据系统的光谱能量分布（SED）限制未解析的内部半径。 我们还计算了偏振散射相函数的测量值，增加了现有的经验相函数测量样本。 我们发现HD 156623的碎片盘内部半径在99.7%置信区间内，从散射光图像中限制为小于26.6 AU，从SED建模中限制为小于13.4 AU，并建议气体阻力可能在保留如此靠近恒星的亚爆裂尺寸尘埃颗粒中起作用。 显示英文摘要

摘要： The 16 Myr-old A0V star HD 156623 in the Scorpius--Centaurus association hosts a high-fractional-luminosity debris disk, recently resolved in scattered light for the first time by the Gemini Planet Imager (GPI) in polarized intensity. We present new analysis of the GPI H-band polarimetric detection of the HD 156623 debris disk, with particular interest in its unique morphology. This debris disk lacks a visible inner clearing, unlike the majority of low-inclination disks in the GPI sample and in Sco-Cen, and it is known to contain CO gas, positioning it as a candidate ``hybrid'' or ``shielded'' disk. We use radiative transfer models to constrain the geometric parameters of the disk based on scattered light data and thermal models to constrain the unresolved inner radius based on the system's spectral energy distribution (SED). We also compute a measurement of the polarized scattering phase function, adding to the existing sample of empirical phase function measurements. We find that HD 156623's debris disk inner radius is constrained to less than 26.6 AU from scattered light imagery and less than 13.4 AU from SED modeling at a 99.7% confidence interval, and suggest that gas drag may play a role in retaining sub-blowout size dust grains so close to the star.