JWST-TST高对比度：利用NIRCam和MIRI观测$β$ Pictoris星盘中的不对称性、尘埃种群及碰撞迹象
JWST-TST High Contrast: Asymmetries, dust populations and hints of a collision in the $β$ Pictoris disk with NIRCam and MIRI
AI总结：
本文利用JWST MIRI和NIRCam首次观测Beta Pictoris碎屑盘，发现延展次级星盘及“猫尾”特征，并提出由多孔有机耐熔尘埃组成的间歇产尘模型解释其形态与辐射特性。
摘要：
我们展示了JWST MIRI和NIRCam对Beta Pictoris周围显著碎屑盘的首次观测结果。跨越1.8至23~$μ$m的8个滤波器的日冕仪观测提供了这些波长下前所未有的清晰星盘视图。该观测计划的目标是研究尘埃的成分和分布，并探测系统中是否存在行星。在本文中，我们重点关注星盘组成部分，提供了所有图像的表面亮度测量，并对观测到的不对称性进行了详细研究。Kammerer等人撰写的配套论文将利用相同数据重点关注该系统中的行星。我们首次报告了在热辐射中存在一个延展的次级星盘，其具有一个偏离星盘平面的弯曲延伸部分。我们将这一特征称为“猫尾”，它似乎与此前报告的CO团块、在西南侧探测到的中红外不对称性，以及在散射光中观测到的扭曲现象相关联。我们提出了一个关于该次级星盘的模型，该星盘间歇性地产生尘埃，大致再现了猫尾的形态、通量和颜色，以及星盘中观测到的其他特征，并表明次级星盘主要由多孔的有机耐熔尘埃颗粒组成。
英文摘要：
We present the first JWST MIRI and NIRCam observations of the prominent debris disk around Beta Pictoris. Coronagraphic observations in 8 filters spanning from 1.8 to 23~$μ$m provide an unprecedentedly clear view of the disk at these wavelengths. The objectives of the observing program were to investigate the dust composition and distribution, and to investigate the presence of planets in the system. In this paper, we focus on the disk components, providing surface brightness measurements for all images and a detailed investigation of the asymmetries observed. A companion paper by Kammerer et al. will focus on the planets in this system using the same data. We report for the first time the presence of an extended secondary disk in thermal emission, with a curved extension bent away from the plane of the disk. This feature, which we refer to as the ``cat's tail", seems to be connected with the previously reported CO clump, mid-infrared asymmetry detected in the southwest side, and the warp observed in scattered light. We present a model of this secondary disk sporadically producing dust that broadly reproduces the morphology, flux, and color of the cat's tail, as well as other features observed in the disk, and suggests the secondary disk is composed largely of porous, organic refractory dust grains.
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