双子座行星成像仪对AU Microscopii碎片盘的观测：一角秒内的不对称性
Gemini Planet Imager Observations of the AU Microscopii Debris Disk: Asymmetries within One Arcsecond
摘要：
我们提出双子座行星成像仪（GPI）的天文台Microscopii，一个年轻的M矮星的边缘，尘埃碎片盘的意见。在GPI调试期间获得了积分场光谱和宽带成像偏振测量。在我们的宽带成像偏振观测中，我们只在总强度中检测到盘，并发现东南和西北侧之间盘的形态不对称。星盘的东南侧在1 $''$（10 AU投影间距）处显示出一个隆起，其垂直延伸程度是西北侧的三倍，峰值表面亮度比西北侧的三倍更暗。这部分的磁盘也是垂直偏移69 $\pm$ 30 mas的东北方向1 $''$相比，建立磁盘中平面和一致的ALMA和哈勃太空望远镜/STIS观测。我们看到暗示，东南隆起可能是检测到主磁盘上方的水平长条特征的结果，该特征可能是磁盘背面。或者，当包括西北侧的形态时，其中盘中平面在0 $.''$ 4和1 $.''$ 2之间在相反方向上偏移$\sim$ 50 mas，不对称性表明翘曲状特征。使用我们的积分场光谱数据来搜索行星，我们在4 AU处完成了$\sim$ 4 $M_\mathrm{Jup}$行星的50%。我们检测到一个源，解决只沿磁盘平面，这可能是一个候选人的行星质量的同伴或在磁盘中的一个紧凑的团块。
英文摘要：
We present Gemini Planet Imager (GPI) observations of AU Microscopii, a young M dwarf with an edge-on, dusty debris disk. Integral field spectroscopy and broadband imaging polarimetry were obtained during the commissioning of GPI. In our broadband imaging polarimetry observations, we detect the disk only in total intensity and find asymmetries in the morphology of the disk between the southeast and northwest sides. The southeast side of the disk exhibits a bump at 1$''$ (10 AU projected separation) that is three times more vertically extended and three times fainter in peak surface brightness than the northwest side at similar separations. This part of the disk is also vertically offset by 69$\pm$30 mas to the northeast at 1$''$ when compared to the established disk mid-plane and consistent with prior ALMA and Hubble Space Telescope/STIS observations. We see hints that the southeast bump might be a result of detecting a horizontal sliver feature above the main disk that could be the disk backside. Alternatively when including the morphology of the northwest side, where the disk mid-plane is offset in the opposite direction $\sim$50 mas between 0$.''$4 and 1$.''$2, the asymmetries suggest a warp-like feature. Using our integral field spectroscopy data to search for planets, we are 50% complete for $\sim$4 $M_\mathrm{Jup}$ planets at 4 AU. We detect a source, resolved only along the disk plane, that could either be a candidate planetary mass companion or a compact clump in the disk.
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