拥有年轻行星的岩屑盘 AU Microscopii 的 JWST/NIRCam 日冕观测
JWST/NIRCam Coronagraphy of the Young Planet-hosting Debris Disk AU Microscopii
AI总结：
使用JWST/NIRCam对AU Mic系统进行3-5 μm日冕观测，首次获得该波长下的岩屑盘图像，未发现伴星候选体，但对宽轨道巨行星施加了最深度的直接成像约束。
摘要：
对岩屑盘系统的高对比度成像使我们能够评估星周尘埃的成分和尺寸分布，探测近期的动力学历史，并直接探测和表征嵌入的系外行星。在 2--3 $μ$m 之外的红外波段对这些系统进行观测，有望获得极其有利的行星对比度以及众多散射光光谱特征——但通常受到这些波长下天空亮度的限制。我们展示了使用 JWST 的近红外相机（NIRCam）在跨越 3--5 $μ$m 的两个滤光片下对 AU Microscopii（AU Mic）系统进行的日冕观测。这些数据提供了该系统著名岩屑盘在这些波长下的首批图像，并允许对其性质和形态施加额外约束。在这些数据中对伴星进行深度搜索，我们未识别出任何令人信服的候选体。然而，其灵敏度足以在 $\sim 2^{\prime\prime}$（$\sim 20$ au）之外以 $5σ$ 置信度恢复小至 $\sim 0.1$ 木星质量的行星，这些数据对可能仍存在于大分离处的任何大质量伴星施加了重要约束，并为在极近距离轨道运行的紧凑多行星系统提供了额外背景。此处展示的观测突显了 NIRCam 在这一很大程度上未被探索的波长范围内探测类似岩屑盘的独特能力，并对这个被充分研究的基准系统中的宽轨道巨行星提供了最深度的直接成像约束。
英文摘要：
High-contrast imaging of debris disk systems permits us to assess the composition and size distribution of circumstellar dust, to probe recent dynamical histories, and to directly detect and characterize embedded exoplanets. Observations of these systems in the infrared beyond 2--3 $μ$m promise access to both extremely favorable planet contrasts and numerous scattered-light spectral features -- but have typically been inhibited by the brightness of the sky at these wavelengths. We present coronagraphy of the AU Microscopii (AU Mic) system using JWST's Near Infrared Camera (NIRCam) in two filters spanning 3--5 $μ$m. These data provide the first images of the system's famous debris disk at these wavelengths and permit additional constraints on its properties and morphology. Conducting a deep search for companions in these data, we do not identify any compelling candidates. However, with sensitivity sufficient to recover planets as small as $\sim 0.1$ Jupiter masses beyond $\sim 2^{\prime\prime}$ ($\sim 20$ au) with $5σ$ confidence, these data place significant constraints on any massive companions that might still remain at large separations and provide additional context for the compact, multi-planet system orbiting very close-in. The observations presented here highlight NIRCam's unique capabilities for probing similar disks in this largely unexplored wavelength range, and provide the deepest direct imaging constraints on wide-orbit giant planets in this very well studied benchmark system.
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