LkH $α$ 330：通过分辨亚毫米成像清除灰尘的证据
LkH$α$ 330: Evidence for dust clearing through resolved submillimeter imaging
摘要：
中红外分光光度观测揭示了一个小子类的拱星盘与光谱能量分布（SED）暗示大的内部差距与低尘埃含量。然而，这些数据仅提供了一种间接的和依赖于模型的寻找中心孔的方法。在这里，我们提出了一个40 AU半径的内间隙在磁盘周围LkHa 330通过340 GHz（880微米）的尘埃连续成像的亚毫米阵列（SMA）的直接表征。SMA观测完全分辨出了这个大间隙，并且在40 AU的范围内几乎没有尘埃，固体粒子数小于1.3 x 10^-6 M太阳。气体（由吸积标记和CO M带发射跟踪）仍然存在于内盘中，间隙的外缘急剧上升-与重力扰动的根本原因比更渐进的过程（如晶粒生长）更好地吻合。重要的是，良好的协议的空间分辨数据和基于分光光度计的模型借给信心，目前的解释与显着的灰尘排放赤字所产生的磁盘与内部间隙或孔的SEDs。因此，可以预期进一步的基于SED的搜索将产生可以以高空间分辨率检查的许多额外的候选者。
英文摘要：
Mid-infrared spectrophotometric observations have revealed a small sub-class of circumstellar disks with spectral energy distributions (SEDs) suggestive of large inner gaps with low dust content. However, such data provide only an indirect and model dependent method of finding central holes. We present here the direct characterization of a 40 AU radius inner gap in the disk around LkHa 330 through 340 GHz (880 micron) dust continuum imaging with the Submillimeter Array (SMA). This large gap is fully resolved by the SMA observations and mostly empty of dust with less than 1.3 x 10^-6 M_solar of solid particles inside of 40 AU. Gas (as traced by accretion markers and CO M-band emission) is still present in the inner disk and the outer edge of the gap rises steeply -- features in better agreement with the underlying cause being gravitational perturbation than a more gradual process such as grain growth. Importantly, the good agreement of the spatially resolved data and spectrophometry-based model lends confidence to current interpretations of SEDs with significant dust emission deficits as arising from disks with inner gaps or holes. Further SED-based searches can therefore be expected to yield numerous additional candidates that can be examined at high spatial resolution.
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