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arXiv 0909.5595astro-ph.SR
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通过分辨亚毫米成像的灰尘清除证据

Evidence for dust clearing through resolved submillimeter imaging

J. M. Brown, G. A. Blake, C. Qi, C. P. Dullemond, D. J. Wilner, J. P. Williams

备注：
19 pages, 4 figures, published in ApJ
发表信息：
Astrophys.J.704:496,2009
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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方法来找到中心孔。原行星盘的成像提供了一个独立的检查SED建模。在这里，我们提出了三个33-47 AU半径的内部间隙的直接表征，在磁盘周围LkHa 330，SR 21 N和HD 135344 B，通过340 GHz（880微米）的尘埃连续孔径合成观测获得的亚毫米阵列（SMA）。通过SMA观测，大间隙在~0 \farcs 3处被完全分辨，并且大部分没有尘埃，孔内的细粒固体小于1 ~ 7.5 x 10^-6 Msolar。气体（由原子吸积标记和CO 4.7微米振转辐射追踪）仍然存在于所有三个圆盘的内部区域。对于每一个，内孔表现出相对陡峭的上升，在尘埃排放到外盘，一个功能更有可能源于一个伴星的引力影响，而不是从一个过程，预计将显示一个更浅的梯度，如晶粒生长。重要的是，良好的协议的空间分辨的数据和基于光谱的模型借给信心，目前的解释的SED，其中显着的灰尘排放赤字来自磁盘内部的间隙或孔。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. Imaging of protoplanetry disks provides an independent check of SED modeling. We present here the direct characterization of three 33-47 AU radii inner gaps, in the disks around LkHa 330, SR 21N and HD 135344B, via 340 GHz (880 micron) dust continuum aperture synthesis observations obtained with the Submillimeter Array (SMA). The large gaps are fully resolved at ~0\farcs3 by the SMA observations and mostly empty of dust, with less than 1 - 7.5 x 10^-6 Msolar of fine grained solids inside the holes. Gas (as traced by atomic accretion markers and CO 4.7 micron rovibrational emission) is still present in the inner regions of all three disks. For each, the inner hole exhibits a relatively steep rise in dust emission to the outer disk, a feature more likely to originate from the gravitational influence of a companion body than from a process expected to show a more shallow gradient like grain growth. Importantly, the good agreement of the spatially resolved data and spectrophotometry-based models lends confidence to current interpretations of SEDs, wherein the significant dust emission deficits arise 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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