Spatially Resolving the Inner Disk of TW Hydrae

Spatially Resolving the Inner Disk of TW Hydrae
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空间解析 TW Hydrae 的内盘

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发表时间：
2006
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通讯作者：
L. Hillenbrand
L. Hillenbrand
中科院分区：
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文献类型：
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作者：
Joshua A Eisner;Eugene Chiang;L. Hillenbrand

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我们展示了凯克干涉仪对 TW Hya 的观测结果，在空间上解析了 2 μm 波长的发射。将这些数据与现有的 K 波段遮蔽和近红外光度测量一起分析，我们得出结论，内盘由光学上薄的亚微米大小的尘埃组成，从中心恒星的约 4 个天文单位延伸到 0.06 个天文单位范围内。内盘边缘可以被磁层截断。即使我们考虑到内盘中存在气体，这些小尘埃颗粒在辐射井喷中的生存时间也比系统的年龄短几个数量级，这表明通过较大天体的碰撞不断补充。
We present Keck Interferometer observations of TW Hya that spatially resolve its emission at 2 μm wavelength. Analyzing these data together with existing K-band veiling and near-infrared photometric measurements, we conclude that the inner disk consists of optically thin, submicron-sized dust extending from ~4 AU to within 0.06 AU of the central star. The inner disk edge may be magnetospherically truncated. Even if we account for the presence of gas in the inner disk, these small dust grains have survival times against radiation blowout that are orders of magnitude shorter than the age of the system, suggesting continual replenishment through collisions of larger bodies.