TW Hya星系内盘的空间解析
Spatially Resolving the Inner Disk of TW Hya
摘要：
我们提出凯克干涉仪观测TW Hya，空间上解决其发射在2微米波长。结合现有的K波段遮蔽和近红外光度测量分析这些数据，我们得出结论，内盘由光学薄，亚微米大小的尘埃组成，从4 AU延伸到中心恒星的0.06 AU以内。内盘边缘可能被磁层截断。即使我们考虑到内盘中气体的存在，这些小尘埃颗粒对辐射爆发的存活时间比系统的年龄短几个数量级，这表明通过较大物体的碰撞不断补充。
英文摘要：
We present Keck Interferometer observations of TW Hya that spatially resolve its emission at 2 micron 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, sub-micron-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 blow-out that are orders of magnitude shorter than the age of the system, suggesting continual replenishment through collisions of larger bodies.
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