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IMAGING THE DISK AROUND TW HYDRAE WITH THE SUBMILLIMETER ARRAY

机译:使用子弹头阵列对TW HYDRAE周围的磁盘进行成像

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摘要

We present ~2″-4″ aperture synthesis observations of the circumstellar disk surrounding the nearby young star TW Hya in the CO J = 2-1 and J = 3-2 lines and associated dust continuum obtained with the partially completed Submillimeter Array. The extent and peak flux of the 230 and 345 GHz dust emission follow closely the predictions of the irradiated accretion disk model of Calvet et al. The resolved molecular line emission extends to a radius of at least 200 AU, the full extent of the disk visible in scattered light, and shows a clear pattern of Keplerian rotation. Comparison of the images with two-dimensional Monte Carlo models constrains the disk inclination angle to 7° ± 1°. The CO emission is optically thick in both lines, and the kinetic temperature in the line formation region is ~ 20 K. Substantial CO depletion, by an order of magnitude or more from canonical dark cloud values, is required to explain the characteristics of the line emission.
机译:我们给出了围绕CO J = 2-1和J = 3-2线的附近年轻恒星TW Hya周围的圆星盘的〜2“ -4”孔径合成观测,以及通过部分完成的亚毫米波阵列获得的相关尘埃连续体。 230和345 GHz尘埃排放的程度和峰值通量与Calvet等人的辐照吸积盘模型的预测密切相关。分辨出的分子线发射延伸到至少200 AU的半径,在散射光下可见圆盘的整个范围,并显示开普勒旋转的清晰模式。与二维蒙特卡洛模型的图像比较将磁盘倾斜角度限制为7°±1°。两条线的CO发射在光学上都较厚,并且线形成区域中的动力学温度约为20K。需要从典型的暗云值中将CO大量耗损一个数量级或更多,才能解释该线的特性。发射。

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