A ROTATING DISK IN THE HH 111 PROTOSTELLAR SYSTEM
A ROTATING DISK IN THE HH 111 PROTOSTELLAR SYSTEM
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HH 111 原恒星系统中的旋转盘
DOI：
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发表时间：
2011
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通讯作者：
Chin
中科院分区：
文献类型：
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作者：
Chin
HH 111原恒星系统是一个年轻的I类系统，有两个源，VLA 1和VLA 2，距离为400 pc。以前，在C18 O中已经看到一个扁平的包层，在VLA 1源附近过渡到一个旋转支撑的盘。本文的后续研究是在2-3倍高的角分辨率下确认旋转支撑盘，在1.33 mm连续谱中获得的角分辨率为120 Au，在13 CO（J = 2-1）和12 CO（J = 2-1）发射中获得的角分辨率为240 Au。1.33毫米的连续发射显示了与垂直于喷流轴的VLA 1源相关的已分辨尘埃盘，其高斯反卷积尺寸为240 Au。向尘埃盘的13 CO和12 CO排放显示开普勒旋转，表明尘埃盘是旋转支撑的。从一个简单的磁盘模型导出的磁盘中的密度和温度分布被发现是类似于明亮的金牛座T盘，这表明磁盘可以演变成金牛座T盘在星星形成的后期阶段。此外，在从盘中出来的13 CO和12 CO中也看到了低速分子流出的暗示。
The HH 111 protostellar system is a young Class I system with two sources, VLA 1 and VLA 2, at a distance of 400 pc. Previously, a flattened envelope has been seen in C18O to be in transition to a rotationally supported disk near the VLA 1 source. The follow-up study here is to confirm the rotationally supported disk at 2–3 times higher angular resolutions, at ∼0.″3 (or 120 AU) in 1.33 mm continuum, and ∼0.″6 (or 240 AU) in 13CO (J = 2–1) and 12CO (J = 2–1) emission obtained with the Submillimeter Array. The 1.33 mm continuum emission shows a resolved dusty disk associated with the VLA 1 source perpendicular to the jet axis, with a Gaussian deconvolved size of ∼240 AU. The 13CO and 12CO emissions toward the dusty disk show a Keplerian rotation, indicating that the dusty disk is rotationally supported. The density and temperature distributions in the disk derived from a simple disk model are found to be similar to those found in bright T Tauri disks, suggesting that the disk can evolve into a T Tauri disk in the late stage of star formation. In addition, a hint of a low-velocity molecular outflow is also seen in 13CO and 12CO coming out from the disk.