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首页> 外文期刊>The Astrophysical journal >ALMA OBSERVATIONS OF A MISALIGNED BINARY PROTOPLANETARY DISK SYSTEM IN ORION
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ALMA OBSERVATIONS OF A MISALIGNED BINARY PROTOPLANETARY DISK SYSTEM IN ORION

机译:猎户座二元原行星盘错误的ALMA观测

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We present Atacama Large Millimeter/Submillimeter Array (ALMA) observations of a wide binary system in Orion, with projected separation 440?AU, in which we detect submillimeter emission from the protoplanetary disks around each star. Both disks appear moderately massive and have strong line emission in CO 3-2, HCO+ 4-3, and HCN 3-2. In addition, CS 7-6 is detected in one disk. The line-to-continuum ratios are similar for the two disks in each of the lines. From the resolved velocity gradients across each disk, we constrain the masses of the central stars, and show consistency with optical-infrared spectroscopy, both indicative of a high mass ratio ~9. The small difference between the systemic velocities indicates that the binary orbital plane is close to face-on. The angle between the projected disk rotation axes is very high, ~72°, showing that the system did not form from a single massive disk or a rigidly rotating cloud core. This finding, which adds to related evidence from disk geometries in other systems, protostellar outflows, stellar rotation, and similar recent ALMA results, demonstrates that turbulence or dynamical interactions act on small scales well below that of molecular cores during the early stages of star formation.
机译:我们介绍了猎户座宽双星系统的Atacama大毫米/亚毫米阵列(ALMA)观测结果,投影间隔为440?AU,在其中我们检测到了每个恒星周围原行星盘的亚毫米辐射。两个盘片均表现为中等质量,并且在CO 3-2,HCO + 4-3和HCN 3-2中具有较强的线发射。此外,在一个磁盘中检测到CS 7-6。每条线中的两个磁盘的线连续谱比率相似。从每个磁盘上的分辨速度梯度来看,我们限制了中心恒星的质量,并与光学红外光谱法保持一致,这两者均表明〜9的高质量比。系统速度之间的微小差异表明二元轨道平面接近面对面。投影的磁盘旋转轴之间的角度非常高,约为72°,这表明该系统不是由单个块状磁盘或刚性旋转的云芯形成的。这一发现增加了其他系统的磁盘几何形状,星体外流,恒星自转以及类似ALMA最近的结果的相关证据,表明在恒星形成初期,湍流或动力相互作用的小尺度作用远低于分子核的作用。 。

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