MAPPING CO GAS IN THE GG TAURI A TRIPLE SYSTEM WITH 50 au SPATIAL RESOLUTION
MAPPING CO GAS IN THE GG TAURI A TRIPLE SYSTEM WITH 50 au SPATIAL RESOLUTION
复制标题
以 50 au 空间分辨率绘制 GG TAURI 三重系统中的 CO 气体图
DOI：
10.3847/0004-637x/820/1/19
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
M. Simon
中科院分区：
文献类型：
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作者：
Ya;A. Dutrey;S. Guilloteau;E. Chapillon;V. Piétu;E. di Folco;J. Bary;T. Beck;H. Beust;Y. Boehler;F. Gueth;J. Huré;A. Pierens;M. Simon
我们的目标是揭示在年轻的多重系统GG Tau A中控制行星形成的物理机制的观测印记。本文介绍了阿尔马对~（12）CO和~（13）CO 3-2和0.9mm连续谱的观测结果，分辨率为0.″35。12 CO 3-2的发射，发现在环星尘埃环（半径<180 Au）的空腔内，没有检测到13 CO的发射，证实了CO气体的存在附近的周盘的GG Tau Aa。外盘和最近检测到的热点躺在尘埃环的外缘的映射在12 CO和13 CO。在外盘的气体排放可以径向分解为一系列轻微重叠的高斯环，这表明存在未解决的差距或下降。最接近盘中心的倾角位于非常接近热点位置的半径处，即250-260 Au。CO的激发条件表明，外盘仍然在环的阴影。热点可能是局部加热过程的结果。后两点强化了这样一个假设，即热点是由一颗嵌入的原行星引导着外盘而产生的。
We aim to unveil the observational imprint of physical mechanisms that govern planetary formation in the young, multiple system GG Tau A. We present ALMA observations of 12CO and 13CO 3–2 and 0.9 mm continuum emission with 0.″35 resolution. The 12CO 3–2 emission, found within the cavity of the circumternary dust ring (at radius <180 au) where no 13CO emission is detected, confirms the presence of CO gas near the circumstellar disk of GG Tau Aa. The outer disk and the recently detected hot spot lying at the outer edge of the dust ring are mapped both in 12CO and 13CO. The gas emission in the outer disk can be radially decomposed as a series of slightly overlapping Gaussian rings, suggesting the presence of unresolved gaps or dips. The dip closest to the disk center lies at a radius very close to the hot spot location at ∼250–260 au. The CO excitation conditions indicate that the outer disk remains in the shadow of the ring. The hot spot probably results from local heating processes. The two latter points reinforce the hypothesis that the hot spot is created by an embedded proto-planet shepherding the outer disk.