13C17O suggests gravitational instability in the HL Tau disc
13C17O suggests gravitational instability in the HL Tau disc
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DOI：
10.1093/mnrasl/slaa014
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发表时间：
2020-01
影响因子：
4.8
通讯作者：
A. Booth;J. Ilee
中科院分区：
文献类型：
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作者：
A. Booth;J. Ilee
我们首次检测到 13C17O J=3-2 向 HL Tau 原行星盘转变。我们发现比之前使用 C18O 排放报告的气体质量要多得多（至少高出十倍）。这使得观察到的总椎间盘质量达到 0.2 M，我们认为这是一个保守的下限。我们对 Toomre Q 剖面的分析表明，这使圆盘进入了引力不稳定状态。不稳定的径向区域（50-110 au）与尘埃盘中拟议的行星雕刻间隙和气体中的螺旋的位置一致。因此，我们建议，如果确认间隙的起源是由于正在形成的巨行星造成的，那么它很可能是通过原行星盘的引力破碎形成的。
We present the first detection of the 13C17O J=3-2 transition toward the HL Tau protoplanetary disc. We find significantly more gas mass (at least a factor of ten higher) than has been previously reported using C18O emission. This brings the observed total disc mass to 0.2 M, which we consider to be a conservative lower limit. Our analysis of the Toomre Q profile suggests that this brings the disc into the regime of gravitational instability. The radial region of instability (50-110 au) coincides with the location of a proposed planet-carved gap in the dust disc and a spiral in the gas. We, therefore, propose that if the origin of the gap is confirmed to be due to a forming giant planet, then it is likely to have formed via the gravitational fragmentation of the protoplanetary disc.