Disk-mediated accretion burst in a high-mass young stellar object
Disk-mediated accretion burst in a high-mass young stellar object
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DOI：
10.1038/nphys3942
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发表时间：
2016-11
期刊：
影响因子：
19.6
通讯作者：
A. C. O. Garatti;B. Stecklum;R. G. Lopez;J. Eisloffel;T. Ray;A. Sanna;R. Cesaroni;C. Walmsley
中科院分区：
文献类型：
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作者：
A. C. O. Garatti;B. Stecklum;R. G. Lopez;J. Eisloffel;T. Ray;A. Sanna;R. Cesaroni;C. Walmsley
太阳质量的恒星通过盘介导的吸积形成。最近的研究结果表明，这一过程可能是以吸积爆发的形式出现的，可能是由盘的碎裂引起的。虽然不能排除高质量的年轻恒星物体是由它们的低质量兄弟合并而成的，但最新的结果表明，它们更有可能是通过圆盘形成的。因此，盘介导的吸积爆发应该发生。在这里，我们报告的第一个磁盘介导的吸积爆发的发现，从大约20个太阳质量的高质量的年轻恒星物体。我们的近红外图像显示了中央源及其流出空腔的增亮。近红外线光谱揭示了低质量原恒星吸积爆发的典型发射线，但数量级更明亮。此外，释放的能量和推断的质量吸积率也大了几个数量级。我们的研究结果确定盘吸积作为星星形成的共同机制，在整个恒星质量谱。
Solar-mass stars form via disk-mediated accretion. Recent findings indicate that this process is probably episodic in the form of accretion bursts, possibly caused by disk fragmentation,,. Although it cannot be ruled out that high-mass young stellar objects arise from the coalescence of their low-mass brethren, the latest results suggest that they more likely form via disks,,,. It follows that disk-mediated accretion bursts should occur,. Here we report on the discovery of the first disk-mediated accretion burst from a roughly twenty-solar-mass high-mass young stellar object. Our near-infrared images show the brightening of the central source and its outflow cavities. Near-infrared spectroscopy reveals emission lines typical for accretion bursts in low-mass protostars, but orders of magnitude more luminous. Moreover, the released energy and the inferred mass-accretion rate are also orders of magnitude larger. Our results identify disk-accretion as the common mechanism of star formation across the entire stellar mass spectrum.