A triple-star system with a misaligned and warped circumstellar disk shaped by disk tearing
A triple-star system with a misaligned and warped circumstellar disk shaped by disk tearing
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DOI：
10.1126/science.aba4633
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发表时间：
2020-04
期刊：
影响因子：
56.9
通讯作者：
S. Kraus;A. Kreplin;Alison K. Young;M. Bate;J. Monnier;T. Harries;H. Avenhaus;J. Kluska;A. Laws
中科院分区：
文献类型：
--
作者：
S. Kraus;A. Kreplin;Alison K. Young;M. Bate;J. Monnier;T. Harries;H. Avenhaus;J. Kluska;A. Laws
在星星形成的过程中，一个由气体和尘埃组成的圆盘在年轻的星星周围形成，控制着更多物质的吸积。一旦星星形成，任何残留的物质都可以形成行星。如果一个双星或三星星星在盘的中心形成，理论模型预测，由它们的轨道引起的潮汐扭矩可以撕裂盘，这个过程被称为盘撕裂。克劳斯等人使用多台近红外和亚毫米望远镜，利用干涉测量和偏振测量技术，观察了附近的年轻三星系统猎户座GW。他们发现了具有不同方向的多个环和部分圆盘弯曲的证据，两者都是由圆盘撕裂产生的。科学，本期第1233页附近三星系统中的拱星盘具有由盘撕裂产生的复杂结构。年轻的恒星被一个由气体和尘埃组成的星周盘所包围，行星可以在其中形成。多个星星系统中的引力可以破坏圆盘。理论模型预测，如果圆盘与恒星的轨道平面不对齐，圆盘就会扭曲并破裂成旋进环，这种现象称为圆盘撕裂。我们目前的观察三星系统GW猎户座，寻找磁盘撕裂的证据。我们的图像显示了一个偏心环，与轨道平面和外盘不对齐。环在盘的强烈翘曲的中间区域上投射阴影。如果行星可以在扭曲的盘内形成，盘撕裂可以提供一种在倾斜轨道上形成宽分离行星的机制。
Ripping up a circumstellar disk During the process of star formation, a disk of gas and dust forms around the young star, controlling the accretion of more material. Once the star has formed, any leftover material in this circumstellar disk can form planets. If a binary or triple star forms at the center of the disk, theoretical models predict that tidal torques caused by their orbits can rip the disk apart, in a process known as disk tearing. Kraus et al. observed the nearby young triple-star system GW Orionis with multiple near-infrared and submillimeter telescopes, using the techniques of interferometry and polarimetry. They found evidence for multiple rings with different orientations and warping of part of the disk, both produced by disk tearing. Science, this issue p. 1233 The circumstellar disk in a nearby triple-star system has complex structures produced by disk tearing. Young stars are surrounded by a circumstellar disk of gas and dust, within which planet formation can occur. Gravitational forces in multiple star systems can disrupt the disk. Theoretical models predict that if the disk is misaligned with the orbital plane of the stars, the disk should warp and break into precessing rings, a phenomenon known as disk tearing. We present observations of the triple-star system GW Orionis, finding evidence for disk tearing. Our images show an eccentric ring that is misaligned with the orbital planes and the outer disk. The ring casts shadows on a strongly warped intermediate region of the disk. If planets can form within the warped disk, disk tearing could provide a mechanism for forming wide-separation planets on oblique orbits.