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arXiv 1901.05018astro-ph.EPastro-ph.SR
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一个在极区结构的环双星原行星盘

A circumbinary protoplanetary disc in a polar configuration

Grant M. Kennedy, Luca Matrà, Stefano Facchini, Julien Milli, Olja Panić, Daniel Price, David J. Wilner, Mark C. Wyatt, Ben M. Yelverton

摘要:

几乎所有的年轻恒星最初都被气体和尘埃的“原行星”盘所包围,在单恒星的情况下,这些盘中至少有30%会形成行星。原行星盘形成的过程可能会导致初始的不对准,在单星系统中,盘的轨道平面不同于恒星赤道,或者在有两颗恒星的系统中,盘的轨道平面不同于双星轨道平面。动力学的一个怪癖意味着,最初未对准的“环双星”盘-那些围绕两颗恒星的盘-预计将演变成两种可能的稳定构型之一,一种是盘和双星轨道平面共面,另一种是它们垂直的(“极”构型)。先前的工作已经发现了共面的环双星盘,但直到现在还没有发现极轴的例子。在这里,我们报告的第一个发现的原行星环双星盘在极地配置,支持的预测,这样的光盘应该存在。这个圆盘显示出一些类似于单个恒星周围的圆盘的特征,这些特征归因于尘埃的生长。因此,行星形成的第一阶段似乎能够在极环双星盘中进行。

英文摘要:

Nearly all young stars are initially surrounded by `protoplanetary' discs of gas and dust, and in the case of single stars at least 30\% of these discs go on to form planets. The process of protoplanetary disc formation can result in initial misalignments, where the disc orbital plane is different to the stellar equator in single star systems, or to the binary orbital plane in systems with two stars. A quirk of the dynamics means that initially misaligned `circumbinary' discs -- those that surround two stars -- are predicted to evolve to one of two possible stable configurations, one where the disc and binary orbital planes are coplanar, and one where they are perpendicular (a `polar' configuration). Prior work has found coplanar circumbinary discs, but no polar examples were known until now. Here we report the first discovery of a protoplanetary circumbinary disc in the polar configuration, supporting the predictions that such discs should exist. The disc shows some characteristics that are similar to discs around single stars, and that are attributed to dust growth. Thus, the first stages of planet formation appear able to proceed in polar circumbinary discs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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