包含热木星II的恒星日冕的动力学。热木星上的空间天气事件
The Dynamics of Stellar Coronae Harboring Hot-jupiters II. A Space Weather Event on A Hot-jupiter
摘要：
我们进行了一个数值模拟，描述了一个日冕物质抛射（CME）事件的影响，在一个太阳系外的近距离巨行星。我们以类似于模拟地球上空间天气事件的方式驱动CME。模拟包括行星轨道运动，这导致形成一个彗星状的行星磁尾，其方向几乎垂直于CME的传播方向。这一特征与CME到达行星时不会膨胀太多的事实相结合，导致了独特的CME-磁层相互作用，CME本身受到行星磁层的高度影响。我们发现这颗行星被很好地屏蔽了，即使是在相对较弱的内部磁场下。与这样的事件相关的行星角动量损失与总的行星角动量相比可以忽略不计。我们还发现，这是存储在磁层的能量是远远高于在地球的情况下，我们的模拟表明，有一个大规模的变化，磁层电离层电流系统的方向在CME事件。
英文摘要：
We carry out a numerical simulation depicting the effects of a Coronal Mass Ejection (CME) event on a close-in giant planet in an extrasolar system. We drive the CME in a similar manner as in simulations of space weather events on Earth. The simulation includes the planetary orbital motion, which leads to the forming of a comet-like planetary magnetotail which is oriented almost perpendicular to the direction of propagation of the CME. The combination of this feature and the fact that the CME does not expand much by the time it reaches the planet leads to a unique CME-magnetosphere interaction, where the CME itself is highly affected by the presence of the planetary magnetosphere. We find that the planet is well-shielded from CME penetration, even for a relatively weak internal magnetic field. The planetary angular momentum loss associated with such an event is negligible compared to the total planetary angular momentum. We also find that the energy which is deposited in the magnetosphere is much higher than in the case of the Earth, and our simulation suggests there is a large-scale change in the orientation of the magnetosphere-ionosphere current system during the CME event.
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