磁化恒星-行星相互作用的分类：弓形激波、尾流和螺旋流
Classification of magnetized star--planet interactions: bow shocks, tails, and inspiraling flows
摘要：
距离较近的系外行星通过引力和磁化等离子体流出与其宿主恒星相互作用。由此产生的丰富动态可能会导致不同的可观察特征。我们的目标是研究和分类的形态学的不同类型的相互作用，可以发生在一个巨大的近距离行星（热木星）和它的宿主恒星之间，根据物理参数的特点系统。我们进行3D磁流体动力学数值模拟，模拟恒星-行星的相互作用，将一颗恒星，一个热木星，和现实的恒星和行星流出。我们探索了广泛的参数和分析的流动结构和磁拓扑结构的发展。我们的研究表明，恒星-行星相互作用分为四个一般类型，根据三个特征长度尺度的相对大小，量化的行星磁场，行星外流，恒星引力场的相互作用区域的影响。我们描述了这些相互作用的动力学和它们产生的流动结构，其中包括弓形激波，彗星型的尾巴，和吸气吸积流。我们指出了每个分类的情况下的显着特点，并讨论了他们的一些观测相关的属性。根据一组基本的恒星、行星和轨道参数，可以对恒星-行星系统的磁化相互作用进行分类，并预测它们的一般形态。
英文摘要：
Close-in exoplanets interact with their host stars gravitationally as well as via their magnetized plasma outflows. The rich dynamics that arises may result in distinct observable features. Our objective is to study and classify the morphology of the different types of interaction that can take place between a giant close-in planet (a Hot Jupiter) and its host star, based on the physical parameters that characterize the system. We perform 3D magnetohydrodynamic numerical simulations to model the star--planet interaction, incorporating a star, a Hot Jupiter, and realistic stellar and planetary outflows. We explore a wide range of parameters and analyze the flow structures and magnetic topologies that develop. Our study suggests the classification of star--planet interactions into four general types, based on the relative magnitudes of three characteristic length scales that quantify the effects of the planetary magnetic field, the planetary outflow, and the stellar gravitational field in the interaction region. We describe the dynamics of these interactions and the flow structures that they give rise to, which include bow shocks, cometary-type tails, and inspiraling accretion streams. We point out the distinguishing features of each of the classified cases and discuss some of their observationally relevant properties. The magnetized interactions of star--planet systems can be categorized, and their general morphologies predicted, based on a set of basic stellar, planetary, and orbital parameters.
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