标题： 类似太阳大气对热木星电子束的热响应：一个数值实验 显示英文标题

标题： Thermal Response of A Solar-like Atmosphere to An Electron Beam from A Hot Jupiter: A Numerical Experiment

摘要： 我们通过进行一维磁流体力学数值实验，研究了类似太阳的恒星大气对从热木星注入的电子束的热响应，实验中包含了非线性波耗散、辐射冷却和热传导。 在我们的实验中，恒星大气是非旋转的，并被建模为从恒星光球到行星扩展的超辐射状开放磁通管。假设电子束是由行星磁层的重联区域产生的。 然后，电子束的影响在我们的模拟中以冠层底部（库仑碰撞变得有效的位置）的束动量和能量耗散的形式实现。 当电子束提供足够的能量时，在色球层会形成一个温暖区域。 该温暖区域极大地增强了与色球层和过渡区温度相对应的辐射通量。 由于热不稳定性的存在，该温暖区域还可以间歇性地对与冠层温度相关的辐射通量做出贡献。 然而，由于加热斑点面积较小，由束诱导的色球层辐射的总光度比HD 179949观测到的Ca II发射小几个数量级。 显示英文摘要

摘要： We investigate the thermal response of the atmosphere of a solar-type star to an electron beam injected from a hot Jupiter by performing a 1-dimensional magnetohydrodynamic numerical experiment with non-linear wave dissipation, radiative cooling, and thermal conduction. In our experiment, the stellar atmosphere is non-rotating and is modelled as a 1-D open flux tube expanding super-radially from the stellar photosphere to the planet. An electron beam is assumed to be generated from the reconnection site of the planet's magnetosphere. The effects of the electron beam are then implemented in our simulation as dissipation of the beam momentum and energy at the base of the corona where the Coulomb collisions become effective. When the sufficient energy is supplied by the electron beam, a warm region forms in the chromosphere. This warm region greatly enhances the radiative fluxes corresponding to the temperature of the chromosphere and transition region. The warm region can also intermittently contribute to the radiative flux associated with the coronal temperature due to the thermal instability. However, owing to the small area of the heating spot, the total luminosity of the beam-induced chromospheric radiation is several orders of magnitude smaller than the observed Ca II emissions from HD 179949.