论文标题
M-dwarf恒星中的单半球发电机
Single-hemisphere dynamos in M-dwarf stars
论文作者
论文摘要
一定质量下方的M-dwarf恒星从其核心到光传感器是对流的。这些完全对流的物体非常多，非常有磁性，并且可能是许多系外行星的宿主。在这里，我们首次研究了分层，旋转完全对流的M-dwarf恒星的动力学作用。重要的是，我们使用新技术将正确的完整球几何形状捕获到恒星中心。我们发现这些系统中令人惊讶的发电机状态，与先前的恒星发电机相比，全球尺度的平均场极限限于单个半球。这些半球恒星可能与周围环境有很大不同的相互作用，对系外行星的可居住性和恒星旋转具有重要意义。
M-dwarf stars below a certain mass are convective from their cores to their photospheres. These fully convective objects are extremely numerous, very magnetically active, and the likely hosts of many exoplanets. Here we study, for the first time, dynamo action in simulations of stratified, rotating fully convective M-dwarf stars. Importantly, we use new techniques to capture the correct full ball geometry down to the center of the star. We find surprising dynamo states in these systems, with the global-scale mean fields confined strongly to a single hemisphere, in contrast to prior stellar dynamo solutions. These hemispheric-dynamo stars are likely to have profoundly different interactions with their surroundings, with important implications for exoplanet habitability and stellar spindown.
