Radio detections of stellar systems provide a window onto stellar magnetic activity and the space weather conditions of extrasolar planets — information that is difficult to obtain at other wavelengths. The maturation of low-frequency radio instruments and the plethora of wide-field radio surveys have driven recent advances in observing auroral emissions from radio-bright low-mass stars and exoplanets. To guide us in putting these recent results in context, we introduce the foremost local analogues for the field: solar bursts and the aurorae found on Jupiter. We detail how radio bursts associated with stellar flares are foundational to the study of stellar coronae, and time-resolved radio dynamic spectra offer one of the best prospects for detecting and characterizing coronal mass ejections from other stars. We highlight the possibility of directly detecting coherent radio emission from exoplanetary magnetospheres, as well as early tentative results. We bridge this discussion with the field of brown dwarf radio emission — the larger and stronger magnetospheres of these stars are amenable to detailed study with current instruments. Bright, coherent radio emission is also predicted from magnetic interactions between stars and close-in planets. We discuss the underlying physics of these interactions and the implications of recent provisional detections for exoplanet characterization. We conclude with an overview of outstanding questions in the theory of stellar, star–planet interaction and exoplanet radio emission and the potential of future facilities to answer them.

对恒星系统的无线电探测为了解恒星磁活动和太阳系外行星的太空天气条件提供了一个窗口——这些信息在其他波长下很难获得。低频射电仪器的成熟和大量的宽视场射电巡天推动了观测射电明亮的低质量恒星和系外行星的极光发射的最新进展。为了指导我们将这些最近的结果放在上下文中，我们介绍了该领域最重要的局部类似物：太阳爆发和在木星上发现的极光。我们详细介绍了与恒星耀斑相关的射电暴如何成为恒星日冕研究的基础，而时间分辨射电动力谱为检测和表征来自其他恒星的日冕物质抛射提供了最佳前景之一。我们强调了直接探测系外行星磁层相干无线电发射的可能性，以及早期的初步结果。我们将这一讨论与褐矮星无线电发射领域联系起来——这些恒星更大、更强的磁层适合用当前的仪器进行详细研究。明亮、相干的无线电发射也是从恒星和近行星之间的磁相互作用中预测出来的。我们讨论了这些相互作用的基本物理学以及最近的临时探测对系外行星表征的影响。最后，我们概述了恒星、星-行星相互作用和系外行星无线电发射理论中悬而未决的问题，以及未来设施回答这些问题的潜力。