Coherent low-frequency (≲200 MHz) radio emission from stars encodes the conditions of the outer corona, mass-ejection events and space weather^1,2,3,4,5. Previous low-frequency searches for radio-emitting stellar systems have lacked the sensitivity to detect the general population, instead largely focusing on targeted studies of anomalously active stars^5,6,7,8,9. Here we present 19 detections of coherent radio emission associated with known M dwarfs from a blind flux-limited low-frequency survey. Our detections show that coherent radio emission is ubiquitous across the M dwarf main sequence, and that the radio luminosity is independent of known coronal and chromospheric activity indicators. While plasma emission can generate the low-frequency emission from the most chromospherically active stars of our sample^1,10, the origin of the radio emission from the most quiescent sources is yet to be ascertained. Large-scale analogues of the magnetospheric processes seen in gas giant planets^3,11,12 probably drive the radio emission associated with these quiescent stars. The slowest-rotating stars of this sample are candidate systems to search for star–planet interaction signatures.

来自恒星的相干低频（≲ 200 MHz）无线电发射编码了外日冕、质量抛射事件和太空天气^1,2,3,4,5的条件。以前对无线电发射恒星系统的低频搜索缺乏探测普通人群的灵敏度，而主要集中在对异常活跃恒星的针对性研究^5,6,7,8,9. 在这里，我们展示了 19 次与已知 M 矮星相关的相干无线电发射检测，这些检测来自盲通量限制低频调查。我们的检测表明，相干无线电发射在 M 矮星主序带中无处不在，并且射电光度与已知的日冕和色球活动指标无关。虽然等离子体发射可以从我们的样本^{1,10 中}最活跃的恒星产生低频发射，但来自最静止源的无线电发射的起源尚待确定。在气态巨行星中看到的磁层过程的大规模类似物^3,11,12可能驱动与这些静止恒星相关的无线电发射。该样本中旋转最慢的恒星是搜索星-行星相互作用特征的候选系统。