An Aurorae Spotted On Star 18.5 Years Away

Magnetospherically driven optical and radio aurorae at the end of the stellar main sequence : Nature
Aurorae are detected from all the magnetized planets in our Solar
System, including Earth. They are powered by magnetospheric
current systems that lead to the precipitation of energetic electrons
into the high-latitude regions of the upper atmosphere. In the case
of the gas-giant planets, these aurorae include highly polarized
radio emission at kilohertz and megahertz frequencies produced
by the precipitating electrons, as well as continuum and line emis-
sion in the infrared, optical, ultraviolet and X-ray parts of the
spectrum, associated with the collisional excitation and heating
of the hydrogen-dominated atmosphere. Here we report sim-
ultaneous radio and optical spectroscopic observations of an object
at the end of the stellar main sequence, located right at the bound-
ary between stars and brown dwarfs, from which we have detected
radio and optical auroral emissions both powered by magneto-
spheric currents.

Source: Magnetospherically driven optical and radio aurorae at the end of the stellar main sequence : Nature