Astronomers observe the first radiation belt seen outside of our solarsystem nature
hypothesized to trace low-level coronal flaring. Here we present high resolution imaging of the ultracool dwarf LSR J1835+3259 at 8.4 GHz demonstrating that its quiescent radio emission is spatially resolved and traces a double-lobed and axisymmetric structure similar in morphology to the Jovian radiation belts.
Up to 18 ultracool dwarf radii separate the two lobes, which are stably present in three observations spanning more than one year. For plasma confined by the magnetic dipole of LSR J1835+3259, we estimate 15 MeV electron energies consistent with Jupiter’s radiation belts.
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