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Evidence for a radiation belt around a brown dwarf
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Radio observations of ultracool dwarfs, objects comprising brown dwarfs and the very lowest mass stars, have mainly focused on analyzing their light-curve and spectral energy distributions providing valuable insights into their magnetic fields. However, spatially-resolved studies of such magnetospheres have been elusive so far. Radio interferometric observations of the brown dwarf LSR J1835+3259 reveal an extended magnetosphere with a morphology compatible with the presence of a radiation belt, similar to that of Jupiter and Earth, consisting of energetic particles confined via magnetic mirroring. Our finding suggests that radio emitting ultracool dwarfs may behave as scaled up versions of Jupiter, validating the connection between dipole-ordered magnetic fields and the presence of belt-like morphologies and aurorae beyond our Solar System.
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Cited by 3 Pith papers
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Volcanic Satellites and Ion Escape in the Magnetospheres of Ultra-Cool and Brown Dwarf Stars
Plasma feeding the radio magnetosphere of LSR J1835+3259 could be sourced by a weak stellar ionospheric outflow or, more plausibly, by a tidally heated Io-like volcanic satellite orbiting within ~10 stellar radii.
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Radiative Back-Reaction on Charged Particle Motion in the Dipole Magnetosphere of Neutron Stars
Radiative back-reaction makes charged particles under an attractive Lorentz force fall onto a magnetized neutron star, while under a repulsive force they either widen their orbits or fall, depending on the starting latitude.
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Discovering and Characterising Exoplanets and Ultracool Dwarfs with the Square Kilometre Array
The Square Kilometre Array is projected to enable first radio detections of giant exoplanets, thousands of ultracool dwarfs, and few-Earth-mass planets around nearby UCDs via VLBI astrometry.
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