A Panchromatic View of Brown Dwarf Aurorae
J. Sebastian Pineda, Gregg Hallinan, and Melodie M. Kao

TL;DR
This paper reviews evidence of auroral activity in brown dwarfs, highlighting its manifestations across wavelengths, its potential origins, and the connection to magnetic and satellite interactions, marking a transition from stellar to planetary-like magnetic phenomena.
Contribution
It provides a comprehensive compilation and analysis of multi-wavelength surveys of brown dwarf magnetic activity, emphasizing the auroral phenomena and their underlying physical mechanisms.
Findings
Auroral activity manifests in Hα and radio emissions in brown dwarfs.
Large amplitude near-infrared variability is mainly due to atmospheric clouds, not aurorae.
A connection exists between auroral Hα emission and quiescent radio emission.
Abstract
Stellar coronal activity has been shown to persist into the low-mass star regime, down to late M-dwarf spectral types. However, there is now an accumulation of evidence suggesting that at the end of the main sequence there is a transition in the nature of the magnetic activity from chromospheric and coronal to planet-like and auroral, from local impulsive heating via flares and MHD wave dissipation to energy dissipation from strong large-scale magnetospheric current systems. We examine this transition and the prevalence of auroral activity in brown dwarfs through a compilation of multi-wavelength surveys of magnetic activity, including radio, X-ray, and optical. We compile the results of those surveys and place their conclusions in the context of auroral emission as the consequence of large-scale magnetospheric current systems that accelerate energetic electron beams and drive the…
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