Brown-Dwarf Magnetism
A brown dwarf beams Jupiter-like radio auroras
Radio and TESS monitoring lock onto a 3.079-hour rotation and a stable pulse pattern reproduced by an auroral magnetosphere model.
Briefed October 8, 2026 · Aliens in the Clouds
Accepted Study · Natural Aurora Model
Diego Martín-Carrero and colleagues combined Very Large Array and very-long-baseline radio observations with TESS optical photometry collected from 2019 through 2023 for the L3.5 dwarf LSPM J0036+1821. The compact radio source is strongly variable and highly circularly polarized, repeating with a 3.07941-hour radio period that agrees with the independently measured optical rotation.
A hybrid auroral model reproduces the asymmetric pulses with a stable main oval plus a variable active field line. Small changes in the emission cone or the field line's longitude can explain the short-term differences. The resulting picture is consistent with electron-cyclotron-maser emission in a structured, Jupiter-like magnetosphere; the data do not establish whether an unseen companion or an internal process supplies the driving interaction.
Why it matters
Auroral radio beams provide a remote probe of magnetic fields and rotation in objects between stars and planets, while also mapping natural signals that future low-frequency searches may encounter.
What the source establishes
Accepted Astronomy & Astrophysics manuscript submitted October 7. The periodic polarized emission is observed; the specific auroral geometry is a model, and a companion is only one possible driver.
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