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The well-studied M9 dwarf TVLM 513-46546 is a rapid rotator (P_rot ~ 2 hr)hosting a stable, dipolar magnetic field of ~3 kG surface strength. Here wereport its detection with ALMA at 95 GHz at a mean flux density of $56 \pm 12$uJy, making it the first ultracool dwarf detected in the millimeter band,excluding young, disk-bearing objects. We also report flux density measurementsfrom unpublished archival VLA data and new optical monitoring data from theLiverpool Telescope. The ALMA data are consistent with a power-law radiospectrum that extends continuously between centimeter and millimeterwavelengths. We argue that the emission is due to the synchrotron process,excluding thermal, free-free, and electron cyclotron maser emission as possiblesources. During the interval of the ALMA observation that phases with themaximum of the object's optical variability, the flux density is higher at a~1.8 sigma significance level. These early results show how ALMA opens a newwindow for studying the magnetic activity of ultracool dwarfs, particularlyshedding light on the particle acceleration mechanism operating in theirimmediate surroundings.

The First Millimeter Detection of a Non-Accreting Ultracool Dwarf