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Comparative analysis of two formation scenarios of bursty radio emission from ultracool dwarfs

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arxiv 1111.7019 v1 pith:D7HLJESC submitted 2011-11-29 astro-ph.SR

A. A. Kuznetsov , J. G. Doyle , S. Yu , G. Hallinan , A. Antonova , A. Golden This is my paper · ORCID
classification astro-ph.SR
keywords emissionradiodwarfsultracoolactivedipoledwarffound
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Recently, a number of ultracool dwarfs have been found to produce periodic radio bursts with high brightness temperature and polarization degree; the emission properties are similar to the auroral radio emissions of the magnetized planets of the Solar System. We simulate the dynamic spectra of radio emission from ultracool dwarfs. The emission is assumed to be generated due to the electron-cyclotron maser instability. We consider two source models: the emission caused by interaction with a satellite and the emission from a narrow sector of active longitudes; the stellar magnetic field is modeled by a tilted dipole. We have found that for the dwarf TVLM 513-46546, the model of the satellite-induced emission is inconsistent with the observations. On the other hand, the model of emission from an active sector is able to reproduce qualitatively the main features of the radio light curves of this dwarf; the magnetic dipole seems to be highly tilted (by about 60 degrees) with respect to the rotation axis.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 31 citations worldwide. Full citation record

  1. Volcanic Satellites and Ion Escape in the Magnetospheres of Ultra-Cool and Brown Dwarf Stars

    astro-ph.EP 2026-07 conditional novelty 6.0 of 10

    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.

  2. GMRT Survey of Radio Emission from Magnetic Massive Stars -- I: Emission from Single Stars at sub-GHz Frequencies

    astro-ph.SR 2026-05 unverdicted novelty 5.0 of 10

    GMRT sub-GHz survey of 44 magnetic hot stars detects emission in 11 cases and finds scaling of radio luminosity with magnetic field and rotation period consistent with higher-frequency work.

  3. Discovering and Characterising Exoplanets and Ultracool Dwarfs with the Square Kilometre Array

    astro-ph.EP 2026-07 unverdicted novelty 4.5 of 10

    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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