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Published February 10, 2012 | Published + Submitted
Journal Article Open

Comparative Analysis of Two Formation Scenarios of Bursty Radio Emission from Ultracool Dwarfs


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 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°) with respect to the rotation axis.

Additional Information

© 2012 American Astronomical Society. Received 2011 August 16; accepted 2011 November 29; published 2012 January 27. A.A.K., J.G.D., and S.Y. thank the Leverhulme Trust for financial support. G.H. is a Jansky Fellow of the National Radio Astronomy Observatory. A.A. gratefully acknowledges the support of the Bulgarian National Science Fund (grant no. DDVU02/40-2010).

Attached Files

Published - 0004-637X_746_1_99.pdf

Submitted - 1111.7019v1.pdf


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