Mapping radio emitting-region on low-mass stars and brown dwarfs

Yu, S., Doyle, J.G., Hallinan, G. and MacKinnon, A.L. (2011) Mapping radio emitting-region on low-mass stars and brown dwarfs. EPJ Web of Conferences, 16, 06013. (doi: 10.1051/epjconf/20111606013)

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Strong magnetic activity in ultracool dwarfs (UCDs, spectral classes later than M7) have emerged from a number of radio observations, including the periodic beams. The highly (up to 100%) circularly polarized nature of the emission point to an effective amplification mechanism of the high-frequency electromagnetic waves – the electron cyclotron maser (ECM) instability. Several anisotropic velocity distibution models of electrons, including the horseshoe distribution, ring shell distribution and the loss-cone distribution, are able to generate the ECM instability. A magnetic-field-aligned electric potential would play an significant role in the ECM process. We are developing a theoretical model in order to simulate ECM and apply this model to map the radio-emitting region on low-mass stars and brown dwarfs.

Item Type:Articles
Glasgow Author(s) Enlighten ID:MacKinnon, Dr Alexander
Authors: Yu, S., Doyle, J.G., Hallinan, G., and MacKinnon, A.L.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:EPJ Web of Conferences
Publisher:EDP Sciences
Copyright Holders:Copyright © 2011 The Authors
First Published:First published in EPJ Web of Conferences 16:06013
Publisher Policy:Reproduced under a Creative Commons License

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