Mapping radio emitting-region on low-mass stars and brown dwarfs
- Creators
- Yu, S.
- Doyle, J. G.
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Hallinan, G.
- MacKinnon, A. L.
Abstract
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.
Additional Information
© 2011 Owned by the authors, published by EDP Sciences. This is an Open Access article distributed under the terms of the Creative Commons Attribution-Noncommercial License 3.0, which permits unrestricted use, distribution, and reproduction in any noncommercial medium, provided the original work is properly cited. Published online: 18 July 2011.Attached Files
Published - epjconf_bdep2009_06013.pdf
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Additional details
- Eprint ID
- 43676
- Resolver ID
- CaltechAUTHORS:20140205-114623355
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2014-02-05Created from EPrint's datestamp field
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2021-11-10Created from EPrint's last_modified field