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arXiv:0805.4010v1[astro-ph]26May2008 Draft version May 27, 2008
 

Summary: arXiv:0805.4010v1[astro-ph]26May2008
Draft version May 27, 2008
Preprint typeset using LATEX style emulateapj v. 10/09/06
CONFIRMATION OF THE ELECTRON CYCLOTRON MASER INSTABILITY AS THE DOMINANT SOURCE
OF RADIO EMISSION FROM VERY LOW MASS STARS AND BROWN DWARFS
G. Hallinan1
, A. Antonova2
, J.G. Doyle2
, S. Bourke1,3
, C. Lane1
and A. Golden1
Draft version May 27, 2008
ABSTRACT
We report on radio observations of the M8.5 dwarf LSR J1835+3259 and the L3.5 dwarf 2MASS
J00361617+1821104, which provide the strongest evidence to date that the electron cyclotron maser
instability is the dominant mechanism producing radio emission in the magnetospheres of ultracool
dwarfs. As has previously been reported for the M9 dwarf TVLM 513-46546, periodic pulses of 100%
circularly polarized, coherent radio emission are detected from both dwarfs with periods of 2.840.01
and 3.080.05 hours respectively for LSR J1835+3259 and 2MASS J00361617+1821104. Importantly,
periodic unpolarized radio emission is also detected from 2MASS J00361617+1821104, and brightness

  

Source: Armagh Observatory

 

Collections: Physics