Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pobeo..90..117a&link_type=abstract
Publications of the Astronomical Observatory of Belgrade, vol. 90, pp. 117-120
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The detection of both quiescent and flaring nonthermal radio emission from a number of late M-, L-type dwarfs indicates the presence of magnetic activity in the ultracool dwarf domain. What is more, four of those dwarfs show periodic, highly circularly polarized pulsing signatures consistent with electron cyclotron maser emission. The pulsing emission can be used as a powerful diagnostic of magnetic field strengths and topologies of very low-mass stars and brown dwarfs. Here we present our results from multi-epoch VLA observations of the M8.5 dwarf TVLM 513-46546 which provide evidence of the presence of stable large-scale magnetic fields with kilogaus strengths, as well as broadband dynamic spectra of the individual pulses in the emission of the dwarf obtained using the Arecibo Observatory. We discuss how such observations can be used for mapping the radio coronae of UCDs.
Antonova Antoaneta
Doyle Gerry J.
Golden Aaron
Hallinan Gregg
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