PERIODIC RADIO EMISSION FROM THE M7 DWARF 2MASS J13142039+1320011: IMPLICATIONS FOR THE MAGNETIC FIELD TOPOLOGY

@article{McLean2011PERIODICRE,
  title={PERIODIC RADIO EMISSION FROM THE M7 DWARF 2MASS J13142039+1320011: IMPLICATIONS FOR THE MAGNETIC FIELD TOPOLOGY},
  author={M. McLean and Edo Berger and Jonathan M. Irwin and Jan Forbrich and Ansgar Reiners},
  journal={The Astrophysical Journal},
  year={2011},
  volume={741}
}
We present multi-epoch radio and optical observations of the M7 dwarf 2MASS J13142039+1320011. We detect a ∼1 mJy source at 1.43, 4.86, 8.46, and 22.5 GHz, making it the most luminous radio emission over the widest frequency range detected from an ultracool dwarf to date. A 10 hr Very Large Array observation reveals that the radio emission varies sinusoidally with a period of 3.89 ± 0.05 hr, and an amplitude of ≈30% at 4.86 GHz and ≈20% at 8.46 GHz. The periodicity is also seen in circular… 

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