ASKAP Detection of Periodic and Elliptically Polarized Radio Pulses from UV Ceti. (arXiv:1906.06570v1 [astro-ph.SR])

ASKAP Detection of Periodic and Elliptically Polarized Radio Pulses from UV Ceti. (arXiv:1906.06570v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Zic_A/0/1/0/all/0/1">Andrew Zic</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stewart_A/0/1/0/all/0/1">Adam Stewart</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lenc_E/0/1/0/all/0/1">Emil Lenc</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Murphy_T/0/1/0/all/0/1">Tara Murphy</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lynch_C/0/1/0/all/0/1">Christene Lynch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kaplan_D/0/1/0/all/0/1">David L. Kaplan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hotan_A/0/1/0/all/0/1">Aidan Hotan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Anderson_C/0/1/0/all/0/1">Craig Anderson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bunton_J/0/1/0/all/0/1">John D. Bunton</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chippendale_A/0/1/0/all/0/1">Aaron Chippendale</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mader_S/0/1/0/all/0/1">Stacy Mader</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Phillips_C/0/1/0/all/0/1">Chris Phillips</a>

Active M-dwarfs are known to produce bursty radio emission, and
multi-wavelength studies have shown that Solar-like magnetic activity occurs in
these stars. However, coherent bursts from active M-dwarfs have often been
difficult to interpret in the Solar activity paradigm. We present Australian
Square Array Pathfinder (ASKAP) observations of UV Ceti at a central frequency
of 888 MHz. We detect several periodic, coherent pulses occurring over a
timescale consistent with the rotational period of UV Ceti. The properties of
the pulsed emission show that they originate from the electron cyclotron maser
instability, in a cavity $sim7$ orders of magnitude less dense than the mean
coronal density at the estimated source altitude. These results confirm that
auroral activity can occur in active M-dwarfs, suggesting that these stars mark
the beginning of the transition from Solar-like to auroral magnetospheric
behaviour. These results demonstrate the capabilities of ASKAP for detecting
polarized, coherent bursts from active stars and other systems.

Active M-dwarfs are known to produce bursty radio emission, and
multi-wavelength studies have shown that Solar-like magnetic activity occurs in
these stars. However, coherent bursts from active M-dwarfs have often been
difficult to interpret in the Solar activity paradigm. We present Australian
Square Array Pathfinder (ASKAP) observations of UV Ceti at a central frequency
of 888 MHz. We detect several periodic, coherent pulses occurring over a
timescale consistent with the rotational period of UV Ceti. The properties of
the pulsed emission show that they originate from the electron cyclotron maser
instability, in a cavity $sim7$ orders of magnitude less dense than the mean
coronal density at the estimated source altitude. These results confirm that
auroral activity can occur in active M-dwarfs, suggesting that these stars mark
the beginning of the transition from Solar-like to auroral magnetospheric
behaviour. These results demonstrate the capabilities of ASKAP for detecting
polarized, coherent bursts from active stars and other systems.

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