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ASKAP Detection of Periodic and Elliptically Polarized Radio Pulses from UV Ceti | | Andrew Zic
; Adam Stewart
; Emil Lenc
; Tara Murphy
; Christene Lynch
; David L. Kaplan
; Aidan Hotan
; Craig Anderson
; John D. Bunton
; Aaron Chippendale
; Stacy Mader
; Chris Phillips
; | | Date: |
15 Jun 2019 | | Abstract: | 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. | | Source: | arXiv, 1906.6570 | | Services: | Forum | Review | PDF | Favorites | |
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