The radio transient sky from minutes to hours: a volume-limited ultracool dwarf survey

Details The radio transient sky from minutes to hours: a volume-limited ultracool dwarf survey The radio transient sky from minutes to hours: a volume-limited ultracool dwarf survey

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atnf.prop.3254r&link_type=abstract

ATNF proposal C2313, Semester: April, 2010

Physics

Magnetic Fields, Transients, Atca

Scientific paper

We propose the first volume-limited survey for transient and quiescent radio emission from ultracool dwarf stars. Ultracool dwarfs are the coolest stars, and include the sub-stellar brown dwarfs. Transient radio emission, as periodic pulses and isolated flares on timescales of minutes, along with quiescence, was recently discovered from some ultracool dwarfs, with significantly higher luminosities than predicted by physical models. The emission is thought to be magnetospheric and non-thermal. The pulses and flares are 100% circularly-polarised and coherent. Here, through ATCA observations of 15 targets within 10 pc, we will characterise the incidence of transient and quiescent emission, and correlate these results with physical stellar properties such as rotation and magnetic activity. The transient emission frequency is thought to be proportional to the local magnetic field strength: wide band 6/3 cm dynamic spectra will enable the first maps of ultracool dwarf magnetic field structures. Ultracool dwarf radio emission is not ubiquitous, and we will stack any non-detections to probe beneath the expected minimum radio luminosities from X-ray/radio correlations established for larger dwarfs. Together, these results will lead to an understanding of the unknown internal dynamo mechanism and the magnetosphere structures.

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