High-Frequency Properties of Ultracool Dwarf Star Radio Transients, or The Little Dwarfs that Could

Details High-Frequency Properties of Ultracool Dwarf Star Radio Transients, or The Little Dwarfs that Could High-Frequency Properties of Ultracool Dwarf Star Radio Transients, or The Little Dwarfs that Could

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.2480r&link_type=abstract

ATNF proposal C2114, Semester: July, 2009

Astronomy and Astrophysics

Astronomy

Stellar, Atca

Scientific paper

Radio transients are among the most intriguing phenomena in astronomy. Numerous flaring events, some periodic, have lately surfaced, with only few identified with known objects such as magnetic stars. Periodic, non-thermal, highly circularly-polarised pulses and unusually strong quiescence have been recently detected from three late-type quickly-rotating (~2hr periods) ultracool dwarf stars (>M7) at centimetric wavelengths. This violates empirical relations and quantifiers of dwarf-star surface activity. Measurements of dwarf-star kiloGauss magnetic fields have led to emission models based on dipole fields and incoherent gyrosynchrotron or coherent electron-cyclotron maser mechanisms. We propose to observe two such similar objects at 1cm and 7mm (LP944-20 and DENIS1048-3956) that are known to flare but without detected periodicities. No observations of high-frequency emission from any magnetic star have been published. The broadband capabilities of CABB will provide extraordinary frequency-synthesised sensitivity in a search for periodicity. The obtained spectral indices, along with possible high-frequency spectral cut-offs, will greatly help constrain emission models of magnetic stars. This is the first attempt to characterise the high-frequency transient radio sky, a key science project for future telescopes such as ASKAP and the SKA.

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