Abstract
We have conducted a mini-survey for low-frequency radio emission from some of the closest brown dwarfs to the Sun with rapid rotation rates: SIMP J013656.5+093347, WISEPC J150649.97+702736.0, and WISEPA J174124.26+255319.5. We have placed robust 3-sigma upper limits on the flux density in the 111 - 169 MHz frequency range for these targets: WISE 1506: < 0.72 mJy; WISE 1741: < 0.87 mJy; SIMP 0136: < 0.66 mJy. At 8 hours of integration per target to achieve these limits, we find that systematic and detailed study of this class of object at LOFAR frequencies will require a substantial dedication of resources.
Highlights
With effective temperatures ranging from 2400 K to below 400 K, the atmospheres of ultracool dwarfs (UCDs) link the stellar and planetary regimes
A key aim of these observations was to assess whether the low detection rate of brown dwarfs at GHz frequencies was due to local magnetic field strengths being sufficiently low to restrict electron cyclotron maser instability (ECMI) emission to the 100 MHz frequency regime
We have performed a limited search for low-frequency radio emission from some of the nearest rapidly rotating brown dwarfs to the Sun
Summary
With effective temperatures ranging from 2400 K to below 400 K, the atmospheres of ultracool dwarfs (UCDs) link the stellar and planetary regimes. Brown dwarfs of planetary mass (a few MJupiter) have been found across the L, T and Y dwarf spectral classes at a variety of ages and temperatures (e.g. Burgasser et al 2010; Burningham et al 2011; Cushing et al 2011; Delorme et al 2013; Faherty et al 2013; Liu et al 2013; Naud et al 2014).
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