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We describe our second installment of the 4.75 GHz survey of ultracool dwarfs(UCDs) conducted with the Arecibo radio telescope, which has observed 27 suchobjects and resulted in the detection of sporadic flaring from the T6 dwarf,WISEPC J112254.73+255021.5. We also present follow up observations of the firstradio-emitting T dwarf, 2MASS J10475385+2124234, a tentatively identified radioemitting L1 dwarf, 2MASS J1439284+192915, and the known radio-flaring source,2MASS J13142039+132011 AB. Our new data indicate that 2MASS J1439284+192915 isnot a radio flaring source. The overall detection rate of our unbiased surveyfor radio-flaring UCDs is ~5% for new sources, with a detection rate for eachspectral class of ~5-10%. Evidently, radio luminosity of the UCDs does notappear to monotonically decline with spectral type from M7 dwarfs to giantplanets, in contradiction to theories of the magnetic field generation andinternal structure of these objects. Along with other, recently publishedresults, our data exemplify the unique value of using radio surveys to revealand study properties of substellar magnetic activity.

The Second Arecibo Search for 5 GHz Radio Flares from Ultracool Dwarfs