K2 Ultracool Dwarfs Survey – VI. White light superflares observed on an L5 dwarf and flare rates of L dwarfs
作者： R R Paudel , J E Gizis , D J Mullan , S J Schmidt , A J Burgasser
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摘要: Kepler K2 long cadence data are used to study white light flares in a sample of 45 L dwarfs. We identified 11 on 9 dwarfs with equivalent durations (1.3 - 198) hr and total (UV/optical/IR) energies $\geq$0.9 $\times$ 10$^{32}$ erg. Two superflares $>$10$^{33}$ erg were detected an L5 dwarf: this is the coolest object so far which have been identified. The larger superflare dwarf has energy 4.6$\times$ 10$^{34}$ ergs amplitude $>$300 times photospheric level: far, largest flare by $Kepler/K2$ mission. next star we was L2 2MASS J08585891+1804463. Combining all observation time dedicated $Kepler$ dwarfs, construct composite frequency distribution (FFD). FFD slope quite shallow (-0.51$\pm$0.17), consistent earlier results reported Paudel et al. (2018) for one particular L0 dwarf, found be -0.34. Using FFD, predict that, early mid-L 10$^{33}$ occurs every 2.4 years 7.9 years. Analysis our suggests that magnetic fields $\geq$0.13-1.3 kG present stellar surface: such could suppress Type II radio bursts.
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