Mon. Not. R. Astron. Soc., 486, 1438-1447 (2019/June-2)
K2 Ultracool Dwarfs Survey - V. High superflare rates on rapidly rotating late-M dwarfs.
PAUDEL R.R., GIZIS J.E., MULLAN D.J., SCHMIDT S.J., BURGASSER A.J., WILLIAMS P.K.G., YOUNGBLOOD A. and STASSUN K.G.
Abstract (from CDS):
We observed strong superflares (defined as flares with energy in excess of 1033 erg) on three late-M dwarfs: 2MASS J08315742+2042213 (hereafter 2M0831+2042; M7 V), 2MASS J08371832+2050349 (hereafter 2M0837+2050; M8 V), and 2MASS J08312608+2244586 (hereafter 2M0831+2244; M9 V). 2M0831+2042 and 2M0837+2050 are members of the young (∼700 Myr) open cluster Praesepe. The strong superflare on 2M0831+2042 has an equivalent duration (ED) of 13.7 h and an estimated energy of 1.3 x 1035 erg. We observed five superflares on 2M0837+2050, on which the strongest superflare has an ED of 46.4 h and an estimated energy of 3.5 x 1035 erg. This energy is larger by 2.7 orders of magnitude than the largest flare observed on the older (7.6 Gyr) planet-hosting M8 dwarf TRAPPIST-1. Furthermore, we also observed five superflares on 2M0831+2244 which is probably a field star. The estimated energy of the strongest superflare on 2M0831+2244 is 6.1 x 1034 erg. 2M0831+2042, 2M0837+2050, and 2M0831+2244 have rotation periods of 0.556 ± 0.002, 0.193 ± 0.000, and 0.292 ± 0.001 d, respectively, which we measured by using K2 light curves. We compare the flares of younger targets with those of TRAPPIST-1 and discuss the possible impacts of such flares on planets in the habitable zone of late-M dwarfs.
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
stars: activity - stars: flare - stars: individual: ((2MASS J08371832+2050349, 2MASS J08315742+2042213, 2MASS J08312608+2244586, TRAPPIST-1)) - stars: low-mass
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