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Trappist 1 is an ultra cool red dwarf of about 0.09 solar masses, just a bit over the minimum for a proton-proton reaction, and a surface temperature of about 2500K.
Since this is a red dwarf, it can have the tendency to flare frequently. Not being a physicist or cosmologist (I’m just an engineer), I suspect that low mass stars that are fully convective may also tend to do a good amount of flaring.
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