Simultaneous optical and X-ray observations of a giant flare on the ultracool dwarf LP 412-31
Simultaneous optical and X-ray observations of a giant flare on the ultracool dwarf LP 412-31
Cool stars are known to produce flares probably as a result of the magnetic reconnection in their outer atmospheres. We present simultaneous XMM-Newton optical V band and X-ray observations of the M8 dwarf LP 412-31. During the observation a giant flare occurred, with an optical amplitude of 6 mag and …