Possible Detection of a Flare-associated Coronal Mass Ejection on an M-dwarf

Abstract

We here report a probable detection of a stellar coronal mass ejection (CME) in active M dwarf KIC 8093473 by performing an analysis on its time resolved X-ray spectra observed by the XMM-Newton satellite. Compared to the value at the quiescent state and the interstellar one, our spectral modeling returns a marginal (and probably evolving) excess of hydrogen column density in the flare state at a significance level of 1σ, which can be understood by an additional absorption due to a flare-associate CME. The CME mass is then estimated to be ~7 × 10¹⁸-2 × 10²⁰ g according to the ice cream cone model.