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  • ASASSN-18di: discovery of a $\Delta V \sim 10$ flare on a mid-M dwarf
    Rodríguez, Romy; Schmidt, Sarah J; Jayasinghe, Tharindu; Stanek, Krzysztof Z; Prieto, Jose L; Shappee, Benjamin; Kochanek, Chris S; Thompson, Todd A; Shields, Joshua; Holoien, Tom W. -S; Bersier, David; Brimacombe, Joe

    04/2018
    Journal Article

    We report and characterize a white-light superflare on a previously undiscovered M dwarf detected by the ASAS-SN survey. Employing various color-magnitude and color-spectral type relationships, we estimate several stellar parameters, including the quiescent V-band magnitude, from which we derive a flare amplitude of $\Delta V \sim 10$. We determine an r-band absolute magnitude of $M_{r} = 11.4$, consistent with a mid-M dwarf, and an approximate distance to the source of $2.2$ kpc. Using classical-flare models, we infer a flare energy of $E_{V} \simeq (4.1\pm 2.2)\times 10^{36}$ ergs, making this one of the strongest flares documented on an M dwarf.

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