A Cool Star Flare Reveals an Unexpectedly Hot Emission Component

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Introduction

The MUSCLES and Mega-MUSCLES Treasury Surveys are large observing programs that are using the Hubble Space Telescope, Chandra X-ray Observatory, XMM-Newton, the Neil Gehrels Swift Observatory, and a suite of ground-based optical telescopes to construct panchromatic (5 Å - 5.5 μm) spectral energy distributions for a representative sample of M dwarf stars (Refs [0],[1]). The goal of the surveys is to establish

Figure 1: During FUV observations with the Hubble Space Telescope, the M2.5V dwarf star, GJ 674, exhibited several small flares and one large flare in the last orbit.

Observations and Flare Properties

==Hydrodynamic Models and

Conclusion

References

[0] The MUSCLES Treasury Survey. I. Motivation and Overview [1] Flexing our MUSCLES: The HST Mega-MUSCLES Treasury Survey [2] The Cosmic Origins Spectrograph: on-orbit instrument performance [3] A Hot Ultraviolet Flare on the M Dwarf Star GJ 674