Extrasolar planets orbiting M dwarfs may represent our best chance to discover habitable worlds in the coming decade. The ultraviolet spectrum incident upon both Earth-like and Jovian planets is critically important for proper modeling of their atmospheric heating and chemistry. In order to provide a more realistic input for atmospheric models of planets orbiting low-mass stars, MUSCLES acquired ultraviolet and X-ray observations of 8 M dwarf and 4 K dwarf exoplanet host stars using the Hubble Space Telescope, the Chandra X-ray Observatory, and XMM-Newton. For all the stars, we have assembled panchromatic 5 A – 5.5 micron spectral energy distributions (SEDs), available for download on MAST. Mega-MUSCLES will similarly obtain panchromatic light curves and spectra of 13 M dwarfs that probe a range of stellar and exoplanet properties, with a particular focus on stars <0.3 Msolar and with a range of rotation periods that can be used as proxies for M dwarf planet hosts after Hubble’s lifetime.
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Semi-Empirical Synthetic Models: