Panchromatic Stellar Spectral Energy Distributions for HWO and ELT Target Stars

This repository contains panchromatic spectral energy distributions (SEDs) from Peacock et al. (2026), spanning the X-ray through radio for 12 nearby FGKM stars that are prioritized targets for the Habitable Worlds Observatory (HWO) and Extremely Large Telescopes (ELTs). These physically motivated stellar spectra can be reused for studies of stellar activity, exoplanet atmospheres and habitability, planetary photochemistry, and the interpretation of future observations of nearby exoplanet host stars. The SEDs were constructed by combining forward stellar atmosphere models with available archival observations across multiple wavelength regimes. The X-ray emission is modeled using APEC plasma models from Binder et al. (2024), while the UV and longer-wavelength stellar emission is modeled using PHOENIX and constrained by the Hubble Space Telescope (HST). In the UV, the PHOENIX spectra were combined with HST observations following the procedures described in Peacock et al. (2026). PHOENIX spectra were used to fill gaps between observational bandpasses and to provide a continuous spectral representation across regions without direct observations. The SEDs are provided as machine-readable FITS files. Each file contains wavelength and flux density, with the flux density scaled to the stellar surface, and is provided at both the native model resolution and a 1 A wavelength resolution. The files can be read using standard FITS-compatible software, including Python packages such as Astropy. If these data are used in a publication or other scientific work, please cite Peacock et al. (2026). Please refer to Peacock et al. (2026) for a complete description of the methods used to construct the SEDs and for the limitations and uncertainties associated with the reconstructed spectra.