• DOI:10.3847/1538-4357/abe771
• Corpus ID: 232014177

The Mega-MUSCLES Spectral Energy Distribution of TRAPPIST-1

@article{Wilson2021TheMS,
  title={The Mega-MUSCLES Spectral Energy Distribution of TRAPPIST-1},
  author={David J. Wilson and Cynthia S. Froning and Girish M. Duvvuri and Kevin France and Allison Youngblood and P. Christian Schneider and Zachory K. Berta-Thompson and Alexander Brown and A. P. Buccino and Suzanne L. Hawley and Jonathan M. Irwin and Lisa Kaltenegger and Adam F. Kowalski and Jeffrey L. Linsky and R. O. Parke Loyd and Yamila Miguel and J. Sebastian Pineda and Seth Redfield and Aki Roberge and Sarah Rugheimer and Feng Tian and Mariela C. Vieytes},
  journal={The Astrophysical Journal},
  year={2021},
  volume={911}
}

• David J. Wilson, C. Froning, +19 authors M. Vieytes
• Published 22 February 2021
• Physics
• The Astrophysical Journal

We present a 5 Å–100 μm spectral energy distribution (SED) of the ultracool dwarf star TRAPPIST-1, obtained as part of the Mega-MUSCLES Treasury Survey. The SED combines ultraviolet and blue-optical spectroscopy obtained with the Hubble Space Telescope, X-ray spectroscopy obtained with XMM-Newton, and models of the stellar photosphere, chromosphere, transition region, and corona. A new differential emission measure model of the unobserved extreme-ultraviolet spectrum is provided, improving on the Lyα–EUV relations often used to estimate the 100–911 Å flux from low-mass stars. We describe the observations and models used, as well as the recipe for combining them into an SED. We also provide a semiempirical, noise-free model of the stellar ultraviolet spectrum based on our observations for use in atmospheric modeling of the TRAPPIST-1 planets.