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The Mega-MUSCLES Spectral Energy Distribution Of TRAPPIST-1

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arxiv 2102.11415 v1 pith:ZTWWEZW7 submitted 2021-02-22 astro-ph.SR

David J. Wilson , Cynthia S. Froning , Girish M. Duvvuri , Kevin France , Allison Youngblood , P. Christian Schneider , Zachory Berta-Thompson , Alexander Brown
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Andrea P. Buccino Suzanne Hawley Jonathan Irwin Lisa Kaltenegger Adam Kowalski Jeffrey Linsky R. O. Parke Loyd Yamila Miguel J. Sebastian Pineda Seth Redfield Aki Roberge Sarah Rugheimer Feng Tian Mariela Vieytes
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We present a 5A-100um 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 Lyman alpha to EUV relations often used to estimate the 100-911A 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 semi-empirical, noise-free model of the stellar ultraviolet spectrum based on our observations for use in atmospheric modelling of the TRAPPIST-1 planets.

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Cited by 2 Pith papers

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    astro-ph.EP 2026-07 conditional novelty 6.0 of 10

    A new dimensionless ratio, ΨHALD, predicts the maximum haze particle radius that can reach a hot Jupiter's morning limb, and matches 3D climate simulations to within a factor of a few.

  2. Combined analysis of the 12.8 and 15 $\mu m$ JWST/MIRI eclipse observations of TRAPPIST-1 b

    astro-ph.EP 2024-12 conditional novelty 6.0 of 10

    Combined JWST/MIRI eclipses at 12.8 and 15 µm give depths of 452±86 and 775±90 ppm, leaving an airless ultramafic surface and a hazy CO2 atmosphere as equally viable explanations.

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