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2021ApJ...911...18W - Astrophys. J., 911, 18-18 (2021/April-2)

The Mega-MUSCLES spectral energy distribution of TRAPPIST-1.

WILSON D.J., FRONING C.S., DUVVURI G.M., FRANCE K., YOUNGBLOOD A., SCHNEIDER P.C., BERTA-THOMPSON Z., BROWN A., BUCCINO A.P., HAWLEY S., IRWIN J., KALTENEGGER L., KOWALSKI A., LINSKY J., LOYD R.O.P., MIGUEL Y., PINEDA J.S., REDFIELD S., ROBERGE A., RUGHEIMER S., TIAN F. and VIEYTES M.

Abstract (from CDS):

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.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): M dwarf stars - Exoplanet astronomy - Exoplanet atmospheres - Ultraviolet astronomy - X-ray astronomy - Spectral energy distribution - Spectroscopy - Stellar atmospheres

Simbad objects: 8

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