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Atmospheric Reconnaissance of TRAPPIST-1 f with JWST NIRISS SOSS: No Evidence for the Transit Light Source Effect

  • Authors: Olivia Lim, René Doyon, Ryan J. MacDonald, Étienne Artigau, Michael Radica, Mykhaylo Plotnykov, Alexandrine L'Heureux, Caroline Piaulet-Ghorayeb, Louis-Philippe Coulombe, David Lafrenière, Thomas J. Fauchez, Martin Turbet, Diana Valencia, Loïc Albert, Laura Flagg, Björn Benneke, Neil J. Cook, Pierre-Alexis Roy, Lisa Kaltenegger, Charles Cadieux, Nicolas B. Cowan, Michaël Gillon, Romain Allart, Lisa Dang, Doug Johnstone, Stefan Pelletier, Jared Splinter, Jake Taylor

Olivia Lim et al 2026 The Astronomical Journal 172 .

  • Provider: AAS Journals

Caption: Figure 3.

Panel (a): error-weighted average of the five TLSE-corrected SOSS transit spectra of TRAPPIST-1 f (black points). The green curve is an H2/He-dominated, 1 bar atmospheric model at solar metallicity. Green points are at the resolution of the data. Crosses are HST data (J. d. Wit et al. 2018; Z. Zhang et al. 2018). Panel (b): same SOSS spectrum as in panel (a), zoomed in, compared to pure, 1 bar atmospheric models (blue and orange), and to the Archean-Earth models from T. J. Fauchez et al. (2019; red and purple). This transit spectrum and other data products can be found on Zenodo via DOI: 10.5281/zenodo.14501417.

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