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GEMS JWST: Transmission Spectroscopy of TOI-5205b Reveals Significant Stellar Contamination and a Metal-poor Atmosphere

  • Authors: Caleb I. Cañas, Jacob Lustig-Yaeger, Shang-Min Tsai, Simon Müller, Ravit Helled, Shubham Kanodia, Dana R. Louie, Giannina Guzmán Caloca, Peter Gao, Jessica Libby-Roberts, Kevin K. Hardegree-Ullman, Knicole D. Colón, Ian Czekala, Megan Delamer, Te Han, Andrea S.J. Lin, Suvrath Mahadevan, Erin M. May, Joe P. Ninan, Anjali A. A. Piette, Guðmundur Stefánsson, Kevin B. Stevenson, Johanna Teske, Nicole L. Wallack

Caleb I. Cañas et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 10.

The implicit prior (gray) and posterior distributions using results from the fits to the coadded ExoTiC-JEDI spectrum from retrievals with POSEIDON, assuming free chemistry and a clear (orange) or cloudy (red) atmosphere. Top: the posteriors for the atmospheric metallicity, [M/H]. Bottom: the posterior distributions for the C/O ratio. Chemical equilibrium retrievals tended to push the limits of their respective grids, but the free retrievals showed that the metallicity, while likely subsolar, remained dependent on the unconstrained presence of clouds. The C/O ratio is consistently supersolar and insensitive to the presence of clouds.

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