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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 8.

Thermal evolution of TOI-5205b assuming that the bulk metallicity equals the (i) inferred value and its uncertainty derived with planetsynth (purple) or (ii) median atmospheric metallicity measured using JWST data (dashed olive). The gray error bars show the measurement values and their uncertainties. Note that, unlike the radius, we consider each planetary age shown as equally likely. The cooling curves demonstrate that the planet must be metal rich and inhomogeneous.

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