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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 7.

Posterior distribution of the bulk metallicity (Zplanet) inferred with thermal evolution models. The shaded olive region denotes the atmospheric metallicity (﹩{\mathrm{log}}[{\rm{M}}/{\rm{H}}]=-1.9﹩). The inferred bulk metallicity, much higher than the atmospheric metallicity, is incompatible with a homogeneously mixed planet.

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