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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 5.

Maximum a posteriori retrieved transmission spectrum (black line) with the contributions, derived using POSEIDON, shown from stellar contamination (red line) and atmospheric opacity (blue line). The contributions from individual atmospheric species are shown with various colors (see legend). The transmission spectrum of TOI-5205b is characterized by strong stellar contamination throughout much of the 0.6–3.5 μm wavelength range, with evident absorption from the planetary atmosphere due to CH4 and H2S. No other molecular species were significantly detected in our retrievals (see Table 4).

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