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A Clearer View of HAT-P-1 b: JWST NIRSpec G395H Reveals Water, Carbon Dioxide, and Possibly Hydrogen Sulfide

  • Authors: Reza Ashtari, Stephen P. Schmidt, Guangwei Fu, Avinash Verma, David K. Sing, Kevin B. Stevenson, Jayesh Goyal, Katherine A. Bennett, Joshua D. Lothringer, Jacob Lustig-Yaeger, Sagnick Mukherjee, Carlos Gascón, Natalie H. Allen, Patrick McCreery, Le-Chris Wang, Mei Ting Mak, Kristin S. Sotzen, Lakeisha M. Ramos Rosado, N. J. Mayne

Reza Ashtari et al 2026 The Astronomical Journal 172 .

  • Provider: AAS Journals

Caption: Figure B1.

Summary of the independent SANSAR free chemistry retrieval. The upper-left panel compares the median retrieved transmission spectrum and its 1σ and 2σ credible intervals with the HST/STIS, HST/WFC3, and JWST/NIRSpec observations. The upper-right panel shows the retrieved pressure–temperature profile and credible intervals. The lower panels show the marginalized posterior distributions for the molecular VMRs; narrow posteriors are recovered for H2O, CO2, and H2S, while the remaining species are weakly constrained.

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