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Constraining Atmospheric Composition from the Outflow: Helium Observations Reveal the Fundamental Properties of Two Planets Straddling the Radius Gap

  • Authors: Michael Zhang, Jacob L. Bean, David Wilson, Girish Duvvuri, Christian Schneider, Heather A. Knutson, Fei Dai, Karen A. Collins, Cristilyn N. Watkins, Richard P. Schwarz, Khalid Barkaoui, Avi Shporer, Keith Horne, Ramotholo Sefako, Felipe Murgas, Enric Palle

Michael Zhang et al 2025 The Astronomical Journal 169 .

  • Provider: AAS Journals

Caption: Figure 6.

pyTPCI predictions for c (top) and b (bottom) at different metallicities, compared to the observational data. For c, we run one simulation with the XUV spectrum from David Wilson and another with the XUV spectrum from Jorge Sanz-Forcada. Despite the factor of 3–4 flux discrepancy in both X-rays and EUV, the resulting helium absorption is remarkably similar.

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