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The SPACE Program. II. No Discernible Spectral Features in the Transmission Spectrum of the Sub-Neptune HD 191939 b Observed with HST/WFC3

  • Authors: Cyril Gapp, Lorena Acuña-Aguirre, Reza Ashtari, Mario Damiano, Thomas M. Evans-Soma, David J. Wilson, Kevin France, Laura Kreidberg, Drake Deming, Qiushi Chris Tian, Seth Redfield, Ian J.M. Crossfield, K. Angelique Kahle, Tansu Daylan, Kevin Heng, Bertram Bitsch, James S. Jenkins, Keivan G. Stassun, Antonio García Muñoz, Ludmila Carone

Cyril Gapp et al 2026 The Astronomical Journal 172 .

  • Provider: AAS Journals

Caption: Figure 8.

Reconstruction of the Lyα line from the HST/STIS G140M data. All spectra were shifted to the peak of the Lyα line. Purple solid lines with error bars present the observations that show clear absorption of the Lyα peak in line with ISM absorption. The yellow solid lines show the models fit to the observations, and the ISM absorption-corrected spectrum of HD 191939 A is shown with dashed orange lines. The three versions of the reconstruction using the same data are shown in the different panels.

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