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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 1.

Mass–radius diagram of known exoplanets together with model curves taken from A. Aguichine et al. (2021) and L. Zeng et al. (2019). Exoplanet data shown with colored dots were taken from the NASA Exoplanet Archive (J. L. Christiansen et al. 2025) on 2026 April 2. The transiting exoplanets in the HD 191939 system are highlighted with larger markers, error bars, and a red outline.

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