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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 11.

Lomb–Scargle periodograms of the binned daily photometry. We also display the corresponding 1% false-alarm probability (FAP) levels in the BVRI bands and an estimated upper limit of HD 191939 A’s rotational period from ﹩v\sin i=(1.6\pm 0.3)\,\,{{\rm{km s}}}^{-1}\,﹩ (J. Lubin et al. 2024).

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