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A High-resolution Near-Ultraviolet Transmission Spectrum of KELT-9b: Mg II and Fe II Escaping from the Hottest Known Giant Planet

  • Authors: Austin Baldwin, Joshua D. Lothringer, Leonardo A. dos Santos, David K. Sing, Zafar Rustamkulov, Nikolay K. Nikolov, Jeff Valenti, Hannah R. Wakeford

Austin Baldwin et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 9.

Comparison between the Hα observations of F. Yan & T. Henning (2018), their Gaussian fit to the line, and the extrapolation of our best-fitting models to optical wavelengths. While the best-fit mass-loss rate of 1012.5 g s−1 to the Mg II line fits the depth of the Hα line well, it requires a much narrower line with Vbroad ≈ 0 km s−1.

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