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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 6.

Best-fit sunbather model (gold, T  =  13,200 K, ﹩\dot{M}\,=\,1{0}^{11.5}﹩ g s−1, Vbroad = 50 km s−1) to the combined two-visit dataset. The best-fit model to the entire spectrum does not match the magnitude or blueshift of the Mg II absorption near 2800 Å, shown in the inset plot, which extends beyond the Roche radius (black, dashed).

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