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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 1.

Top: program-level coadded HST/STIS/E230M spectrum of host star KELT-9. Middle: same as above, but zoomed in on the Mg II doublet at 2796.35 and 2803.53 Å and an Mg I line at 2853.00 Å. Bottom: same as above, but zoomed in on Fe II lines at 2344.25, 2382.80, 2586.69, and 2600.21 Å.

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