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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 4.

Same as Figure 3, but for two 1 Å wide bins from Visit 1, centered at 2700.2 Å (left) and 2802.4 Å, respectively, outside and inside the Mg II planetary absorption. Observe that on the second plot, the overall flux is nearly half as bright due to absorption from the host star.

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