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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 .

Caption: Figure 5.

Same as Figure 4, but for two 1 Å wide bins from Visit 2, respectively, outside and inside the Mg II planetary absorption.