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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 7.

Top: converged temperature profile of the best-fit Cloudy model to the Mg II feature, which had an input temperature of 13,200 K and a mass-loss rate of 1012.5 g s−1. Bottom: heating (red) and cooling rates (blue) of the above model from radiation, expansion, and advection. The gray dashed–dotted line represents the location of the Roche radius.

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