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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 8.

χ2/N grids of the mass-loss rate (﹩{\mathrm{log}}_{10}\dot{M}﹩) vs. the broadening velocity (Vbroad) for the two-visit combined dataset. The left plot shows the models with all species included, fit to the whole wavelength range. The right plot shows the Mg II-only model fit to the data between 2783 and 2818 Å.

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