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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 3.

Top: raw STIS/E230M white-light curve for KELT-9b for Visit 1 (left) and Visit 2 (right) with the fitted systematics model. Middle: systematics-subtracted light curve, fitted to the detrended data. Bottom: residuals between the detrended data and the transit model. For the first visit, we find a standard deviation of about 0.98% of the data, while for the second visit, we find residual scatter of about 0.38%.

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