Keck/KPF high-resolution emission spectroscopic observations of the ultrahot Jupiter KELT-9 b

This repository contains phase-resolved emission spectra of KELT-9 b observed with the optical high-resolution spectrometer Keck/KPF (R~98,000). The `KELT9_*_residual.h5` files contain the residual time-series data after telluric and stellar removal. The `KELT9b_*_line_w6565.h5` files are similar but only include the two spectral orders near the H-alpha line. The `KELT9b_w6565_avg_p0.30-0.45.dat` is the phase-averaged H-alpha emission spectrum of KELT-9 b. The relavant results are published in Zhang et al. (2026a,b).