Using high-resolution spectroscopy, the molecular bands in the spectrum of exoplanet atmosphere are resolved into individual absorption/emission lines. The variation of Doppler shifts caused by its orbital motion enables absorption/emission lines in the exoplanet spectrum to be distinguished from telluric lines and ensures the unambiguous detection of specific atoms/molecules. Here, we propose to observe KELT-20 b, one of the coldest ultra-hot Jupiter orbiting a bright A2V-type star using IRD to obtain its NIR transmission spectra. The purpose of the program is to understand the energy budget of the planet by searching for NIR coolant agents (e.g. H2O, HCN, CH4, CO), and constraining their abundances. Combining the both the publicly available optical data and this new NIR transmission spectrum will allow us to have a complete view on the energy budget of the planet as a whole. This would be an excellent opportunity to also demonstrate the performance of IRD in characterising the atmosphere of an exoplanet which will be valuable feedback to the instrument scientist in designing the next generation exoplanet-dedicated instrument.
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