HyDRA-H: Simultaneous Hybrid Retrieval of Exoplanetary Emission Spectra

Understand

High-resolution Doppler spectroscopy has been used to detect several chemical species in exoplanetary atmospheres.

• Such detections have traditionally relied on cross correlation of observed spectra against spectral model templates, an approach that is successful for detecting chemical species but not optimised for constraining abundances.
• Recent work has explored ways to perform atmospheric retrievals on high-resolution spectra (HRS) and combine them with retrievals routinely performed for low-resolution spectra (LRS) by developing a mapping from the cross correlation function to a likelihood metric.
• We build upon previous studies and report HyDRA-H, a hybrid retrieval code for simultaneous analysis of low- and high- resolution thermal emission spectra of exoplanets in a fully Bayesian approach.