High-resolution spectroscopy reveals an aligned orbit and no atmospheric absorption in WASP-122b, suggesting observational masking or absent species.
Key Points
Hot Jupiter WASP-122b maintains an aligned spin-orbit angle with its host star, while transmission spectroscopy reveals no detectable atomic or molecular absorption.
A spin-orbit angle of λ = 0.09 deg confirms low obliquity, matching trends seen in planetary systems around host stars with temperatures cooler than 6500 K.
Assessment using the cross-correlation method across ESPRESSO high-resolution spectra found no chemical signatures, likely due to Rossiter-McLaughlin effect masking.