S20A0019abst
S20A0019
Methane and ammonia are considered as the most fundamental molecules in cool or warm gaseous planetary atmosphere and represent the degree of the chemical non-equilibrium state. However, there is no concrete detection of methane/ammonia by HST and Spitzer yet. The recent successful detections by high-resolution spectroscopy (HRS) with the cross-correlation method have revealed the presence of CO (Snellen+10, Brogi+2012, etc.), H2O (Birkby+13, etc.), TiO (Nugroho+17), and some metal/ions (Hoeijmakers+18) in hot Jupiters. In this proposal, we aim to detect the methane, ammonia, and the tracers of photochemistry in a Neptune-sized transiting planet for the first time using the HRS technique, which will reveal the fundamental processes which governs warm Neptune atmosphere and will extend the HRS technique to sub-Jovian-sized planets.
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