Exoplanetary systems: past, present, and future
Fully-Consistent Chemical Kinetics Modeling and its Impact on the Emission Spectra of Hot Jupiters
Benjamin Drummond
University Of Exeter
I will present results from a one-dimensional (1D) atmosphere model showing the effects of consistent non-equilibrium chemistry on the pressure-temperature (PT) profile and on the simulated spectrum. The chemical composition is an important property to derive as it has implications for both the temperature structure and on the observable features. Planetary atmospheres are rarely expected to be in chemical equilibrium and processes such as mixing and photochemistry can drive the chemistry into a state of non-equilibrium. Chemical kinetics models are often used to investigate these processes, however, they typically use the PT profile as a fixed model input decoupling the chemistry from the thermal structure. Our 1D model (ATMO) couples consistently the radiative-convective balance calculations with the chemistry calculations. This allows the model atmosphere to retain radiative-convective equilibrium as the chemical abundances are driven away from chemical equilibrium. We find that this can cause temperature changes of up to 100 K in the deep atmosphere, this has important feedback effects on the temperature dependent chemistry and, most importantly, reduces the overall impact of non-equilibrium chemistry on the simulated emission spectrum. I will also summarise our current work in implementing these chemistry schemes into a 3D general circulation model to study the effect of horizontal advection of chemical species.
16:30 - 18:00
EX - LT3 (320)