Influence of different parameters on the chemical composition of warm neptunes

TL;DR

This paper introduces a novel 1D photo-thermochemical model, validated across a wide temperature and pressure range, to analyze how various parameters influence the atmospheric composition of warm Neptunes.

Contribution

A new chemical scheme developed with combustion experts, validated experimentally, enabling detailed study of warm Neptune atmospheres.

Findings

Chemical composition varies with vertical mixing and metallicity.

Model successfully applied to GJ3470b and GJ436b.

Results highlight parameter impacts on atmospheric chemistry.

Abstract

We developed a 1D photo-thermochemical model to study the atmosphere of warm exoplanets. The chemical scheme used in this model is completely new in planetology and has been constructed in collaboration with specialists of combustion. It has been validated as a whole through experiments on a large range of temperature (300 - 2500 K) and pressure (1 mbar - 100 bar), allowing to study a wide variety of exoplanets. We have used this chemical model to study the atmosphere of two warm Neptunes, GJ3470b and GJ436b, and the influence of different parameters (vertical mixing, metallicity, temperature, . . . ) on their chemical composition. We present here the results obtained in these studies.