000007532 001__ 7532
000007532 005__ 20250204120816.0
000007532 037__ $$aSEMIN-2025-0023
000007532 100__ $$aHakim, Kaustubh
000007532 245__ $$aMagma-Atmosphere Coupling in Hot Sub-Neptunes
000007532 260__ $$c2024
000007532 269__ $$c2024-08-29
000007532 520__ $$aHot sub-Neptunes (equilibrium temperatures > 1000 K) are commonly found in the galaxy. Recent modelling efforts suggest that magma-atmosphere coupling of small exoplanets, i.e., rocky exoplanets and sub-Neptunes, strongly impacts the atmospheric chemistry, enriching the atmosphere in refractory element-bearing gases, e.g., SiO, SiH4. To determine atmospheric chemistry, we implement a new state-of-the-art code, atmodeller, that models an equilibrium chemistry reaction network. Based on the calculations for atmosphere chemistry in the Si-O-H system with mass conservation for H, we can classify sub-Neptune populations into steam worlds, hydrogen worlds, and silicon worlds (see figure). We will further show the strong impact of non-ideal gas behaviour and gas solubility in magma on these populations. These populations should exhibit distinct atmospheric signatures that are detectable with JWST transmission and emission spectroscopy. 
000007532 536__ $$aFED-tWIN/$$cSTELLA/$$fPrf-2021-022
000007532 594__ $$aNO
000007532 773__ $$tETH Zurich, Institute for Particle Physics and Astrophysics
000007532 8560_ $$fkaustubh.hakim@ksb-orb.be
000007532 980__ $$aSEMIN