000007538 001__ 7538
000007538 005__ 20250204122930.0
000007538 037__ $$aCTALK-2025-0066
000007538 100__ $$aHakim, Kaustubh
000007538 245__ $$aMagma-Atmosphere Coupling of Sub-Neptune Exoplanets
000007538 260__ $$c2024
000007538 269__ $$c2024-09-12
000007538 520__ $$aAtmospheres of hot sub-Neptunes (equilibrium temperatures > 1000 K) are being characterised by the James Webb Space Telescope (JWST). Recent modelling efforts suggest that the magma-atmosphere coupling of hot sub-Neptunes strongly impacts their 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 between the atmosphere and the interior, we can classify sub-Neptune populations into steam worlds, hydrogen worlds, and silicon worlds. We quantify the strong impact of including 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.
000007538 536__ $$aFED-tWIN/$$cSTELLA/$$fPrf-2021-022
000007538 594__ $$aNO
000007538 700__ $$aBower, Dan J. 
000007538 700__ $$aSossi, Paolo
000007538 700__ $$aSeidler, Fabian 
000007538 773__ $$tGeologica Belgica, Liege, Belgium
000007538 8560_ $$fkaustubh.hakim@ksb-orb.be
000007538 906__ $$aContributed
000007538 980__ $$aCTALKCONT