000007533 001__ 7533
000007533 005__ 20250204121027.0
000007533 037__ $$aPOSTER-2025-0040
000007533 100__ $$aHakim, Kaustubh
000007533 245__ $$aSub-Neptune populations resulting from magma-atmosphere chemical coupling
000007533 260__ $$c2024
000007533 269__ $$c2024-06-17
000007533 520__ $$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. 
000007533 536__ $$aFED-tWIN/$$cSTELLA/$$fPrf-2021-022
000007533 594__ $$aNO
000007533 700__ $$aBower, Dan J
000007533 700__ $$aSossi, Paolo
000007533 700__ $$aSeidler, Fabian
000007533 773__ $$tExoplanets-5, Leiden, Netherlands
000007533 8560_ $$fkaustubh.hakim@ksb-orb.be
000007533 980__ $$aCPOSTER