000007537 001__ 7537
000007537 005__ 20250204122739.0
000007537 037__ $$aCTALK-2025-0065
000007537 100__ $$aHakim, Kaustubh
000007537 245__ $$aImpact of Magma-Atmosphere Coupling on Sub-Neptune Populations
000007537 260__ $$c2024
000007537 269__ $$c2024-07-10
000007537 520__ $$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. 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.
000007537 536__ $$aFED-tWIN/$$cSTELLA/$$fPrf-2021-022
000007537 594__ $$aNO
000007537 773__ $$tCOST PLANETS Kick-Off Meeting, Torun, Poland
000007537 8560_ $$fkaustubh.hakim@ksb-orb.be
000007537 906__ $$aContributed
000007537 980__ $$aCTALKCONT