000007539 001__ 7539
000007539 005__ 20250204123050.0
000007539 037__ $$aCTALK-2025-0067
000007539 100__ $$aHakim, Kaustubh
000007539 245__ $$aMagma-Atmosphere Coupling of Hot Sub-Neptunes
000007539 260__ $$c2024
000007539 269__ $$c2024-10-29
000007539 520__ $$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. We model an equilibrium chemistry reaction network to simulate magma-atmosphere reactions. 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 now and with ARIEL in the future. These modelling results can help ARIEL to prioritise the target list. 
000007539 536__ $$aFED-tWIN/$$cSTELLA/$$fPrf-2021-022
000007539 594__ $$aNO
000007539 773__ $$tARIEL Consortium Meeting, Lisbon, Portugal
000007539 8560_ $$fkaustubh.hakim@ksb-orb.be
000007539 906__ $$aContributed
000007539 980__ $$aCTALKCONT