Impact of CO2 on water outgassing on rocky planets around TRAPPIST-1 – VPLANET/MagmOcV2.0
- 1Austrian Acadamy of Sciences, Space Research Institute, Austria (ludmila.carone@oeaw.ac.at)
- 2University of Washington, Department of Astronomy
- 3Bristol University, School of Physics
- 4University College Cork, Department of Physics
VPLANET MagmOc is a versatile magma ocean model with erosion of water vapour in the open source VPLANET framework. We
present here a major improvement of this model that includes now a) thermal emission calculated with a full radiative transfer code and b) simultaneous outgasing of H2O and CO2 with full feedback on outgassing informed by planet formation models.
We derived evolution tracks of an outgassed mixed H2O/CO2 atmosphere on TRAPPIST-1e, f and g. We find that all planets, in particular TRAPPIST-1 g, run the risk to evolve into Exo-Venuses with thick CO2 atmospheres after the magma ocean stage for an intial water budget of more than 10 terrestrial ocean (TO) of water within tens of million years.
At the inner edge of the habitable zone, on TRAPPIST-1 e, we find that the combination of H2O atmosphere loss and CO2 outgassing reduces the thermal emission on the planet such that the magma ocean stage can be almost doubled from tens of million years to 80 million years for 10 TO intial water.
We thus conclude that careful consideration has to be given to the various geophysical feedback effects as these can have a profound impact on the magma ocean evolution stage and thus on the overall water budget and the secondary atmosphere.
How to cite: Carone, L., Barth, P., Barnes, R., Helling, C., Chubb, K., and Bitsch, B.: Impact of CO2 on water outgassing on rocky planets around TRAPPIST-1 – VPLANET/MagmOcV2.0, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-11513, https://doi.org/10.5194/egusphere-egu24-11513, 2024.
