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- [ONLINE] P31I-VR8834: Observable signatures of magma-atmosphere interactions in sub-Neptunes (invited)
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Matthew Nixon, University of Maryland College Park (First Author, Presenting Author)
Jegug Ih, Space Telescope Science Institute
Sander Somers, University of Maryland College Park
Eliza Kempton, Grinnell College
Arjun Savel, University of Maryland College Park
Edward Young, University of California Los Angeles
Hilke Schlichting, University of California Los Angeles
Tim Lichtenberg, University of Oxford
Luis Welbanks, Arizona State University
Anjali Piette, Carnegie Institution for Science
Nicholas Wogan, NASA Ames Research Center
Will Misener, Carnegie Institution for Science Washington
Planets between Earth and Neptune in size, particularly those with substantial atmospheres, are expected to possess global oceans of molten rock. This molten rock interacts with the atmosphere and can change its chemical composition. While this effect has been modelled in the past, most studies have focused on the composition of the deep atmosphere, rather than the upper atmosphere which can be observed with space telescopes such as JWST.In this talk, we present models that connect interactions between molten rock and the deep atmosphere to the chemical composition of the upper atmosphere. We compare our findings to recent atmospheric observations of exoplanets. In particular, we find that JWST observations of the exoplanet TOI-270 d can be explained as the outcome of interactions between the atmosphere and the molten core and mantle. We discuss the implications of this finding, as well as the further modelling improvements that will be required to fully understand the impact of these processes on atmospheres of the broader exoplanet population.
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