University of Montreal
Hydrogen-rich sub-Neptune or exposed Neptune mantle. Confirming the nature of the most favorable sub-Neptune for JWST emission spectroscopy — Following the JWST ERS and Cycle 2 GO Announcement of Opportunity published on July 6, 2023, the CSA is providing funding via a Grant Agreement to the university to conduct their research using the JWST data. 

This project will observe a uniquely hot and dense sub-Neptune exoplanet, TOI-842b, in order to determine its structure and composition. The study will determine if the exoplanet is an exposed Neptune mantle, like Neptune that lacks the large H2 envelope, as well as determine the composition and thermal structure of its atmosphere. These results will obtain one of the deepest understandings of a sub-Neptune planet yet, as well as expand the understanding of sub-Neptune formation.