Date: Monday 16-Sep-2024
Time: 11:15 am - 12:15 pm
Location: ATL 1250 and Zoom (contact host Matt Nixon for link)
Speaker: Jeehyun Yang (NASA JPL)
Title: Cross-Disciplinary Characterization of Exoplanet Atmospheres: Observation, Theory, and Experiment
Abstract: With JWST’s arrival, the demand for detailed chemical models of exoplanet atmospheres has surged. We introduce an automated approach using a chemical network generator integrated with 1D photochemical modeling, applied to atmospheres from hot Jupiters to temperate sub-Neptunes. Our framework reveals that the CO2/CH4 ratio can indicate a planet's deep interior H2O/H2 ratio. For K2-18 b, we estimate a 50% water-rich interior, while TOI-270 d shows 25% water, consistent with high metallicity. Carbonyl sulfide (OCS) and sulfur dioxide (SO2) emerge as key indicators for water-rich sub-Neptunes. Future research will explore sulfur chemistry through ab-initio and experimental approaches.
If you have any questions, contact the PALS hosts: Benjamin Sharkey (small bodies) and Matt Nixon (exoplanets).
SPECIAL ACCOMMODATIONS:Special accommodations for individuals with disabilities can be made by calling (301) 405-3001. It would be appreciated if we are notified at least one week in advance.
ATL 1250 is a flat, carpeted conference room that can accommodate approximately 20-30 people at large tables. The closest wheelchair accessible entry to this room in the Atlantic building is the white stone entrance at 224 Stadium Drive.
