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September 12, 2019 @ 4:00 pm - 5:00 pm CDT

Current Research in EEPS Seminar: Dr. Laura Schaefer – Stanford University

 Atmosphere-Mantle feedbacks: importance of mantle oxidation state

The oxidation state of a rocky planet’s mantle has a strong influence on the composition of secondary atmospheres formed through outgassing. Understanding how mantle oxidation state depends on planetary bulk composition and how it changes with time due to planetary differentiation, atmospheric outgassing, and interactions with a planet’s volatile envelope is crucial to accurately predicting atmospheric compositions of rocky exoplanets. Distinguishing biosignature gases from geosignatures (false positive biosignatures produced by natural geological processes) will depend on understanding the geological processes operating on planets of different size and composition compared to the Earth. In this talk, I discuss models that explore how bulk composition, atmospheric escape and planetary differentiation (metal-silicate separation) influence mantle oxidation state and the resulting outgassed atmosphere. These and future models can help select the best exoplanetary targets for detailed characterization by future telescopes like the James Webb Space Telescope (JWST) by identifying planets with lower chances for producing false positive biosignatures.

Details

Date:
September 12, 2019
Time:
4:00 pm - 5:00 pm CDT
Event Category:

Venue

Keith Weiss Geological Laboratories – Room 100
6100 Main Street
Houston, TX 77251-1892 United States
+ Google Map
Phone:
713.348.4880
Website:
www.earthscience.rice.edu

Details

Date:
September 12, 2019
Time:
4:00 pm - 5:00 pm CDT
Event Category:

Venue

Keith Weiss Geological Laboratories – Room 100
6100 Main Street
Houston, TX 77251-1892 United States
+ Google Map
Phone:
713.348.4880
Website:
www.earthscience.rice.edu

For outside visitors, the best way to get to our department is to come in on Rice Blvd and turn left into entrance 20 (intersection of Rice and Kent St.). At the stop sign, you will see a visitor parking lot on your right.  From there, walk east to the department.  The google map below shows exactly where our building is.