Chemical composition of extrasolar giant planets

Details Chemical composition of extrasolar giant planets Chemical composition of extrasolar giant planets

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..645l&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.645

Computer Science

Scientific paper

We have developed detailed photochemical models to characterize the atmospheric composition of extrasolar giant planets and applied them to the planets HD 209458 b, HD 189733 b and GJ 436 b. The first two planets are gas giants orbiting G and K type stars, respectively, while GJ436 b is a Neptune-type planet orbiting anMdwarf. Our models are able to simulate the chemical processes from deep inside the planet's troposphere, where thermochemical equilibriumprevails, up to the thermosphere where the impacts of stellar radiation and atmospheric escape have an important contribution. We present results for the impact of the stellar type spectrum in the resulting composition of each planet and discuss the role of the stellar Ly-a emission in the overall photochemistry.

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