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Transcript
Properties of HD 209458 The central star is a G0V solar-type dwarf star – It is nearly edge-on, ~85 inclination Facilitates detection of the atmosphere Physical parameters: 1.54 RJ and 0.68 MJ Orbital parameters: ~0.05 AU and 3.5 days period – – – – Probably tidally locked permanent day/night high UV flux/stellar irradiance: 104 of Jupiter hot : > 1000 K Conclusions Venus: The ClC(O)OO, the key to Venus chemistry, identified. Improved chemistry can explain the low O2 of Venus Yung and DeMore (1982) vindicated Can study other reactions involving ClC(O)OO Can look for ClC(O)OO on Venus Venus, the ultimate fate of all terrestrial planets ala Ingersoll 1969 --- testable hypothesis Titan: Allene isomerization to methylacetylene most likely Yung, Allen and Pinto (1984) vindicated Can confirm by measuring the rate constant and H C3H6 most likely to be in the atmosphere Hot Jupiter Higher temperature is everything More H2O in upper atmosphere fuels hydrodynamic escape More CO than CH4 kills higher hydrocarbons and aerosols Evolution of planets by intense evaporation --proximity to central star or other heating mechanisms If you want more of this exciting stuff, please sign up for GE203 in Spring 2004.
