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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.