Exoplanet atmospheric research

It astounds me how much we can know about an exoplanet's atmosphere. Like:

• It's got sodium, hydrogen, oxygen and silicon
• It hasn't got water
• Estimates of its pressure and temperature
• Detection of its thermosphere (the ISS rides around in Earth's thermosphere; who knew?)
• It has a relatively clear upper atmosphere
• Its atmosphere might be being blown away by its host star
• Constraints on the strength of its magnetic field

Many, many details at the Exoclimes blog; pretty picture and more user-friendly summary of one set of observations by the Spitzer Space Telescope here.