Synthetic Absoprtion profiles for HD209458b

Normalized transmission as a function of velocity for gas in front of the stellar surface. The y-axis shows the time and there is a faint band from t=5 to t=7 hours that correspond to the time when the planet itself is in front of the star. The velocity is the projection of the gas velocity towards the camera - so positive velocities should correspond to shorter wavelengths and higher frequencies. The shifting to higher velocities at early times I believe can be attributed to the gas emitted from the day side that gets swept out in front of the planet and then gets accelerated outward by the stellar wind.

(Note the earlier version of this plot had the velocity scale incorrectly going from -300 to 300 km/s)

And here is a movie showing the emission at the center wavelength

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