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For a planet which has a temperature gradient, hot in the center and cooler on the surface, why do we see absorption lines? The hot center sends photons within the black body spectrum with appropriate energies to excite surface cold atoms ,so the black body curve will have holes, where energy of the photons has been absorbed in exciting surface ...


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Well...there are several possible things which look a little strange with your question, but in general, emission occurs in hot regions and absorption occurs in cold. So, your "planet" could be emitting (presumably thermally, unless it's actually a star...) from the center and that blackbody spectrum is being absorbed by the cooler atmosphere. This is ...



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