James Webb Space Telescope finds 'puffball' exoplanet is uniquely lopsided

This article says that the planet is tidally locked to its star. But, how would they know what the interior rocky core is doing inside its giant "puff ball" atmosphere?

If the rocky core is spinning fast enough, I suspect it would pull some of its atmosphere away from the line to its star, similarly to the way Earth's rotation pulls ocean water away from its direct line to the Sun. So, are we looking at some sort of atmospheric tide on WASP-107b?

Other concepts, such as the atmosphere puffing on the star-lighted side, would not show up in a transit view, right?

Maybe a magnetic phenomenon between the star and an ionized atmosphere. But the spectrum should tell us how much ionization is there.

???
 

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