Webb Telescope observations reveal water vapor near a distant exoplanet—but could the signal actually be coming from the star?
. These so-called “starspots” can be a red herring for those hunting water in the cosmos.
“We didn’t observe evidence of the planet crossing any starspots during the transits. But that doesn’t mean that there aren’t spots elsewhere on the star. And that’s exactly the physical scenario that would imprint this water signal into the data and could wind up looking like a planetary atmosphere,” said
Ryan MacDonald, an astrophysicist at the University of Michigan and a co-author of the research, in the
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