Benjamin V. Rackham studies how stellar surface inhomogeneity can contaminate exoplanet transmission spectra. His coauthored transit-light-source work shows that different spectra along the transit chord and across the whole star can mimic atmospheric features. This makes the illuminating star part of the inference problem.[ref]
The Transit Light Source Effect by Benjamin V. Rackham and others. author list and the described study’s abstract or introductory account
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