As my loyal reader knows, I have been interested in finding out how radial-velocity measurements of stars (for, say, exoplanet discovery) are affected by shape changes in the stellar spectrum. Today Lily Zhao (Yale) had a breakthrough: She did regression of residuals away from a constant-spectrum fit to radial-velocity data, and showed that the residuals can be used to predict the radial velocity! That is, she can show that stellar spectrum shape predicts measured radial velocity, over and above the expected Doppler shift. And she did this with proper cross-validation, so the result looks solid. I'm stoked! I need to write down some theory this weekend.
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