at Stars & Exoplanets meeting today, Debra Fischer (Yale) and Ryan Petersburg (Yale) came in to tell us about the EXPRES instrument for extreme precision radial-velocity and the Hundred Earths long-term observing project. Fischer talked about how they do their RV analysis in spectral chunks, and the issue (and maybe the issue of EPRV in general) is how to combine those chunks, such that the most informative chunks get the most weight but such that the outliers get captured. In the discussion we also discussed micro-tellurics which might need to be modeled or masked. Petersburg discussed the question of how you define signal-to-noise ratio for a spectrum. It's not a well-posed problem! But it matters, because the contemporary instruments expose until they hit some SNR threshold.
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