Lily Zhao (Yale) and I looked at the (very strange; don't try this at home) problem of locating spectrograph traces in the extreme-precision spectrograph EXPRES (Fischer, PI). As my loyal reader knows, we are looking at this problem because the location of the traces in the cross-dispersion direction can be an indicator of the physical state (and hence wavelength-calibration state) of the instrument, without harming any wavelength standards. We discussed the creation and use of a matched filter for this purpose. This is amusing, because we would be locating the traces in the cross-dispersion direction the same way that the pipelines locate the stellar spectrum in the dispersion direction! If our matched filter works, we believe that we will be able to use the trace positions as an ersatz simultaneous reference for wavelelength-calibration tracking.
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