A hierarchical calibration corrects wavelength-dependent and global RV systematics in LAMOST DR9, halving repeat-observation dispersion to 1.8 km/s and approaching the R~1800 theoretical limit.
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A General Framework for Radial Velocity Calibration in Low-Resolution Spectroscopic Surveys: Correcting Wavelength-Dependent and Global Systematics with Application to LAMOST DR9
A hierarchical calibration corrects wavelength-dependent and global RV systematics in LAMOST DR9, halving repeat-observation dispersion to 1.8 km/s and approaching the R~1800 theoretical limit.