Template-matching and line-by-line radial velocity pipelines show a systematic, always-negative intra-night drift (up to about 50 m/s per hour) when the stellar template is built from short-baseline data, while CCF RVs do not.
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A systematic bias in template-based RV extraction algorithms
Template-matching and line-by-line radial velocity pipelines show a systematic, always-negative intra-night drift (up to about 50 m/s per hour) when the stellar template is built from short-baseline data, while CCF RVs do not.