Fig. 3
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Impact of the instrumental offsets: the case of HD 142A. Top: fit (blue curve; genetic algorithm; see GitHub for the MCMC fits) of the RV with the instrumental offset between the two HARPS datasets taken as a free parameter. We use red for AAT, green for HARPS pre-upgrade, and blue for HARPS post-upgrade. Middle: fit of the RV data assuming an instrumental offset of 14.9 m s−1 between the two HARPS datasets. We use red for AAT and green for HARPS. Bottom: fit of all the RV data available. We use red for AAT, green for HARPS pre-upgrade, blue for HARPS post-upgrade, and cyan for MIKE.
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