HD 16232 spectroscopic data. On the RV periodograms, HD 16232b period is overplotted in blue. First row, from left to right: HD 16232 RV time series from K15, corresponding Lomb–Scargle and CLEAN periodograms, and window function. Overplotted on the RV is the Keplerian fit of HD 16232b we obtained with yorbit based on the K15 data (red) and the linear drift (blue). Second row: same for the RV expected from the Keplerian+linear fit of K15 data extrapolated at the epochs of our SOPHIE observations, plus added noise. Third row: same for the SOPHIE RV time series. Overplotted on the RV is the linear fit we computed with yorbit based on the SOPHIE RV (red solid line). Each RV data set (SOPHIE and K15 data) was independently centred on 0, hence the global RV offset between the two. Fourth and fifth rows: SOPHIE BIS and FWHM time series, corresponding periodograms and correlations with SOPHIE RV. Sixth row: residuals from the linear fit to the SOPHIE RV, corresponding periodograms and correlation to SOPHIE BIS.