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Fig. 17


Keplerian fits to the corrected radial velocity measurements for the short-period (left) and long-period (right) companions. The data and fits in the left panels are corrected for the LP orbit and vice versa. The epoch of the observations is colour-coded and black symbols correspond to the best-fit model. The upper and middle panels correspond to fits with a fixed period and a changing period (for the short-period orbit), respectively. The insets give the residuals. The bottom panels show the Fourier amplitude spectra of the residuals to the initial fit for the 1920–1976 (left) and 2016 (right) data with the dash-dotted horizontal lines indicating the noise level. Vertical dashed lines give the long-period and second harmonic (left) and short-period orbital period (right), respectively. Significant signal is indicated by red arrows.

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