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Caption: Figure 9.
The S HK portion of the joint model for HD 6061, in which GPs with some shared hyperparameters are simultaneously fit to the RVs and the Keck-HIRES S HK values. The GP kernel is described in Section 9.3. The best-fitting value of the GP period is P rot = 13.9 ± 1.5 days. See Figure 23 for the photometry and RV portions of this joint model. The GP posterior prediction is shown as the blue line surrounded by a 1σ error envelope. The Keck-HIRES S HK values are shown as the black points with 1σ errors, where the measurement error on each S HK value has been added in quadrature with the a jitter term that has been fit to the data. Residuals are shown in the bottom panel.
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