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Caption: Figure 4.
HD 42813 (left) and HD 6061 (right) are the only two systems where the p-value of either the Spearman or Pearson test (and in their cases, both) was <0.05 for the Keck-HIRES RV residuals and S HK values. In each panel, the Keck-HIRES RVs are shown in blue and a linear least-squares fit to the data is plotted in orange. We note that for HD 42813, we removed the one observation with S HK >0.19 and refit the data, but still find p Spearman and p Pearson are both <0.05. The correlation between the RV residuals and the S HK values suggests that stellar activity might be manifesting itself in the RVs, but we emphasize that p-value testing can be unreliable (e.g., Colquhoun 2014). This test is just one point of reference in our broader investigation into stellar activity contamination in the RVs.
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