Fig. 10.

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The relation between photometric range R and rotational period for both non-KOIs (blue) and KOIs (red circles) in our sample. The black line indicates the relationship posited by Hartman et al. (2009). The observed rotation-activity relation appears to have a break corresponding to periods of around P = 12 ± 2 d, illustrated by the dotted vertical line. Solar analogs with periods shorter than ~12 d display a weak correlation with rotational period, but those with longer periods show pronounced scatter. This break is emphasized by the blue solid line, corresponding to the mean values of log R for bins of 0.1 dex in log P (non-KOI targets only). The rectangle illustrates the position of the Sun on the diagram, with its size encoding uncertainties in the solar values derived from Virgo data as part of this work.

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