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. 2013 Nov 4;110(48):19273–19278. doi: 10.1073/pnas.1319909110

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Fig. 5. — The fraction of stars having nearly Earth-size planets with any orbital period up to a maximum period, P, on the horizontal axis. Only planets of nearly Earth size are included. This cumulative distribution reaches 20.2% at P = 50 d, meaning 20.4% of Sun-like stars harbor a 1–2 planet with an orbital period, P < 50 d. Similarly, 26.2% of Sun-like stars harbor a 1–2 planet with a period of P < 100 d. The linear increase in this cumulative quantity corresponds to planet occurrence that is constant in equal intervals of logP. One may perform a modest extrapolation into the P = 200–400 d range, equivalent to assuming constant occurrence per logP interval, using all planets with P > 50 d. Such an extrapolation predicts that % of Sun-like stars have a planet with size 1–2 , with an orbital period between P = 200 and 400 d.

Inline graphic — The fraction of stars having nearly Earth-size planets with any orbital period up to a maximum period, P, on the horizontal axis. Only planets of nearly Earth size are included. This cumulative distribution reaches 20.2% at P = 50 d, meaning 20.4% of Sun-like stars harbor a 1–2 planet with an orbital period, P < 50 d. Similarly, 26.2% of Sun-like stars harbor a 1–2 planet with a period of P < 100 d. The linear increase in this cumulative quantity corresponds to planet occurrence that is constant in equal intervals of logP. One may perform a modest extrapolation into the P = 200–400 d range, equivalent to assuming constant occurrence per logP interval, using all planets with P > 50 d. Such an extrapolation predicts that % of Sun-like stars have a planet with size 1–2 , with an orbital period between P = 200 and 400 d.