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Caption: Figure 5.
Lomb–Scargle periodogram of the residuals from the TrES-1 b RV model fit (see Figure 3). The x-axis displays frequencies in units of days−1 and the corresponding periods are shown on the top axis. The frequency range was selected by restricting the periods to between 1000 and 4300 days, the latter corresponding to the duration of the RV observation baseline. Labeled peaks indicate potentially significant periodic signals with periods of 3567, 1788, 1383, and 1194 days, suggesting possible planetary companions. These peaks informed subsequent RV fits to investigate evidence for a second planet in the TrES-1 system.
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