Fig. 4
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Astrometric PDC periodograms for a simulated system with a 100-day orbital period and a 60-day satellite rotation period. The dashed vertical line marks the simulated orbital frequency, and the dotted horizontal line corresponds to an FAP level of 10−3. An additional peak matching the period of ~30 days appears in the periodogram, and it is probably related to half the satellite rotation period.
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