Lomb-Scargle power spectrum and signal detection efficiency spectrum. Panel a: Lomb-Scargle power spectrum of the raw PDCSAP Kepler light curve that shows stellar (and possibly systematic) activity mostly at periods of between about 10 d and 50 d. The peak at roughly 22 d might correspond to the stellar rotation period. Panel b: the activity has been removed from the light curve, which was detrended with a running biweight filter. Panel c: signal detection efficiency spectrum produced with the TLS algorithm reveals a new candidate transit signal at a period of about 378 d.
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