Data inspection tool applied to the EB system KIC 3851949, which includes a solar-like oscillator with νmax ≈ 120 μHz and depleted ℓ = 1 modes. Left column, from top to bottom, panel a: Kepler light curves as a function of time (days), where “raw” stands for SAP and “cor” for PDCSAP. Panel b: light curves expressed in relative flux, where the blue line contains the stellar activity and oscillations (eclipses clipped out), the green line is the eclipse signal (activity filtered out), and the red curve is optimized for oscillation searches (activity and eclipses filtered out). Panel c: eclipse light curve folded on the orbital period. Panels d and e: zooms of the folded light curves around the eclipses. Right column, from top to bottom, panel f: zoom of the light curve over 20 days. Panel g: log–log scale display of the power spectral density of the time series expressed in ppm2 μHz−1 as a function of frequency (μHz). Panel h: amplitude Fourier spectrum of the time series as a function of frequency. Panel i: envelope of the autocorrelation function (EACF) as a function of frequency and time. Panel j: échelle diagram associated with the large frequency spacing automatically determined from the EACF plot. The x-axis is the frequency modulo the large frequency spacing (i.e., from 0 to Δν), and the y-axis is frequency.
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