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Red Noise–based False Alarm Thresholds for Astrophysical Periodograms via Whittle’s Approximation to the Likelihood

Amna Ejaz et al 2026 The Astronomical Journal 171 .

Caption: Figure 4.

The observed Hα time series of GJ 581 (P. Robertson et al. 2014; blue) and a new realization created by adding white noise to each observation (red).