The paper attributes the dramatic period change in 1ES 1927+654 to von Zeipel-Lidov-Kozai oscillations driven by an unseen third star, and predicts the X-ray luminosity should scale inversely with the quasiperiod.
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The Rapidly--Changing Period of the QPE Source 1ES~1927+654
The paper attributes the dramatic period change in 1ES 1927+654 to von Zeipel-Lidov-Kozai oscillations driven by an unseen third star, and predicts the X-ray luminosity should scale inversely with the quasiperiod.