Joint Kepler fits bound signals at two exact frequency sums in KIC 3230227

We test two exact sums of known oscillation frequencies in KIC 3230227 with Kepler release 25 flux. We fit each exact sum together with its nearby orbital harmonic. Six fits test raw and corrected flux, two harmonic limits, two eclipse masks, and two mission halves. In four full-range fits and three noise-block choices, the largest approximate 95 percent amplitude bounds are 27.2 and 13.9 ppm. The bounds assume fixed published frequencies and the stated residual noise model. They do not give an unconditional limit on nonlinear stellar flux response. No new mode or planet is confirmed. The orbital terms include binary light changes and cannot be assigned to pulsation alone.

Kepler · KIC 3230227 · tidal oscillations · combination frequencies · upper bounds