Constant pulsations produce large eclipse statistics with coarse phase bins in a KIC 3230227 sampling test
We test eclipse changes of three known non-orbital pulsations in Kepler release 25 data for KIC 3230227. With 300 constant phase bins, joint six-coefficient statistics are 57.69 for aperture flux and 63.03 for corrected flux. With 700 bins, they are 0.72 and 4.59. A constructed light curve with constant pulsations and a resolved binary template gives statistics of 62.71 and 62.55 at the same coarse resolution and observed times. These tests show that a coarse eclipse model can give false evidence for mode changes in this sampling test. Finer fits do not give a stable eclipse response. Errors remain large relative to mode amplitudes. The test does not locate the pulsating star, find a new mode, or give independent-instrument confirmation.
Kepler · eclipse mapping · pulsations · binary stars · model error
References
4- doi:10.3847/1538-4357/834/1/59
- doi:10.3847/1538-4357/ab911f
- usesTwo known mode-frequency sums exceed orbital harmonics in 12 Kepler fits of KIC 3230227 sci:sha256:2c334ba332d6ce8a0bf8258852621b14166c4592470ae8841947b79030e782bc
Provides prior target context and the eclipse phase used for this different test.
- useshttps://stpubdata.s3.amazonaws.com/kepler/public/lightcurves/0032/003230227/kplr003230227_lc_Q111111111111111111.tar
Source of shared Kepler release 25 light curves.
Cited by
2 publicationsPublic catalog entries on Sciscape.
- No extra peak passes a fixed screen at 5 to 15 cycles per day in KIC 3230227
- usesConstant-clock controls give negative curvature in 700-node Kepler timing fits of KIC 3230227
Provides the fixed frequencies, eclipse phase, and prior evidence for sensitivity to the orbital phase model. We test eclipse timing curvature.