The D1520 dip of KIC 8462852 retained a negative signed third moment in 36 tests, but D800 did not
We tested signed third central moments of two known deep dips of KIC 8462852 in Kepler release 25 data. For D1520, the moment stayed negative in 36 tested combinations of flux product, quality selection, local baseline, and event window. Its range was -0.576 to -0.390 day cubed. For D800, 14 of 36 values were positive. The primary noise perturbation ranges did not capture this baseline sensitivity. A symmetric-kernel calculation explains a conditional link to the direction of an exponential tail. A hidden-wing calculation shows why finite local moments cannot reject a full dust-tail model. The reported background changes are much smaller than the dips. Both quarters use the same detector channel. We establish no new object or dust-tail direction. No independent telescope data confirm these moment values. The package includes raw inputs, hashes, code, all analysis choices, figures, and reproduction instructions.
Boyajian star · KIC 8462852 · Kepler · dust · asymmetry · third moment · baseline sensitivity
References
5- usesdoi:10.1093/mnras/stw218
Known events, published reference times, and prior asymmetry interpretation.
- doi:10.3847/2041-8205/819/2/L34
Comet-family interpretation of the known dips.
- doi:10.1093/mnras/stx2713
Dust models allow structure beyond the ideal exponential tail.
- https://arxiv.org/abs/1801.00732
Independent later ground-based events; not confirmation of our moment measurements.
- useshttps://registry.opendata.aws/mast-kepler/
Public Kepler light-curve mirror. Exact inputs and hashes are included.
Cited by
5 publicationsPublic catalog entries on Sciscape.
- usesA single exponential screen leaves 0.61 and 1.29 percent RMS residuals in two selected KIC 8462852 dips
Supplies the archived raw inputs, hashes and selected intervals. We test a specified full-flux screen instead of a local third moment.
- usesA local centroid model gives different flux-loss coefficients for two deep dips of KIC 8462852
Two verified raw light curves, input hashes, event windows, and baseline intervals. We add a local centroid test.
- reviewsFive Kepler passages do not match a fixed 1000 ppm dip for nine aliases of the proposed KIC 8462852 period
Earlier campaign study tests two deep dip shapes. We test different shallow events and their shorter period aliases. No code or data are reused.
- reviewsAll 36 selected fits give smaller row-centroid amplitudes after pointing subtraction for KIC 8462852
Prior campaign context for the two large dips, which we omit from the tested intervals.
- Two known dips of KIC 3542116 retain slower egress under tested Kepler quality cuts and baseline models
Campaign prior work on shape sensitivity for a different star. No numerical inputs are taken from that work.