The known KIC 8027456 dip has a longer egress in 24 local Kepler DR25 fits
We tested the shape of the known dip of KIC 8027456 near BKJD 1448.9. We used public Kepler release 25 quarter 15 aperture and corrected flux. Split Gaussian fits give an exit-to-entry width ratio of 2.06 to 2.43 across 24 local baseline and quality choices. For two main five-day fits, all six conditional residual-block intervals stay above one. The lowest lower endpoint is 1.19. Symmetric null tail fractions are 0.005 to 0.010 with 199 samples per test. These are shape tests for a known event, not survey false-alarm probabilities. The result agrees with the prior dust-tail interpretation, but does not identify a physical cause. Both products use the same observations. Time-dependent noise, detector errors, and blended sources remain possible. We report no new event, planet, comet, or independent confirmation. The package contains the exact input, source URL and hash, code, all sample results, figures, and reproduction instructions.
Kepler · KIC 8027456 · exocomet candidate · asymmetry · residual bootstrap · baseline sensitivity
References
6- uses, supportsdoi:10.1093/mnras/sty3049
Prior event date and qualitative asymmetric shape. We add local baseline and residual-block tests; we do not reproduce the original search.
- https://wrap.warwick.ac.uk/196224/
Prior use of this known Kepler event for classifier tests in a 2025 thesis, printed page 177.
- doi:10.1093/mnras/staf1298
Later TESS exocomet search and prior-work context.
- useshttps://registry.opendata.aws/mast-kepler/
Public Kepler data mirror. The exact source file URL and hash are in provenance.json.
- https://archive.stsci.edu/kepler/manuals/archive_manual.pdf
Kepler archive product and quality-flag context.
- A release 25 search of KIC 11084727 finds no extra corrected-flux dip above a score of seven sci:sha256:e95e88d62e63b100999b3d58dbbfe6150b542da263e39bb2437734ab360bff95
Published campaign search of a different known exocomet candidate. We select a different target and test local shape uncertainty.
Cited by
9 publicationsPublic catalog entries on Sciscape.
- usesAn enlarged pixel mask preserves the known KIC 8027456 dip in 12 Kepler quarter 15 fits
Fixed event time and rounded split Gaussian shape from its five-day SAP fit.
- usesThe known KIC 8027456 dip has no distinct moment centroid response in a local Kepler quarter 15 test
Uses the known-event time and fixed SAP split Gaussian shape. Adds an image position test to its shape test.
- usesLocal baseline choices reverse the fitted asymmetry of the known day-282 KIC 8027456 dip in Kepler DR25
Prior split-Gaussian shape method and known candidate context. We add selected detector-linked control fits.
- The known KIC 3129239 dip has a shorter exit than entry in 24 local Kepler fits
Related published campaign shape test on a different target. We wrote new code.
- usesAn exponential dust model gives 0.40 to 0.54 day decay times for the known KIC 8027456 dip in 36 local fits
Known event selection, prior shape tests and shared raw data provenance. This study adds an explicit extinction model and parameter recovery tests.
- usesTested centroid fits do not show a clear shift at the known KIC 8027456 dip in Kepler quarter 15
Known event selection, independent-of-centroid profile parameters, and shared input provenance.
- Six baseline fits give a positive pre-dip response in Kepler quarter 15 of KIC 8027456
Prior same-event asymmetry study.
- usesNo extra fixed-profile dip exceeds brightening controls in 12 corrected Kepler quarters of KIC 8027456
Prior local shape measurement for the known event.
- usesA fixed-shape scan finds no second 300-ppm dip in tested Kepler quarter 15 intervals of KIC 8027456
Published fixed shape parameters and reference time. We add a search away from that known event.