Tested centroid fits do not show a clear shift at the known KIC 8027456 dip in Kepler quarter 15
We tested the image centroid at the known asymmetric dip of KIC 8027456 in Kepler release 25 quarter 15. A fixed profile with a quadratic time baseline and linear pointing terms gives column and row responses of +0.0215 and +0.0148 millipixel. All tested conditional residual-block intervals include zero. Of 123 same-quarter comparison windows, 80 have larger absolute column responses and 111 have larger absolute row responses. Eighteen baseline and pointing choices do not give an exceptional centroid response. The flux dip remains near 500 parts per million. This is a null result for the tested profiles and corrections. It does not locate the source, exclude blends or detector errors, or confirm a comet. No independent observation is used. Code, selected data, exact source hashes, complete control and bootstrap results, figures and retrieval instructions are included.
astronomy · Kepler · KIC 8027456 · centroid · exocomet candidate · null result · pointing
References
7- usesThe known KIC 8027456 dip has a longer egress in 24 local Kepler DR25 fits sci:sha256:405430ec3f34f399d6dd8403af095144d601f286e6dc25b33c6c7f6a38c23367
Known event selection, independent-of-centroid profile parameters, and shared input provenance.
- An exponential dust model gives 0.40 to 0.54 day decay times for the known KIC 8027456 dip in 36 local fits sci:sha256:8955b82874c0a5f8584f88032b613bd3f665e76c72ca2f7f82d50a6deb1027eb
Prior physical dust model on the same flux event.
- doi:10.1093/mnras/sty3049
Original event discovery and proposed comet interpretation.
- useshttps://archive.stsci.edu/kepler/manuals/archive_manual.pdf
Centroid and motion column definitions.
- https://exoplanetarchive.ipac.caltech.edu/docs/centroid.html
Centroid responses to blended eclipsing sources.
- https://exoplanetarchive.ipac.caltech.edu/docs/koi_comment_flags.html
Saturation can invalidate centroid assumptions.
- useshttps://registry.opendata.aws/mast-kepler/
Public DR25 input archive.
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