Gaussian Processes and Nested Sampling Applied to Kepler's Small Long-period Exoplanet Candidates
Article
Matesic, Michael R. B., Rowe, Jason F., Livingston, John H., Dholakia, Shishir, Jontof-Hutter, Daniel and Lissauer, Jack J.. 2024. "Gaussian Processes and Nested Sampling Applied to Kepler's Small Long-period Exoplanet Candidates." The Astronomical Journal. 167 (2). https://doi.org/10.3847/1538-3881/ad0fe9
Article Title | Gaussian Processes and Nested Sampling Applied to Kepler's Small Long-period Exoplanet Candidates |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Matesic, Michael R. B., Rowe, Jason F., Livingston, John H., Dholakia, Shishir, Jontof-Hutter, Daniel and Lissauer, Jack J. |
Journal Title | The Astronomical Journal |
Journal Citation | 167 (2) |
Article Number | 68 |
Number of Pages | 15 |
Year | 2024 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ad0fe9 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ad0fe9 |
Abstract | There are more than 5000 confirmed and validated planets beyond the solar system to date, more than half of which were discovered by NASA's Kepler mission. The catalog of Kepler's exoplanet candidates has only been extensively analyzed under the assumption of white noise (i.i.d. Gaussian), which breaks down on timescales longer than a day due to correlated noise (point-to-point correlation) from stellar variability and instrumental effects. Statistical validation of candidate transit events becomes increasingly difficult when they are contaminated by this form of correlated noise, especially in the low-signal-to-noise (S/N) regimes occupied by Earth–Sun and Venus–Sun analogs. To diagnose small long-period, low-S/N putative transit signatures with few (roughly 3–9) observed transit-like events (e.g., Earth–Sun analogs), we model Kepler's photometric data as noise, treated as a Gaussian process, with and without the inclusion of a transit model. Nested sampling algorithms from the Python UltraNest package recover model evidences and maximum a posteriori parameter sets, allowing us to disposition transit signatures as either planet candidates or false alarms within a Bayesian framework. |
Keywords | Kepler mission stellar |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | University of Montreal, Canada |
Bishop’s University, Canada | |
Astrobiology Center, Japan | |
National Astronomical Observatory of Japan, Japan | |
Graduate University for Advanced Studies, Japan | |
Centre for Astrophysics | |
University of the Pacific, United States | |
NASA Ames Research Center, United States |
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