{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"0edc7067b385c7f1a9a806324032654d39319c9b5506dcc8949ea36505e044ad","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"e09294c29b0aa9a63c23fc6178cb4ebcb5c67682295a60b9cc49592e223a09de","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"astro.system-architectures.peas-in-a-pod","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"Planets in the same system often look alike in size and are evenly spaced, like peas in a pod. Some argue the pattern is real and records how they formed, others that it comes from which planets telescopes can detect.","posed_since":"2018","precise":"Weiss et al. 2018 (AJ 155, 48) found correlated sizes and period ratios of adjacent planets in Kepler multiplanet systems; Zhu 2020 (AJ, arXiv:1907.02074) argued the correlations arise mainly from detection thresholds varying with stellar properties and period. Determine whether the intra-system size and spacing correlations survive full forward modeling of Kepler detection efficiency, and their magnitude. The answer is yes or no with the bias-corrected correlation coefficients.","problem_ref":null,"references":"","settled_by":"Forward modeling of the full Kepler detection pipeline on synthetic populations with and without intrinsic correlations, plus an independent test with radial-velocity-detected systems that have different selection effects.","status_note":"The 2023 Protostars and Planets VII review by Weiss et al. treats the uniformity as astrophysical, while the detection-bias argument of Zhu 2020 has not been fully answered.","title":"Are planet sizes and spacings within a system truly 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