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Previous studies have demonstrated the planet-metallicity correlation for large planets ($R_P\\ \\geq\\ 4\\ R_E$); however, a correlation has not been found for smaller planets. With a sample of 406 $Kepler$ Objects of Interest whose stellar properties are determined spectroscopically, we reveal a universal planet-metallicity correlation: not only gas-giant planets ($3.9\\ R_E\\ < R_P\\ \\leq\\ 22.0\\ R_E$) but also gas-dwarf ($1.7\\ R_E\\ < R_P\\ \\leq\\ 3.9\\ R_E$) and terrestrial planets ($R_P\\ \\leq\\ 1.7\\ R"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1310.7830","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2013-10-29T15:19:23Z","cross_cats_sorted":[],"title_canon_sha256":"1a5a76f4e0279cb2d31a593acfcfc85e56775314d14986d102d7fe2873f33b9c","abstract_canon_sha256":"92fd42f3dcc316897675d3034358cdaffba91003a1f9803d5944a5c4194935f4"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:53:35.322566Z","signature_b64":"vOUny0010kC4nLZ24UwOi8iZA6yJ6axCyCJI1Y8FURvFDvhkNxO+kRmxy2/xPiywjglat4zwSPqcwb4k0V2TAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ae9219bdc8ca78c83d0fea8a9c6977993d509aa4a37fd0384baed2dc0aadcaae","last_reissued_at":"2026-05-18T00:53:35.322188Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:53:35.322188Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Revealing A Universal Planet-Metallicity Correlation For Planets of Different Sizes Around Solar-Type Stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Debra A. 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