{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:P5H2ATLQLOLDADZPDU6MTDN4HE","short_pith_number":"pith:P5H2ATLQ","canonical_record":{"source":{"id":"2407.17196","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-07-24T11:55:48Z","cross_cats_sorted":[],"title_canon_sha256":"f27ed11025ce1947943ad9593b22dbeaf120d5d35707673e96d1abcaec8a4da4","abstract_canon_sha256":"12543b3d6a2edbd1d1a5aa81bed110b234bc3b6a663fe5bb7602781c056a30ab"},"schema_version":"1.0"},"canonical_sha256":"7f4fa04d705b96300f2f1d3cc98dbc39114ae371d553bfa736fa7f2b309839ac","source":{"kind":"arxiv","id":"2407.17196","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2407.17196","created_at":"2026-07-05T08:48:03Z"},{"alias_kind":"arxiv_version","alias_value":"2407.17196v1","created_at":"2026-07-05T08:48:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2407.17196","created_at":"2026-07-05T08:48:03Z"},{"alias_kind":"pith_short_12","alias_value":"P5H2ATLQLOLD","created_at":"2026-07-05T08:48:03Z"},{"alias_kind":"pith_short_16","alias_value":"P5H2ATLQLOLDADZP","created_at":"2026-07-05T08:48:03Z"},{"alias_kind":"pith_short_8","alias_value":"P5H2ATLQ","created_at":"2026-07-05T08:48:03Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:P5H2ATLQLOLDADZPDU6MTDN4HE","target":"record","payload":{"canonical_record":{"source":{"id":"2407.17196","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-07-24T11:55:48Z","cross_cats_sorted":[],"title_canon_sha256":"f27ed11025ce1947943ad9593b22dbeaf120d5d35707673e96d1abcaec8a4da4","abstract_canon_sha256":"12543b3d6a2edbd1d1a5aa81bed110b234bc3b6a663fe5bb7602781c056a30ab"},"schema_version":"1.0"},"canonical_sha256":"7f4fa04d705b96300f2f1d3cc98dbc39114ae371d553bfa736fa7f2b309839ac","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:48:03.754368Z","signature_b64":"bkOy88ZBerK91o7PA/NQAn2sEpUOk0ptOKRYcixJtJsauCag6uE6D25xkfpfYuIBxtWcrmS8XVYLacQ1AuXzDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7f4fa04d705b96300f2f1d3cc98dbc39114ae371d553bfa736fa7f2b309839ac","last_reissued_at":"2026-07-05T08:48:03.753966Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:48:03.753966Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2407.17196","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T08:48:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xH6y182F2RkiPyWVHp3wkF2fhK6tXaCEHNvUQGloz+tkwQ6Ib+6Fda9jM6JqT3aZsWtcCy6u+mgDtCTCZYUoCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T20:46:56.175916Z"},"content_sha256":"3502b597787d69e59c42bc72ad19571c82ddc64a973f38d8b1dc3e4d7e41f962","schema_version":"1.0","event_id":"sha256:3502b597787d69e59c42bc72ad19571c82ddc64a973f38d8b1dc3e4d7e41f962"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:P5H2ATLQLOLDADZPDU6MTDN4HE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Metal accretion scars may be common on magnetic, polluted white dwarfs","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"C.P. Folsom, J.D. Landstreet, J. Farihi, L. Fossati, M.A. Hollands, S. Bagnulo","submitted_at":"2024-07-24T11:55:48Z","abstract_excerpt":"More than 30% of white dwarfs exhibit atmospheric metals, which are understood to be from recent or ongoing accretion of circumstellar debris. In cool white dwarfs, surface motions should rapidly homogenise photospheric abundances, and the accreted heavy elements should diffuse inward on a timescale much longer than that for surface mixing. The recent discovery of a metal scar on WD0816-310 implies its magnetic field has impeded surface mixing of metals near the visible magnetic pole. Here, we report the discovery of a second magnetic, metal-polluted white dwarf, WD2138-332, which exhibits per"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.17196","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2407.17196/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T08:48:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OcmErt/65Zl80cEFr1jfgeNmvCsZIr+K8Hks321XrQWLV4kIfUc+/AICk0aG3cnOOvvQN4Ckw9CuYnnYsF9xDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T20:46:56.176489Z"},"content_sha256":"5635f08a6ed1e03ae6537590e1a69dfc06ffaf88f4c145ad297937e47aab6888","schema_version":"1.0","event_id":"sha256:5635f08a6ed1e03ae6537590e1a69dfc06ffaf88f4c145ad297937e47aab6888"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/P5H2ATLQLOLDADZPDU6MTDN4HE/bundle.json","state_url":"https://pith.science/pith/P5H2ATLQLOLDADZPDU6MTDN4HE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/P5H2ATLQLOLDADZPDU6MTDN4HE/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-01T20:46:56Z","links":{"resolver":"https://pith.science/pith/P5H2ATLQLOLDADZPDU6MTDN4HE","bundle":"https://pith.science/pith/P5H2ATLQLOLDADZPDU6MTDN4HE/bundle.json","state":"https://pith.science/pith/P5H2ATLQLOLDADZPDU6MTDN4HE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/P5H2ATLQLOLDADZPDU6MTDN4HE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:P5H2ATLQLOLDADZPDU6MTDN4HE","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"12543b3d6a2edbd1d1a5aa81bed110b234bc3b6a663fe5bb7602781c056a30ab","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-07-24T11:55:48Z","title_canon_sha256":"f27ed11025ce1947943ad9593b22dbeaf120d5d35707673e96d1abcaec8a4da4"},"schema_version":"1.0","source":{"id":"2407.17196","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2407.17196","created_at":"2026-07-05T08:48:03Z"},{"alias_kind":"arxiv_version","alias_value":"2407.17196v1","created_at":"2026-07-05T08:48:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2407.17196","created_at":"2026-07-05T08:48:03Z"},{"alias_kind":"pith_short_12","alias_value":"P5H2ATLQLOLD","created_at":"2026-07-05T08:48:03Z"},{"alias_kind":"pith_short_16","alias_value":"P5H2ATLQLOLDADZP","created_at":"2026-07-05T08:48:03Z"},{"alias_kind":"pith_short_8","alias_value":"P5H2ATLQ","created_at":"2026-07-05T08:48:03Z"}],"graph_snapshots":[{"event_id":"sha256:5635f08a6ed1e03ae6537590e1a69dfc06ffaf88f4c145ad297937e47aab6888","target":"graph","created_at":"2026-07-05T08:48:03Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2407.17196/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"More than 30% of white dwarfs exhibit atmospheric metals, which are understood to be from recent or ongoing accretion of circumstellar debris. In cool white dwarfs, surface motions should rapidly homogenise photospheric abundances, and the accreted heavy elements should diffuse inward on a timescale much longer than that for surface mixing. The recent discovery of a metal scar on WD0816-310 implies its magnetic field has impeded surface mixing of metals near the visible magnetic pole. Here, we report the discovery of a second magnetic, metal-polluted white dwarf, WD2138-332, which exhibits per","authors_text":"C.P. Folsom, J.D. Landstreet, J. Farihi, L. Fossati, M.A. Hollands, S. Bagnulo","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-07-24T11:55:48Z","title":"Metal accretion scars may be common on magnetic, polluted white dwarfs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.17196","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:3502b597787d69e59c42bc72ad19571c82ddc64a973f38d8b1dc3e4d7e41f962","target":"record","created_at":"2026-07-05T08:48:03Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"12543b3d6a2edbd1d1a5aa81bed110b234bc3b6a663fe5bb7602781c056a30ab","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-07-24T11:55:48Z","title_canon_sha256":"f27ed11025ce1947943ad9593b22dbeaf120d5d35707673e96d1abcaec8a4da4"},"schema_version":"1.0","source":{"id":"2407.17196","kind":"arxiv","version":1}},"canonical_sha256":"7f4fa04d705b96300f2f1d3cc98dbc39114ae371d553bfa736fa7f2b309839ac","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7f4fa04d705b96300f2f1d3cc98dbc39114ae371d553bfa736fa7f2b309839ac","first_computed_at":"2026-07-05T08:48:03.753966Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:48:03.753966Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bkOy88ZBerK91o7PA/NQAn2sEpUOk0ptOKRYcixJtJsauCag6uE6D25xkfpfYuIBxtWcrmS8XVYLacQ1AuXzDg==","signature_status":"signed_v1","signed_at":"2026-07-05T08:48:03.754368Z","signed_message":"canonical_sha256_bytes"},"source_id":"2407.17196","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3502b597787d69e59c42bc72ad19571c82ddc64a973f38d8b1dc3e4d7e41f962","sha256:5635f08a6ed1e03ae6537590e1a69dfc06ffaf88f4c145ad297937e47aab6888"],"state_sha256":"b0bbdaa5bbac53d5d47d194d14c9320d70479d19965a124b342bb6d121949cf4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dOroI/nwR1kGDYmw9gYsgo3QXqFVZolAC2XGFV2oFEAqT76x+mL2GxetEzlRPUKgb9xjfb3Vy8X0wqq6LjWRCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-01T20:46:56.180535Z","bundle_sha256":"7280e30689a69386aae4ba38876ad3295b540278cfe531ef4345e4dfddcc8026"}}