{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2022:EGAKH2I7URROV4XJA5VAVQAEKI","short_pith_number":"pith:EGAKH2I7","schema_version":"1.0","canonical_sha256":"2180a3e91fa462eaf2e9076a0ac004523256e75df78614eb1014a1d333008f1f","source":{"kind":"arxiv","id":"2211.02673","version":1},"attestation_state":"computed","paper":{"title":"Unusual Abundances from Planetary System Material Polluting the White Dwarf G238-44","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Beth L. Klein, B. Zuckerman, Carl Melis, D. Koester, M. Jura, Ted M Johnson","submitted_at":"2022-11-04T18:00:05Z","abstract_excerpt":"Ultraviolet and optical spectra of the hydrogen-dominated atmosphere white dwarf star G238-44 obtained with FUSE, Keck/HIRES, HST/COS, and HST/STIS reveal ten elements heavier than helium: C, N, O, Mg, Al, Si, P, S, Ca, and Fe. G238-44 is only the third white dwarf with nitrogen detected in its atmosphere from polluting planetary system material. Keck/HIRES data taken on eleven nights over 24 years show no evidence for variation in the equivalent width of measured absorption lines, suggesting stable and continuous accretion from a circumstellar reservoir. From measured abundances and limits on"},"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":"2211.02673","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2022-11-04T18:00:05Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"b3ce9f565949739eb74849e1f4fc047e4073bc128c6b03c6e0aedd08eae0b3a1","abstract_canon_sha256":"d43d40fcb514f1d46d6b390748459be8f5839ad7177cbae155804bb0375a6e85"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:26:56.111806Z","signature_b64":"cGn1Pme7ejOL5FMgapW3OlcXd6O5bRqgqICKHUOJXLmWUrLnzgsdY8MQa3vdUjnNRqgCL4MRhf5I5MPjIsNpDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2180a3e91fa462eaf2e9076a0ac004523256e75df78614eb1014a1d333008f1f","last_reissued_at":"2026-07-05T05:26:56.111240Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:26:56.111240Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Unusual Abundances from Planetary System Material Polluting the White Dwarf G238-44","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Beth L. Klein, B. Zuckerman, Carl Melis, D. Koester, M. Jura, Ted M Johnson","submitted_at":"2022-11-04T18:00:05Z","abstract_excerpt":"Ultraviolet and optical spectra of the hydrogen-dominated atmosphere white dwarf star G238-44 obtained with FUSE, Keck/HIRES, HST/COS, and HST/STIS reveal ten elements heavier than helium: C, N, O, Mg, Al, Si, P, S, Ca, and Fe. G238-44 is only the third white dwarf with nitrogen detected in its atmosphere from polluting planetary system material. Keck/HIRES data taken on eleven nights over 24 years show no evidence for variation in the equivalent width of measured absorption lines, suggesting stable and continuous accretion from a circumstellar reservoir. From measured abundances and limits on"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2211.02673","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/2211.02673/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2211.02673","created_at":"2026-07-05T05:26:56.111297+00:00"},{"alias_kind":"arxiv_version","alias_value":"2211.02673v1","created_at":"2026-07-05T05:26:56.111297+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2211.02673","created_at":"2026-07-05T05:26:56.111297+00:00"},{"alias_kind":"pith_short_12","alias_value":"EGAKH2I7URRO","created_at":"2026-07-05T05:26:56.111297+00:00"},{"alias_kind":"pith_short_16","alias_value":"EGAKH2I7URROV4XJ","created_at":"2026-07-05T05:26:56.111297+00:00"},{"alias_kind":"pith_short_8","alias_value":"EGAKH2I7","created_at":"2026-07-05T05:26:56.111297+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/EGAKH2I7URROV4XJA5VAVQAEKI","json":"https://pith.science/pith/EGAKH2I7URROV4XJA5VAVQAEKI.json","graph_json":"https://pith.science/api/pith-number/EGAKH2I7URROV4XJA5VAVQAEKI/graph.json","events_json":"https://pith.science/api/pith-number/EGAKH2I7URROV4XJA5VAVQAEKI/events.json","paper":"https://pith.science/paper/EGAKH2I7"},"agent_actions":{"view_html":"https://pith.science/pith/EGAKH2I7URROV4XJA5VAVQAEKI","download_json":"https://pith.science/pith/EGAKH2I7URROV4XJA5VAVQAEKI.json","view_paper":"https://pith.science/paper/EGAKH2I7","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2211.02673&json=true","fetch_graph":"https://pith.science/api/pith-number/EGAKH2I7URROV4XJA5VAVQAEKI/graph.json","fetch_events":"https://pith.science/api/pith-number/EGAKH2I7URROV4XJA5VAVQAEKI/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/EGAKH2I7URROV4XJA5VAVQAEKI/action/timestamp_anchor","attest_storage":"https://pith.science/pith/EGAKH2I7URROV4XJA5VAVQAEKI/action/storage_attestation","attest_author":"https://pith.science/pith/EGAKH2I7URROV4XJA5VAVQAEKI/action/author_attestation","sign_citation":"https://pith.science/pith/EGAKH2I7URROV4XJA5VAVQAEKI/action/citation_signature","submit_replication":"https://pith.science/pith/EGAKH2I7URROV4XJA5VAVQAEKI/action/replication_record"}},"created_at":"2026-07-05T05:26:56.111297+00:00","updated_at":"2026-07-05T05:26:56.111297+00:00"}