{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2016:XWUKQMWPJGULVVV2RATW5JILSZ","short_pith_number":"pith:XWUKQMWP","schema_version":"1.0","canonical_sha256":"bda8a832cf49a8bad6ba88276ea50b9644e07e07104e95800ed0357ac94a3a41","source":{"kind":"arxiv","id":"1602.05000","version":1},"attestation_state":"computed","paper":{"title":"Extreme abundance ratios in the polluted atmosphere of the cool white dwarf NLTT19868","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Adela Kawka, Stephane Vennes","submitted_at":"2016-02-16T12:06:58Z","abstract_excerpt":"We present an analysis of intermediate-dispersion spectra and photometric data of the newly identified cool, polluted white dwarf NLTT19868. The spectra obtained with X-shooter on the Very Large Telescope (VLT)-Melipal show strong lines of calcium, and several lines of magnesium, aluminium and iron. We use these spectra and the optical-to-near infrared spectral energy distribution to constrain the atmospheric parameters of NLTT19868. Our analysis shows that NLTT19868 is iron poor with respect to aluminium and calcium. A comparison with other cool, polluted white dwarfs shows that the Fe to Ca "},"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":"1602.05000","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-02-16T12:06:58Z","cross_cats_sorted":[],"title_canon_sha256":"87932a0c4f5a8e670e32ce357ea0c2d6fd0585399a11cfccdcddbc87feaf9ad7","abstract_canon_sha256":"c59a0ccccd918d3ad26a7fdb9616099db4f028a1c7a063404791056a49991e0c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:19:24.304599Z","signature_b64":"djsroOmqqhoPKIQ4n53s2f3GjQLr8Nd3orW3Gfp/igsYsD/fnUjd9W7zXFzjsEXbOmGvhrzTor/yyi4YDAJeCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bda8a832cf49a8bad6ba88276ea50b9644e07e07104e95800ed0357ac94a3a41","last_reissued_at":"2026-05-18T01:19:24.303933Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:19:24.303933Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Extreme abundance ratios in the polluted atmosphere of the cool white dwarf NLTT19868","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Adela Kawka, Stephane Vennes","submitted_at":"2016-02-16T12:06:58Z","abstract_excerpt":"We present an analysis of intermediate-dispersion spectra and photometric data of the newly identified cool, polluted white dwarf NLTT19868. The spectra obtained with X-shooter on the Very Large Telescope (VLT)-Melipal show strong lines of calcium, and several lines of magnesium, aluminium and iron. We use these spectra and the optical-to-near infrared spectral energy distribution to constrain the atmospheric parameters of NLTT19868. Our analysis shows that NLTT19868 is iron poor with respect to aluminium and calcium. A comparison with other cool, polluted white dwarfs shows that the Fe to Ca "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.05000","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":""},"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":"1602.05000","created_at":"2026-05-18T01:19:24.304015+00:00"},{"alias_kind":"arxiv_version","alias_value":"1602.05000v1","created_at":"2026-05-18T01:19:24.304015+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.05000","created_at":"2026-05-18T01:19:24.304015+00:00"},{"alias_kind":"pith_short_12","alias_value":"XWUKQMWPJGUL","created_at":"2026-05-18T12:30:51.357362+00:00"},{"alias_kind":"pith_short_16","alias_value":"XWUKQMWPJGULVVV2","created_at":"2026-05-18T12:30:51.357362+00:00"},{"alias_kind":"pith_short_8","alias_value":"XWUKQMWP","created_at":"2026-05-18T12:30:51.357362+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/XWUKQMWPJGULVVV2RATW5JILSZ","json":"https://pith.science/pith/XWUKQMWPJGULVVV2RATW5JILSZ.json","graph_json":"https://pith.science/api/pith-number/XWUKQMWPJGULVVV2RATW5JILSZ/graph.json","events_json":"https://pith.science/api/pith-number/XWUKQMWPJGULVVV2RATW5JILSZ/events.json","paper":"https://pith.science/paper/XWUKQMWP"},"agent_actions":{"view_html":"https://pith.science/pith/XWUKQMWPJGULVVV2RATW5JILSZ","download_json":"https://pith.science/pith/XWUKQMWPJGULVVV2RATW5JILSZ.json","view_paper":"https://pith.science/paper/XWUKQMWP","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1602.05000&json=true","fetch_graph":"https://pith.science/api/pith-number/XWUKQMWPJGULVVV2RATW5JILSZ/graph.json","fetch_events":"https://pith.science/api/pith-number/XWUKQMWPJGULVVV2RATW5JILSZ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XWUKQMWPJGULVVV2RATW5JILSZ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XWUKQMWPJGULVVV2RATW5JILSZ/action/storage_attestation","attest_author":"https://pith.science/pith/XWUKQMWPJGULVVV2RATW5JILSZ/action/author_attestation","sign_citation":"https://pith.science/pith/XWUKQMWPJGULVVV2RATW5JILSZ/action/citation_signature","submit_replication":"https://pith.science/pith/XWUKQMWPJGULVVV2RATW5JILSZ/action/replication_record"}},"created_at":"2026-05-18T01:19:24.304015+00:00","updated_at":"2026-05-18T01:19:24.304015+00:00"}