{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:N7KXMYZLZB6PM7WHG63IMENDLS","short_pith_number":"pith:N7KXMYZL","schema_version":"1.0","canonical_sha256":"6fd576632bc87cf67ec737b68611a35c8b9d70edc9cc8b3a393dc8da1dcd38f2","source":{"kind":"arxiv","id":"1707.08609","version":1},"attestation_state":"computed","paper":{"title":"Freely Expanding Knots of X-ray Emitting Ejecta in Kepler's Supernova Remnant","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"2), (2) ISAS/JAXA, (3) Rutgers University, 4) ((1) Tokyo Metropolitan University, (4) Flatiron Institute), John P. Hughes (3, Toshiki Sato (1","submitted_at":"2017-07-26T19:00:28Z","abstract_excerpt":"We report measurements of proper motion, radial velocity, and elemental composition for 14 X-ray knots in Kepler's supernova remnant (SNR) using Chandra data. The highest speed knots show both large proper motions (0.11-0.14 \"/yr) and high radial velocities (v ~ 8,700--10,020 km/s) with estimated space velocities comparable to the typical Si velocity (~10,000 km/s) seen in SN Ia near maximum light. High speed ejecta knots appear only in specific locations and are morphologically and kinematically distinct from the rest of the ejecta. The proper motions of five knots extrapolate back over the a"},"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":"1707.08609","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-07-26T19:00:28Z","cross_cats_sorted":[],"title_canon_sha256":"28284ff890b85b50624b9787b2445601fdc54af95bbe36c2de6e4b52971017b4","abstract_canon_sha256":"dfa4a03867bc97a96860b7ebfc54e011a6d67c10870ed46b69aff389f7ddbeab"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:36:28.107811Z","signature_b64":"mXoRSzQUnKalw6uSoGJgFMI4eqb63wLgJNhtlGyKYN0XierM0KtjOnVpdNzl5Kli9ILUErDq5/ioOjjF/6UABA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6fd576632bc87cf67ec737b68611a35c8b9d70edc9cc8b3a393dc8da1dcd38f2","last_reissued_at":"2026-05-18T00:36:28.107145Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:36:28.107145Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Freely Expanding Knots of X-ray Emitting Ejecta in Kepler's Supernova Remnant","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"2), (2) ISAS/JAXA, (3) Rutgers University, 4) ((1) Tokyo Metropolitan University, (4) Flatiron Institute), John P. Hughes (3, Toshiki Sato (1","submitted_at":"2017-07-26T19:00:28Z","abstract_excerpt":"We report measurements of proper motion, radial velocity, and elemental composition for 14 X-ray knots in Kepler's supernova remnant (SNR) using Chandra data. The highest speed knots show both large proper motions (0.11-0.14 \"/yr) and high radial velocities (v ~ 8,700--10,020 km/s) with estimated space velocities comparable to the typical Si velocity (~10,000 km/s) seen in SN Ia near maximum light. High speed ejecta knots appear only in specific locations and are morphologically and kinematically distinct from the rest of the ejecta. The proper motions of five knots extrapolate back over the a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.08609","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":"1707.08609","created_at":"2026-05-18T00:36:28.107267+00:00"},{"alias_kind":"arxiv_version","alias_value":"1707.08609v1","created_at":"2026-05-18T00:36:28.107267+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.08609","created_at":"2026-05-18T00:36:28.107267+00:00"},{"alias_kind":"pith_short_12","alias_value":"N7KXMYZLZB6P","created_at":"2026-05-18T12:31:31.346846+00:00"},{"alias_kind":"pith_short_16","alias_value":"N7KXMYZLZB6PM7WH","created_at":"2026-05-18T12:31:31.346846+00:00"},{"alias_kind":"pith_short_8","alias_value":"N7KXMYZL","created_at":"2026-05-18T12:31:31.346846+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/N7KXMYZLZB6PM7WHG63IMENDLS","json":"https://pith.science/pith/N7KXMYZLZB6PM7WHG63IMENDLS.json","graph_json":"https://pith.science/api/pith-number/N7KXMYZLZB6PM7WHG63IMENDLS/graph.json","events_json":"https://pith.science/api/pith-number/N7KXMYZLZB6PM7WHG63IMENDLS/events.json","paper":"https://pith.science/paper/N7KXMYZL"},"agent_actions":{"view_html":"https://pith.science/pith/N7KXMYZLZB6PM7WHG63IMENDLS","download_json":"https://pith.science/pith/N7KXMYZLZB6PM7WHG63IMENDLS.json","view_paper":"https://pith.science/paper/N7KXMYZL","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1707.08609&json=true","fetch_graph":"https://pith.science/api/pith-number/N7KXMYZLZB6PM7WHG63IMENDLS/graph.json","fetch_events":"https://pith.science/api/pith-number/N7KXMYZLZB6PM7WHG63IMENDLS/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/N7KXMYZLZB6PM7WHG63IMENDLS/action/timestamp_anchor","attest_storage":"https://pith.science/pith/N7KXMYZLZB6PM7WHG63IMENDLS/action/storage_attestation","attest_author":"https://pith.science/pith/N7KXMYZLZB6PM7WHG63IMENDLS/action/author_attestation","sign_citation":"https://pith.science/pith/N7KXMYZLZB6PM7WHG63IMENDLS/action/citation_signature","submit_replication":"https://pith.science/pith/N7KXMYZLZB6PM7WHG63IMENDLS/action/replication_record"}},"created_at":"2026-05-18T00:36:28.107267+00:00","updated_at":"2026-05-18T00:36:28.107267+00:00"}