{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:PKTLIB7XSSDJ6SM6FHTJLCBBQ7","short_pith_number":"pith:PKTLIB7X","canonical_record":{"source":{"id":"1510.06078","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-10-20T22:25:25Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"50f8f3a255587402e88c02c8c02f7dc51a54362e4b5946cb9bed24e8af530c23","abstract_canon_sha256":"e8ff8b0d369f2f344fa27ba20b595bad59066d25a944b8a8119c02947a85704f"},"schema_version":"1.0"},"canonical_sha256":"7aa6b407f794869f499e29e695882187e59d43f491ca108128772708dd6d05d3","source":{"kind":"arxiv","id":"1510.06078","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.06078","created_at":"2026-05-18T01:26:33Z"},{"alias_kind":"arxiv_version","alias_value":"1510.06078v1","created_at":"2026-05-18T01:26:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.06078","created_at":"2026-05-18T01:26:33Z"},{"alias_kind":"pith_short_12","alias_value":"PKTLIB7XSSDJ","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"PKTLIB7XSSDJ6SM6","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"PKTLIB7X","created_at":"2026-05-18T12:29:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:PKTLIB7XSSDJ6SM6FHTJLCBBQ7","target":"record","payload":{"canonical_record":{"source":{"id":"1510.06078","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-10-20T22:25:25Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"50f8f3a255587402e88c02c8c02f7dc51a54362e4b5946cb9bed24e8af530c23","abstract_canon_sha256":"e8ff8b0d369f2f344fa27ba20b595bad59066d25a944b8a8119c02947a85704f"},"schema_version":"1.0"},"canonical_sha256":"7aa6b407f794869f499e29e695882187e59d43f491ca108128772708dd6d05d3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:26:33.630695Z","signature_b64":"vwHJmBjZWlAox5/0XCVWPZ2SnThoqQVq6wD8RybuG+8TL18plGEUsV8pcHF3bJB72b2ypJZKGtiqpypphcPJAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7aa6b407f794869f499e29e695882187e59d43f491ca108128772708dd6d05d3","last_reissued_at":"2026-05-18T01:26:33.630136Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:26:33.630136Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.06078","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":"2026-05-18T01:26:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hEnAw7e8J1Kfyl1SslhklCx8pgOwMcV/QpqzFRWlmS+xYJY93ZIX8D6PGhH5KevUIpEyzn1OqJTeRx9r2jlmAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T05:19:37.929553Z"},"content_sha256":"6c5170d2da823b1dcf04b580de47e16936c25e80608473b9987c6677dfc5ed8c","schema_version":"1.0","event_id":"sha256:6c5170d2da823b1dcf04b580de47e16936c25e80608473b9987c6677dfc5ed8c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:PKTLIB7XSSDJ6SM6FHTJLCBBQ7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Periodic modulation in pulse arrival times from young pulsars: a renewed case for neutron star precession","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.SR","authors_text":"George Hobbs, Matthew Kerr, Ryan Shannon, Simon Johnston","submitted_at":"2015-10-20T22:25:25Z","abstract_excerpt":"In a search for periodic variation in the arrival times of pulses from 151 young, energetic pulsars, we have identified seven cases of modulation consistent with one or two harmonics of a single fundamental with time-scale 0.5-1.5 yr. We use simulations to show that these modulations are statistically significant and of high quality (sinusoidal) even when contaminated by the strong stochastic timing noise common to young pulsars. Although planetary companions could induce such modulation, the large implied masses and 2:1 mean motion resonances challenge such an explanation. Instead, the modula"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.06078","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:26:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Dr68cmX2JMDUtPMRDdy5Mxt8BDUL8178C2HCrAQD1Sip1I+K4YLnVIXmt0q3v6jFyy+6lzi7p0EhBE8N/p75Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T05:19:37.929900Z"},"content_sha256":"ce595cf4044f42f0fc695908cbf3084f069df0a7bb5e275003267203578f5ff1","schema_version":"1.0","event_id":"sha256:ce595cf4044f42f0fc695908cbf3084f069df0a7bb5e275003267203578f5ff1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PKTLIB7XSSDJ6SM6FHTJLCBBQ7/bundle.json","state_url":"https://pith.science/pith/PKTLIB7XSSDJ6SM6FHTJLCBBQ7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PKTLIB7XSSDJ6SM6FHTJLCBBQ7/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":"2026-05-30T05:19:37Z","links":{"resolver":"https://pith.science/pith/PKTLIB7XSSDJ6SM6FHTJLCBBQ7","bundle":"https://pith.science/pith/PKTLIB7XSSDJ6SM6FHTJLCBBQ7/bundle.json","state":"https://pith.science/pith/PKTLIB7XSSDJ6SM6FHTJLCBBQ7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PKTLIB7XSSDJ6SM6FHTJLCBBQ7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:PKTLIB7XSSDJ6SM6FHTJLCBBQ7","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":"e8ff8b0d369f2f344fa27ba20b595bad59066d25a944b8a8119c02947a85704f","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-10-20T22:25:25Z","title_canon_sha256":"50f8f3a255587402e88c02c8c02f7dc51a54362e4b5946cb9bed24e8af530c23"},"schema_version":"1.0","source":{"id":"1510.06078","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.06078","created_at":"2026-05-18T01:26:33Z"},{"alias_kind":"arxiv_version","alias_value":"1510.06078v1","created_at":"2026-05-18T01:26:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.06078","created_at":"2026-05-18T01:26:33Z"},{"alias_kind":"pith_short_12","alias_value":"PKTLIB7XSSDJ","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"PKTLIB7XSSDJ6SM6","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"PKTLIB7X","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:ce595cf4044f42f0fc695908cbf3084f069df0a7bb5e275003267203578f5ff1","target":"graph","created_at":"2026-05-18T01:26:33Z","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"},"paper":{"abstract_excerpt":"In a search for periodic variation in the arrival times of pulses from 151 young, energetic pulsars, we have identified seven cases of modulation consistent with one or two harmonics of a single fundamental with time-scale 0.5-1.5 yr. We use simulations to show that these modulations are statistically significant and of high quality (sinusoidal) even when contaminated by the strong stochastic timing noise common to young pulsars. Although planetary companions could induce such modulation, the large implied masses and 2:1 mean motion resonances challenge such an explanation. Instead, the modula","authors_text":"George Hobbs, Matthew Kerr, Ryan Shannon, Simon Johnston","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-10-20T22:25:25Z","title":"Periodic modulation in pulse arrival times from young pulsars: a renewed case for neutron star precession"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.06078","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":"sha256:6c5170d2da823b1dcf04b580de47e16936c25e80608473b9987c6677dfc5ed8c","target":"record","created_at":"2026-05-18T01:26:33Z","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":"e8ff8b0d369f2f344fa27ba20b595bad59066d25a944b8a8119c02947a85704f","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-10-20T22:25:25Z","title_canon_sha256":"50f8f3a255587402e88c02c8c02f7dc51a54362e4b5946cb9bed24e8af530c23"},"schema_version":"1.0","source":{"id":"1510.06078","kind":"arxiv","version":1}},"canonical_sha256":"7aa6b407f794869f499e29e695882187e59d43f491ca108128772708dd6d05d3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7aa6b407f794869f499e29e695882187e59d43f491ca108128772708dd6d05d3","first_computed_at":"2026-05-18T01:26:33.630136Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:26:33.630136Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vwHJmBjZWlAox5/0XCVWPZ2SnThoqQVq6wD8RybuG+8TL18plGEUsV8pcHF3bJB72b2ypJZKGtiqpypphcPJAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:26:33.630695Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.06078","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6c5170d2da823b1dcf04b580de47e16936c25e80608473b9987c6677dfc5ed8c","sha256:ce595cf4044f42f0fc695908cbf3084f069df0a7bb5e275003267203578f5ff1"],"state_sha256":"46d7b9c32859c97c4fb17e829f93070dc2424a2749fba1879e844b9083f5da34"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qWuAOOrXlOHosjwbc3mwfOO2KS/Y7JbynRAW1GQx/5wKSNxt3TEySMEhXXTqRe1s1mZKXc4EelbVl2ZSl+r8Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T05:19:37.931779Z","bundle_sha256":"8bec4c12836c6cf98dcb04cf46e3a18772a2a46844b39faeae7a7b92d2d75ad3"}}