{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:6MOYLFA4DLWZUWIAOVOHZI2HL5","short_pith_number":"pith:6MOYLFA4","canonical_record":{"source":{"id":"1807.05909","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-16T15:03:56Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"745939bc56a3bbdf32105769ac1be41dd4afb92dc84e8c864294c052672fbad6","abstract_canon_sha256":"06d105021a6680265f63d2a1941dc26480ff6d22281c009d446d7e45dd0f4bf6"},"schema_version":"1.0"},"canonical_sha256":"f31d85941c1aed9a5900755c7ca3475f41855bc785080e92cd62c7db999b9696","source":{"kind":"arxiv","id":"1807.05909","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.05909","created_at":"2026-05-17T23:59:07Z"},{"alias_kind":"arxiv_version","alias_value":"1807.05909v2","created_at":"2026-05-17T23:59:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.05909","created_at":"2026-05-17T23:59:07Z"},{"alias_kind":"pith_short_12","alias_value":"6MOYLFA4DLWZ","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"6MOYLFA4DLWZUWIA","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"6MOYLFA4","created_at":"2026-05-18T12:32:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:6MOYLFA4DLWZUWIAOVOHZI2HL5","target":"record","payload":{"canonical_record":{"source":{"id":"1807.05909","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-16T15:03:56Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"745939bc56a3bbdf32105769ac1be41dd4afb92dc84e8c864294c052672fbad6","abstract_canon_sha256":"06d105021a6680265f63d2a1941dc26480ff6d22281c009d446d7e45dd0f4bf6"},"schema_version":"1.0"},"canonical_sha256":"f31d85941c1aed9a5900755c7ca3475f41855bc785080e92cd62c7db999b9696","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:59:07.960711Z","signature_b64":"XpUny+WOmTI4uRp7hGGqIbcH5G0v137WZFii6MF6dSwL5hXzURCZ8aPgaceKriv+zYwkcdRrJBMoB+BVarGsDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f31d85941c1aed9a5900755c7ca3475f41855bc785080e92cd62c7db999b9696","last_reissued_at":"2026-05-17T23:59:07.960211Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:59:07.960211Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.05909","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:59:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QyTya+ebK8uLrHj5KCi3mYCXqlcnIEEi5EZPHJy5AupoGGpmoH1/5oa1LwYSS9AJIoidaolVP5tloeqGoWd6AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T23:24:02.123924Z"},"content_sha256":"253b7eededb6428bb83f8988f45ab7f173603a0e9f32f1314f280cfb2f4838c0","schema_version":"1.0","event_id":"sha256:253b7eededb6428bb83f8988f45ab7f173603a0e9f32f1314f280cfb2f4838c0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:6MOYLFA4DLWZUWIAOVOHZI2HL5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hypervelocity stars in the Gaia era: Runaway B stars beyond the velocity limit of classical ejection mechanisms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Andreas Irrgang, Simon Kreuzer, Ulrich Heber","submitted_at":"2018-07-16T15:03:56Z","abstract_excerpt":"Young massive stars in the halo are assumed to be runaway stars from the Galactic disk. Possible ejection scenarios are binary supernova ejections (BSE) or dynamical ejections from star clusters (DE). Hypervelocity stars (HVSs) are extreme runaway stars that are potentially unbound from the Galaxy. Powerful acceleration mechanisms such as the tidal disruption of a binary system by a supermassive black hole (SMBH) are required to produce them. Therefore, HVSs are believed to originate in the Galactic center (GC), the only place known to host an SMBH. The second Gaia data release (DR2) offers th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.05909","kind":"arxiv","version":2},"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":"2026-05-17T23:59:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZWMjXApVb3TnJSVfuUnNvUAybfaPiV1ma0PRy29Ji/u5pHP47cDzzJp0X1PZ4Y4+/tt/eKxjCB9gKM8UH5c8CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T23:24:02.124624Z"},"content_sha256":"7e4ae8ad835c6bfc475e2134731b842758d83c2acb1c7e3efba331de364cf3b9","schema_version":"1.0","event_id":"sha256:7e4ae8ad835c6bfc475e2134731b842758d83c2acb1c7e3efba331de364cf3b9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6MOYLFA4DLWZUWIAOVOHZI2HL5/bundle.json","state_url":"https://pith.science/pith/6MOYLFA4DLWZUWIAOVOHZI2HL5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6MOYLFA4DLWZUWIAOVOHZI2HL5/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":"2026-06-07T23:24:02Z","links":{"resolver":"https://pith.science/pith/6MOYLFA4DLWZUWIAOVOHZI2HL5","bundle":"https://pith.science/pith/6MOYLFA4DLWZUWIAOVOHZI2HL5/bundle.json","state":"https://pith.science/pith/6MOYLFA4DLWZUWIAOVOHZI2HL5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6MOYLFA4DLWZUWIAOVOHZI2HL5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:6MOYLFA4DLWZUWIAOVOHZI2HL5","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":"06d105021a6680265f63d2a1941dc26480ff6d22281c009d446d7e45dd0f4bf6","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-16T15:03:56Z","title_canon_sha256":"745939bc56a3bbdf32105769ac1be41dd4afb92dc84e8c864294c052672fbad6"},"schema_version":"1.0","source":{"id":"1807.05909","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.05909","created_at":"2026-05-17T23:59:07Z"},{"alias_kind":"arxiv_version","alias_value":"1807.05909v2","created_at":"2026-05-17T23:59:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.05909","created_at":"2026-05-17T23:59:07Z"},{"alias_kind":"pith_short_12","alias_value":"6MOYLFA4DLWZ","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"6MOYLFA4DLWZUWIA","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"6MOYLFA4","created_at":"2026-05-18T12:32:11Z"}],"graph_snapshots":[{"event_id":"sha256:7e4ae8ad835c6bfc475e2134731b842758d83c2acb1c7e3efba331de364cf3b9","target":"graph","created_at":"2026-05-17T23:59:07Z","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":"Young massive stars in the halo are assumed to be runaway stars from the Galactic disk. Possible ejection scenarios are binary supernova ejections (BSE) or dynamical ejections from star clusters (DE). Hypervelocity stars (HVSs) are extreme runaway stars that are potentially unbound from the Galaxy. Powerful acceleration mechanisms such as the tidal disruption of a binary system by a supermassive black hole (SMBH) are required to produce them. Therefore, HVSs are believed to originate in the Galactic center (GC), the only place known to host an SMBH. The second Gaia data release (DR2) offers th","authors_text":"Andreas Irrgang, Simon Kreuzer, Ulrich Heber","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-16T15:03:56Z","title":"Hypervelocity stars in the Gaia era: Runaway B stars beyond the velocity limit of classical ejection mechanisms"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.05909","kind":"arxiv","version":2},"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":"sha256:253b7eededb6428bb83f8988f45ab7f173603a0e9f32f1314f280cfb2f4838c0","target":"record","created_at":"2026-05-17T23:59:07Z","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":"06d105021a6680265f63d2a1941dc26480ff6d22281c009d446d7e45dd0f4bf6","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-16T15:03:56Z","title_canon_sha256":"745939bc56a3bbdf32105769ac1be41dd4afb92dc84e8c864294c052672fbad6"},"schema_version":"1.0","source":{"id":"1807.05909","kind":"arxiv","version":2}},"canonical_sha256":"f31d85941c1aed9a5900755c7ca3475f41855bc785080e92cd62c7db999b9696","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f31d85941c1aed9a5900755c7ca3475f41855bc785080e92cd62c7db999b9696","first_computed_at":"2026-05-17T23:59:07.960211Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:59:07.960211Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XpUny+WOmTI4uRp7hGGqIbcH5G0v137WZFii6MF6dSwL5hXzURCZ8aPgaceKriv+zYwkcdRrJBMoB+BVarGsDQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:59:07.960711Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.05909","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:253b7eededb6428bb83f8988f45ab7f173603a0e9f32f1314f280cfb2f4838c0","sha256:7e4ae8ad835c6bfc475e2134731b842758d83c2acb1c7e3efba331de364cf3b9"],"state_sha256":"3364cbfeab5ae072b1f54bca6dc987a8f625fd99816ef1a8eb9c69929e7599bd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"btlRNY7zXBHmHK7U8lOPiTMJPDh1xN4HsqlfmUwBWEPKFxSHnh15TY7gAo7eyxVYQJD7PP2S9+UzLaPVUPjjCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T23:24:02.128918Z","bundle_sha256":"448be959ae5323cc785ada87b8dc03a0a12938bdeb6abcd1d8ddea5cec559229"}}