{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:V32K3A3JDRY2Y2SQTR42YXFMXW","short_pith_number":"pith:V32K3A3J","canonical_record":{"source":{"id":"1407.2405","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-07-09T09:36:53Z","cross_cats_sorted":[],"title_canon_sha256":"945f2e89ce8422bae8fdbceed39623c4e6b72fea3f0e39da265e34faadf0c90e","abstract_canon_sha256":"1cf1f4713d2c79a02acd85ebcb48bfa12dac80d5c78838168d9de6272304121b"},"schema_version":"1.0"},"canonical_sha256":"aef4ad83691c71ac6a509c79ac5cacbda305d1dbdadca0780c56bc0b0049df0a","source":{"kind":"arxiv","id":"1407.2405","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.2405","created_at":"2026-05-18T02:43:46Z"},{"alias_kind":"arxiv_version","alias_value":"1407.2405v2","created_at":"2026-05-18T02:43:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.2405","created_at":"2026-05-18T02:43:46Z"},{"alias_kind":"pith_short_12","alias_value":"V32K3A3JDRY2","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"V32K3A3JDRY2Y2SQ","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"V32K3A3J","created_at":"2026-05-18T12:28:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:V32K3A3JDRY2Y2SQTR42YXFMXW","target":"record","payload":{"canonical_record":{"source":{"id":"1407.2405","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-07-09T09:36:53Z","cross_cats_sorted":[],"title_canon_sha256":"945f2e89ce8422bae8fdbceed39623c4e6b72fea3f0e39da265e34faadf0c90e","abstract_canon_sha256":"1cf1f4713d2c79a02acd85ebcb48bfa12dac80d5c78838168d9de6272304121b"},"schema_version":"1.0"},"canonical_sha256":"aef4ad83691c71ac6a509c79ac5cacbda305d1dbdadca0780c56bc0b0049df0a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:43:46.760496Z","signature_b64":"5tjfG0ia2vtIj3RXvqqVO/JTGQXj12WRbMXSn0oym3L/XCcYDDzdeGq+AySB4VTYt5VUxgtJmxNjGT7j1J1VAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aef4ad83691c71ac6a509c79ac5cacbda305d1dbdadca0780c56bc0b0049df0a","last_reissued_at":"2026-05-18T02:43:46.760092Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:43:46.760092Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1407.2405","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":"2026-05-18T02:43:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PyWBZi3C0qbBeZZYIwJ+/IATHjlG0CpxiiRq+g6jAPUKrMdT77zaVsJD9gFpsbLkNMme1sBQkeUHguLXyZA/Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T17:59:31.139665Z"},"content_sha256":"d274a2165e424901377704d452a29f4859d3c820282f619a3f5e5fbf998207bc","schema_version":"1.0","event_id":"sha256:d274a2165e424901377704d452a29f4859d3c820282f619a3f5e5fbf998207bc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:V32K3A3JDRY2Y2SQTR42YXFMXW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Binary white dwarfs in the halo of the Milky Way","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Amina Helmi, Anthony G. A. Brown, Gijs Nelemans, Onno Pols, Pim van Oirschot, Silvia Toonen, Simon Portegies Zwart","submitted_at":"2014-07-09T09:36:53Z","abstract_excerpt":"Aims: We study single and binary white dwarfs in the inner halo of the Milky Way in order to learn more about the conditions under which the population of halo stars was born, such as the initial mass function (IMF), the star formation history, or the binary fraction. Methods: We simulate the evolution of low-metallicity halo stars at distances up to ~ 3 kpc using the binary population synthesis code SeBa. We use two different white dwarf cooling models to predict the present-day luminosities of halo white dwarfs. We determine the white dwarf luminosity functions (WDLFs) for eight different ha"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.2405","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":"2026-05-18T02:43:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"l5XsWXo+0frBmY4qHJmMjeFCoZiS4NDmgCQylrwelY1L/+KdCpn7bAes4uLqIkMU85XvCsjIlwI359AOl86GDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T17:59:31.140406Z"},"content_sha256":"408cc8650ae57242d001b81931cd59537946869a5ae58bcbabd00dd6a6c49b36","schema_version":"1.0","event_id":"sha256:408cc8650ae57242d001b81931cd59537946869a5ae58bcbabd00dd6a6c49b36"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V32K3A3JDRY2Y2SQTR42YXFMXW/bundle.json","state_url":"https://pith.science/pith/V32K3A3JDRY2Y2SQTR42YXFMXW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V32K3A3JDRY2Y2SQTR42YXFMXW/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":"2026-05-30T17:59:31Z","links":{"resolver":"https://pith.science/pith/V32K3A3JDRY2Y2SQTR42YXFMXW","bundle":"https://pith.science/pith/V32K3A3JDRY2Y2SQTR42YXFMXW/bundle.json","state":"https://pith.science/pith/V32K3A3JDRY2Y2SQTR42YXFMXW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V32K3A3JDRY2Y2SQTR42YXFMXW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:V32K3A3JDRY2Y2SQTR42YXFMXW","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":"1cf1f4713d2c79a02acd85ebcb48bfa12dac80d5c78838168d9de6272304121b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-07-09T09:36:53Z","title_canon_sha256":"945f2e89ce8422bae8fdbceed39623c4e6b72fea3f0e39da265e34faadf0c90e"},"schema_version":"1.0","source":{"id":"1407.2405","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.2405","created_at":"2026-05-18T02:43:46Z"},{"alias_kind":"arxiv_version","alias_value":"1407.2405v2","created_at":"2026-05-18T02:43:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.2405","created_at":"2026-05-18T02:43:46Z"},{"alias_kind":"pith_short_12","alias_value":"V32K3A3JDRY2","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"V32K3A3JDRY2Y2SQ","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"V32K3A3J","created_at":"2026-05-18T12:28:52Z"}],"graph_snapshots":[{"event_id":"sha256:408cc8650ae57242d001b81931cd59537946869a5ae58bcbabd00dd6a6c49b36","target":"graph","created_at":"2026-05-18T02:43:46Z","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":"Aims: We study single and binary white dwarfs in the inner halo of the Milky Way in order to learn more about the conditions under which the population of halo stars was born, such as the initial mass function (IMF), the star formation history, or the binary fraction. Methods: We simulate the evolution of low-metallicity halo stars at distances up to ~ 3 kpc using the binary population synthesis code SeBa. We use two different white dwarf cooling models to predict the present-day luminosities of halo white dwarfs. We determine the white dwarf luminosity functions (WDLFs) for eight different ha","authors_text":"Amina Helmi, Anthony G. A. Brown, Gijs Nelemans, Onno Pols, Pim van Oirschot, Silvia Toonen, Simon Portegies Zwart","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-07-09T09:36:53Z","title":"Binary white dwarfs in the halo of the Milky Way"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.2405","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:d274a2165e424901377704d452a29f4859d3c820282f619a3f5e5fbf998207bc","target":"record","created_at":"2026-05-18T02:43:46Z","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":"1cf1f4713d2c79a02acd85ebcb48bfa12dac80d5c78838168d9de6272304121b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-07-09T09:36:53Z","title_canon_sha256":"945f2e89ce8422bae8fdbceed39623c4e6b72fea3f0e39da265e34faadf0c90e"},"schema_version":"1.0","source":{"id":"1407.2405","kind":"arxiv","version":2}},"canonical_sha256":"aef4ad83691c71ac6a509c79ac5cacbda305d1dbdadca0780c56bc0b0049df0a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aef4ad83691c71ac6a509c79ac5cacbda305d1dbdadca0780c56bc0b0049df0a","first_computed_at":"2026-05-18T02:43:46.760092Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:43:46.760092Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5tjfG0ia2vtIj3RXvqqVO/JTGQXj12WRbMXSn0oym3L/XCcYDDzdeGq+AySB4VTYt5VUxgtJmxNjGT7j1J1VAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:43:46.760496Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.2405","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d274a2165e424901377704d452a29f4859d3c820282f619a3f5e5fbf998207bc","sha256:408cc8650ae57242d001b81931cd59537946869a5ae58bcbabd00dd6a6c49b36"],"state_sha256":"fdad0c37db1f9928adc23002aa969420f25cfb8675d5bf5fb47fff3a14478a59"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DhkMz6YYABNsIAci+jhx5Edjp2rezfIFfz/KP21qqTNDQvjciZRPXOjpnk1ieTaGoSkTzZJ7dSjimMpQQboQAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T17:59:31.144964Z","bundle_sha256":"d35de82a1f1716f669a62562039c03ff29d290134ad6c1162cdeade5d4405224"}}