{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:FCJGT7DQJ22Y4GIPRXCGC6AM3M","short_pith_number":"pith:FCJGT7DQ","canonical_record":{"source":{"id":"1909.05606","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-09-12T12:41:09Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"8bd88b53a5574639e7393b339a25f21ef20a5f9f93436d9d91896f203113ef45","abstract_canon_sha256":"ea4afc11b2d95cc11e93fca15b7bf6a3f0ee92a5a361a7b67d0b0f7b9d5c0bff"},"schema_version":"1.0"},"canonical_sha256":"289269fc704eb58e190f8dc461780cdb3d1d708acab1a1928066081f1de37a01","source":{"kind":"arxiv","id":"1909.05606","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.05606","created_at":"2026-07-05T00:23:24Z"},{"alias_kind":"arxiv_version","alias_value":"1909.05606v1","created_at":"2026-07-05T00:23:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.05606","created_at":"2026-07-05T00:23:24Z"},{"alias_kind":"pith_short_12","alias_value":"FCJGT7DQJ22Y","created_at":"2026-07-05T00:23:24Z"},{"alias_kind":"pith_short_16","alias_value":"FCJGT7DQJ22Y4GIP","created_at":"2026-07-05T00:23:24Z"},{"alias_kind":"pith_short_8","alias_value":"FCJGT7DQ","created_at":"2026-07-05T00:23:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:FCJGT7DQJ22Y4GIPRXCGC6AM3M","target":"record","payload":{"canonical_record":{"source":{"id":"1909.05606","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-09-12T12:41:09Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"8bd88b53a5574639e7393b339a25f21ef20a5f9f93436d9d91896f203113ef45","abstract_canon_sha256":"ea4afc11b2d95cc11e93fca15b7bf6a3f0ee92a5a361a7b67d0b0f7b9d5c0bff"},"schema_version":"1.0"},"canonical_sha256":"289269fc704eb58e190f8dc461780cdb3d1d708acab1a1928066081f1de37a01","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:23:24.049641Z","signature_b64":"MwSCQ4G6OTwLbPqzi948C6mgdOgyYaRGEcJaQJuB7QVU2/K8UK4gV0NsYkRqFE2LLHxAh/P2x2tK7RKN7ZtrDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"289269fc704eb58e190f8dc461780cdb3d1d708acab1a1928066081f1de37a01","last_reissued_at":"2026-07-05T00:23:24.049130Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:23:24.049130Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.05606","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":"2026-07-05T00:23:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UHdt1o2UDyHG4gZzKtmJrq/XpVePpAICOxOeGVn25xfRxipce52GIm0E5lcxJCRRY8PvON7e2G/32fy3cpIZAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T11:01:58.847215Z"},"content_sha256":"bfd9212d9051cf4a0dafda88740ca9ac531c83e0783dd191f5c3aa9378b0c45b","schema_version":"1.0","event_id":"sha256:bfd9212d9051cf4a0dafda88740ca9ac531c83e0783dd191f5c3aa9378b0c45b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:FCJGT7DQJ22Y4GIPRXCGC6AM3M","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Weighing the Darkness: Astrometric Mass Measurement of Hidden Stellar Companions using Gaia","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.SR","authors_text":"Jeff J. Andrews, Katelyn Breivik, Sourav Chatterjee","submitted_at":"2019-09-12T12:41:09Z","abstract_excerpt":"In astrometric binaries, the presence of a dark, unseen star can be inferred from the gravitational pull it induces on its luminous binary companion. While the orbit of such binaries can be characterized with precise astrometric measurements, constraints made from astrometry alone are not enough to measure the component masses. In this work, we determine the precision with which Gaia can astrometrically measure the orbits and -- with additional observations -- the component masses, for luminous stars hosting hidden companions. Using realistic mock Gaia observations, we find that Gaia can preci"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.05606","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1909.05606/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:23:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BFYeN3Hgp5RG+01jfrUeviE/7CufSFWtYVwAR7iEW6g+UBSfLgDcTvt+TUiJxocjE+fFeHXacdxLIqiwEKBfDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T11:01:58.847725Z"},"content_sha256":"a5f29500b794612461660b0095be62a246063b6a1a6c1b92385a33eaf163bf48","schema_version":"1.0","event_id":"sha256:a5f29500b794612461660b0095be62a246063b6a1a6c1b92385a33eaf163bf48"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FCJGT7DQJ22Y4GIPRXCGC6AM3M/bundle.json","state_url":"https://pith.science/pith/FCJGT7DQJ22Y4GIPRXCGC6AM3M/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FCJGT7DQJ22Y4GIPRXCGC6AM3M/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":"2026-08-12T11:01:58Z","links":{"resolver":"https://pith.science/pith/FCJGT7DQJ22Y4GIPRXCGC6AM3M","bundle":"https://pith.science/pith/FCJGT7DQJ22Y4GIPRXCGC6AM3M/bundle.json","state":"https://pith.science/pith/FCJGT7DQJ22Y4GIPRXCGC6AM3M/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FCJGT7DQJ22Y4GIPRXCGC6AM3M/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:FCJGT7DQJ22Y4GIPRXCGC6AM3M","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":"ea4afc11b2d95cc11e93fca15b7bf6a3f0ee92a5a361a7b67d0b0f7b9d5c0bff","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-09-12T12:41:09Z","title_canon_sha256":"8bd88b53a5574639e7393b339a25f21ef20a5f9f93436d9d91896f203113ef45"},"schema_version":"1.0","source":{"id":"1909.05606","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.05606","created_at":"2026-07-05T00:23:24Z"},{"alias_kind":"arxiv_version","alias_value":"1909.05606v1","created_at":"2026-07-05T00:23:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.05606","created_at":"2026-07-05T00:23:24Z"},{"alias_kind":"pith_short_12","alias_value":"FCJGT7DQJ22Y","created_at":"2026-07-05T00:23:24Z"},{"alias_kind":"pith_short_16","alias_value":"FCJGT7DQJ22Y4GIP","created_at":"2026-07-05T00:23:24Z"},{"alias_kind":"pith_short_8","alias_value":"FCJGT7DQ","created_at":"2026-07-05T00:23:24Z"}],"graph_snapshots":[{"event_id":"sha256:a5f29500b794612461660b0095be62a246063b6a1a6c1b92385a33eaf163bf48","target":"graph","created_at":"2026-07-05T00:23:24Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1909.05606/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In astrometric binaries, the presence of a dark, unseen star can be inferred from the gravitational pull it induces on its luminous binary companion. While the orbit of such binaries can be characterized with precise astrometric measurements, constraints made from astrometry alone are not enough to measure the component masses. In this work, we determine the precision with which Gaia can astrometrically measure the orbits and -- with additional observations -- the component masses, for luminous stars hosting hidden companions. Using realistic mock Gaia observations, we find that Gaia can preci","authors_text":"Jeff J. Andrews, Katelyn Breivik, Sourav Chatterjee","cross_cats":["astro-ph.EP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-09-12T12:41:09Z","title":"Weighing the Darkness: Astrometric Mass Measurement of Hidden Stellar Companions using Gaia"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.05606","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:bfd9212d9051cf4a0dafda88740ca9ac531c83e0783dd191f5c3aa9378b0c45b","target":"record","created_at":"2026-07-05T00:23:24Z","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":"ea4afc11b2d95cc11e93fca15b7bf6a3f0ee92a5a361a7b67d0b0f7b9d5c0bff","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-09-12T12:41:09Z","title_canon_sha256":"8bd88b53a5574639e7393b339a25f21ef20a5f9f93436d9d91896f203113ef45"},"schema_version":"1.0","source":{"id":"1909.05606","kind":"arxiv","version":1}},"canonical_sha256":"289269fc704eb58e190f8dc461780cdb3d1d708acab1a1928066081f1de37a01","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"289269fc704eb58e190f8dc461780cdb3d1d708acab1a1928066081f1de37a01","first_computed_at":"2026-07-05T00:23:24.049130Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:23:24.049130Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MwSCQ4G6OTwLbPqzi948C6mgdOgyYaRGEcJaQJuB7QVU2/K8UK4gV0NsYkRqFE2LLHxAh/P2x2tK7RKN7ZtrDA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:23:24.049641Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.05606","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bfd9212d9051cf4a0dafda88740ca9ac531c83e0783dd191f5c3aa9378b0c45b","sha256:a5f29500b794612461660b0095be62a246063b6a1a6c1b92385a33eaf163bf48"],"state_sha256":"3a05fc64a22087fe85e5e0f553d062e31f53d26fc4c1de090a3d5550c0865f8d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z+A68a83JQi5joA9LxjtK0lFknb6/J64Y+Ec5nBKUy+iolWM7vF9y+EMpFHu31sXw5dzoVneW6336RI0c/MSDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-12T11:01:58.851464Z","bundle_sha256":"f6248876d9231f4cf56500b3a32a145b7a40db878f64ffa589650075ed6cf5c0"}}