{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:DW7WH6PAFI2W7VGYBKKMUDV55V","short_pith_number":"pith:DW7WH6PA","canonical_record":{"source":{"id":"0907.4990","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-07-28T20:10:51Z","cross_cats_sorted":[],"title_canon_sha256":"8f73479fe313f78d601ad305a7fca986e827b95476472149106953b2fb911cdc","abstract_canon_sha256":"a931951208cc52f0000ee89c9ceae6b23371c3be1549063b9c8f204e7667bc41"},"schema_version":"1.0"},"canonical_sha256":"1dbf63f9e02a356fd4d80a94ca0ebded7477e96f4b3b6d7585431cff7956e176","source":{"kind":"arxiv","id":"0907.4990","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.4990","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"arxiv_version","alias_value":"0907.4990v2","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.4990","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"pith_short_12","alias_value":"DW7WH6PAFI2W","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"DW7WH6PAFI2W7VGY","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"DW7WH6PA","created_at":"2026-05-18T12:25:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:DW7WH6PAFI2W7VGYBKKMUDV55V","target":"record","payload":{"canonical_record":{"source":{"id":"0907.4990","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-07-28T20:10:51Z","cross_cats_sorted":[],"title_canon_sha256":"8f73479fe313f78d601ad305a7fca986e827b95476472149106953b2fb911cdc","abstract_canon_sha256":"a931951208cc52f0000ee89c9ceae6b23371c3be1549063b9c8f204e7667bc41"},"schema_version":"1.0"},"canonical_sha256":"1dbf63f9e02a356fd4d80a94ca0ebded7477e96f4b3b6d7585431cff7956e176","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:12:46.917000Z","signature_b64":"j0Xhn6tiNN0wqMUb9WsOJJqirfWkPtkxMD7yvxrz/bRa1D5jqMvmYLCP7EQsSCOTlOKO7OgBnV1CKP82h5lOCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1dbf63f9e02a356fd4d80a94ca0ebded7477e96f4b3b6d7585431cff7956e176","last_reissued_at":"2026-05-18T02:12:46.916345Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:12:46.916345Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0907.4990","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":"2026-05-18T02:12:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eRVJFv9EUilcc439X3ALObNOEc1POUVHNNg36qBIqDDsib3ZIa8Z1wmo9okgkuMuDm6yTR/BOBSqyGgbec9ABQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T21:19:42.464180Z"},"content_sha256":"06de4b2937bdcca1945a7deb1cfd326b5b4f4f23df1486c8ba7a137cc36adef5","schema_version":"1.0","event_id":"sha256:06de4b2937bdcca1945a7deb1cfd326b5b4f4f23df1486c8ba7a137cc36adef5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:DW7WH6PAFI2W7VGYBKKMUDV55V","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Apparent Lack of Be X-ray Binaries with Black Holes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Janusz Ziolkowski, Krzysztof Belczynski","submitted_at":"2009-07-28T20:10:51Z","abstract_excerpt":"In the Galaxy there are 64 Be X-ray binaries known to-date. Out of those, 42 host a neutron star, and for the reminder the nature of a companion is not known. None, so far, is known to host a black hole. There seems to be no apparent mechanism that would prevent formation or detection of Be stars with black holes. This disparity is referred to as a missing Be -- black hole X-ray binary problem. We point out that current evolutionary scenarios that lead to the formation of Be X-ray binaries predict that the ratio of these binaries with neutron stars to the ones with black holes is rather high F"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.4990","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":"2026-05-18T02:12:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"k/jPGolSoTSP2rYyPYDKL8mtUlDaQVRplfcYkhRB/e1hVRQLvVdESq7u791N44GU9zac1YBoh5yWU+Qyx2DPDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T21:19:42.472872Z"},"content_sha256":"073a07953733420ab1c7b964deab416045cd481f3cda5a03e9ae3ca7fc9d902a","schema_version":"1.0","event_id":"sha256:073a07953733420ab1c7b964deab416045cd481f3cda5a03e9ae3ca7fc9d902a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DW7WH6PAFI2W7VGYBKKMUDV55V/bundle.json","state_url":"https://pith.science/pith/DW7WH6PAFI2W7VGYBKKMUDV55V/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DW7WH6PAFI2W7VGYBKKMUDV55V/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":"2026-06-06T21:19:42Z","links":{"resolver":"https://pith.science/pith/DW7WH6PAFI2W7VGYBKKMUDV55V","bundle":"https://pith.science/pith/DW7WH6PAFI2W7VGYBKKMUDV55V/bundle.json","state":"https://pith.science/pith/DW7WH6PAFI2W7VGYBKKMUDV55V/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DW7WH6PAFI2W7VGYBKKMUDV55V/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:DW7WH6PAFI2W7VGYBKKMUDV55V","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":"a931951208cc52f0000ee89c9ceae6b23371c3be1549063b9c8f204e7667bc41","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-07-28T20:10:51Z","title_canon_sha256":"8f73479fe313f78d601ad305a7fca986e827b95476472149106953b2fb911cdc"},"schema_version":"1.0","source":{"id":"0907.4990","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.4990","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"arxiv_version","alias_value":"0907.4990v2","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.4990","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"pith_short_12","alias_value":"DW7WH6PAFI2W","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"DW7WH6PAFI2W7VGY","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"DW7WH6PA","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:073a07953733420ab1c7b964deab416045cd481f3cda5a03e9ae3ca7fc9d902a","target":"graph","created_at":"2026-05-18T02:12:46Z","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":"In the Galaxy there are 64 Be X-ray binaries known to-date. Out of those, 42 host a neutron star, and for the reminder the nature of a companion is not known. None, so far, is known to host a black hole. There seems to be no apparent mechanism that would prevent formation or detection of Be stars with black holes. This disparity is referred to as a missing Be -- black hole X-ray binary problem. We point out that current evolutionary scenarios that lead to the formation of Be X-ray binaries predict that the ratio of these binaries with neutron stars to the ones with black holes is rather high F","authors_text":"Janusz Ziolkowski, Krzysztof Belczynski","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-07-28T20:10:51Z","title":"On the Apparent Lack of Be X-ray Binaries with Black Holes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.4990","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":"sha256:06de4b2937bdcca1945a7deb1cfd326b5b4f4f23df1486c8ba7a137cc36adef5","target":"record","created_at":"2026-05-18T02:12:46Z","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":"a931951208cc52f0000ee89c9ceae6b23371c3be1549063b9c8f204e7667bc41","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-07-28T20:10:51Z","title_canon_sha256":"8f73479fe313f78d601ad305a7fca986e827b95476472149106953b2fb911cdc"},"schema_version":"1.0","source":{"id":"0907.4990","kind":"arxiv","version":2}},"canonical_sha256":"1dbf63f9e02a356fd4d80a94ca0ebded7477e96f4b3b6d7585431cff7956e176","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1dbf63f9e02a356fd4d80a94ca0ebded7477e96f4b3b6d7585431cff7956e176","first_computed_at":"2026-05-18T02:12:46.916345Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:46.916345Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"j0Xhn6tiNN0wqMUb9WsOJJqirfWkPtkxMD7yvxrz/bRa1D5jqMvmYLCP7EQsSCOTlOKO7OgBnV1CKP82h5lOCg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:46.917000Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.4990","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:06de4b2937bdcca1945a7deb1cfd326b5b4f4f23df1486c8ba7a137cc36adef5","sha256:073a07953733420ab1c7b964deab416045cd481f3cda5a03e9ae3ca7fc9d902a"],"state_sha256":"0ac97c264b7a378ee38cce277482331ab83208f64f10d0aee580f0ef9e5a89f8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lJ/OXZk3dTacN5gxRnhg/rq8DDdTe+VsjNhsJUoKkXSndLgAlsO/uetvGYriaDs0viK3WbBkzZW64aN4/LjHBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T21:19:42.476189Z","bundle_sha256":"6cdf62ba6d7dc91b9373da938039796f94a343a203594de7c8e70653560861c1"}}