{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:UHGH5WBFSSUCUTMFHLFOLSW2BE","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":"68d9b09ea3d32f95b49ca3dfbc94f46971777f2066678371ab940e0a36645854","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-12-07T15:50:11Z","title_canon_sha256":"c1f42a1287c584ac8c21b81db698ffb79185ae8679d79a74677fc865e57f37d5"},"schema_version":"1.0","source":{"id":"2112.03779","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.03779","created_at":"2026-07-05T03:38:49Z"},{"alias_kind":"arxiv_version","alias_value":"2112.03779v1","created_at":"2026-07-05T03:38:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.03779","created_at":"2026-07-05T03:38:49Z"},{"alias_kind":"pith_short_12","alias_value":"UHGH5WBFSSUC","created_at":"2026-07-05T03:38:49Z"},{"alias_kind":"pith_short_16","alias_value":"UHGH5WBFSSUCUTMF","created_at":"2026-07-05T03:38:49Z"},{"alias_kind":"pith_short_8","alias_value":"UHGH5WBF","created_at":"2026-07-05T03:38:49Z"}],"graph_snapshots":[{"event_id":"sha256:e801d58ff17394bc2c2062889531e8aeb129d9afa3a0ec55e11cd28790d6f587","target":"graph","created_at":"2026-07-05T03:38:49Z","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/2112.03779/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Bachetti et al. (2021) have recently claimed to measure the mass transfer rate in the pulsing ULX system M82 X-2 by following the change of its orbital period over 7 yr. We reiterate the known point that this method cannot give a reliable result (or even necessarily predict the correct sign of long-term period change) without a far longer baseline (here $\\gg 1000$~yr) or for systems with a much higher long-term mass transfer rate ($\\gg 10^{-4} \\rm M_{\\odot}/{\\rm yr}$), if they exist. Applying the method of Bachetti et al. (2021) to measured orbital period derivatives predicts that the well-stu","authors_text":"Andrew King, Jean-Pierre Lasota","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-12-07T15:50:11Z","title":"One for the Future: measuring the mass transfer rate in the ULX M82 X-2 by using orbital period changes will take millenia"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.03779","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":"sha256:5b4f933c0e17cf4007c9b4130edad4d6457ee98203335e6dff3ecf201ebed1db","target":"record","created_at":"2026-07-05T03:38:49Z","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":"68d9b09ea3d32f95b49ca3dfbc94f46971777f2066678371ab940e0a36645854","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-12-07T15:50:11Z","title_canon_sha256":"c1f42a1287c584ac8c21b81db698ffb79185ae8679d79a74677fc865e57f37d5"},"schema_version":"1.0","source":{"id":"2112.03779","kind":"arxiv","version":1}},"canonical_sha256":"a1cc7ed82594a82a4d853acae5cada0909946851212a2654a21fa54688d3585a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a1cc7ed82594a82a4d853acae5cada0909946851212a2654a21fa54688d3585a","first_computed_at":"2026-07-05T03:38:49.586140Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:38:49.586140Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Xy5+2IMZd4KVASI3s1s3h6pClJ95XG58IDoVgmPVKlqQET5dAdZXkaYXNi+gdWmSWFeoVwax2n0BQEHBAAesDA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:38:49.586562Z","signed_message":"canonical_sha256_bytes"},"source_id":"2112.03779","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5b4f933c0e17cf4007c9b4130edad4d6457ee98203335e6dff3ecf201ebed1db","sha256:e801d58ff17394bc2c2062889531e8aeb129d9afa3a0ec55e11cd28790d6f587"],"state_sha256":"177285b9e9fe273c7c7f9280ffcf397451c8d52ac7acf66bebe38160825eb981"}