{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:HB4KSEIDMJ4KFLMRCFTCIGNXOJ","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":"86005869c74e0c1f7cfb709318d75fcaa7566a135ac49051ba0acc32a6b02867","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-10-13T09:59:19Z","title_canon_sha256":"7dc858bd4388ba1d41166ff7a5240d0adafc14e51173223abd445463852d018a"},"schema_version":"1.0","source":{"id":"1510.03609","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.03609","created_at":"2026-05-18T01:26:41Z"},{"alias_kind":"arxiv_version","alias_value":"1510.03609v1","created_at":"2026-05-18T01:26:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.03609","created_at":"2026-05-18T01:26:41Z"},{"alias_kind":"pith_short_12","alias_value":"HB4KSEIDMJ4K","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"HB4KSEIDMJ4KFLMR","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"HB4KSEID","created_at":"2026-05-18T12:29:22Z"}],"graph_snapshots":[{"event_id":"sha256:7836c6d4bcbca817b04997a50e8e367388838d6954740ae66cedef0c800eb79e","target":"graph","created_at":"2026-05-18T01:26:41Z","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":"We present multi-epoch spectroscopic observations of the massive binary system WR21a, which include the January 2011 periastron passage. Our spectra reveal multiple SB2 lines and facilitate an accurate determination of the orbit and the spectral types of the components. We obtain minimum masses of $64.4\\pm4.8 \\ M_{\\odot}$ and $36.3\\pm1.7 \\ M_{\\odot}$ for the two components of WR21a. Using disentangled spectra of the individual components, we derive spectral types of O3/WN5ha and O3Vz~((f*)) for the primary and secondary, respectively. Using the spectral type of the secondary as an indication f","authors_text":"A. de Koter, A. Moffat, F. Tramper, H. Sana, L. Kaper, L. Mahy, N.E. Fitzsimons","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-10-13T09:59:19Z","title":"The mass of the very massive binary WR21a"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.03609","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":"sha256:815b9d6da2a651d3b7960ee7d55746135fb0e290368f16d7cc82210080500e84","target":"record","created_at":"2026-05-18T01:26:41Z","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":"86005869c74e0c1f7cfb709318d75fcaa7566a135ac49051ba0acc32a6b02867","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-10-13T09:59:19Z","title_canon_sha256":"7dc858bd4388ba1d41166ff7a5240d0adafc14e51173223abd445463852d018a"},"schema_version":"1.0","source":{"id":"1510.03609","kind":"arxiv","version":1}},"canonical_sha256":"3878a911036278a2ad9111662419b77259145f6294521d50c6bc5e7f49c1a3b0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3878a911036278a2ad9111662419b77259145f6294521d50c6bc5e7f49c1a3b0","first_computed_at":"2026-05-18T01:26:41.008215Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:26:41.008215Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tFn9IwtfR9+Xl9ydpbYv7H7a9jmsHuD+HrGOOizbJ+0bQ12VVJc/H9zLyYyX0k0YrPl+4pnO+132AD9OFtxBAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:26:41.008883Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.03609","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:815b9d6da2a651d3b7960ee7d55746135fb0e290368f16d7cc82210080500e84","sha256:7836c6d4bcbca817b04997a50e8e367388838d6954740ae66cedef0c800eb79e"],"state_sha256":"4787e2c96f6caa957ab8d9df6a698e71d13eb89e4b71cc81ab21f2e3e72ef449"}