{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:R6X4IM64R2NJCOMHUXB3GGPX7Y","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":"df46024f3dee8c202e99da0acfd04ff960843c8a603bbe3be02a454d022677e1","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-25T05:55:07Z","title_canon_sha256":"55c713ffade5deea8761f93974780621c4f444cedb45bce57ddd2aa301ccc227"},"schema_version":"1.0","source":{"id":"1807.09442","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.09442","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"arxiv_version","alias_value":"1807.09442v1","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.09442","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"pith_short_12","alias_value":"R6X4IM64R2NJ","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"R6X4IM64R2NJCOMH","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"R6X4IM64","created_at":"2026-05-18T12:32:50Z"}],"graph_snapshots":[{"event_id":"sha256:10c0322cbc09e1cbbb2906fc53a6604b4ba259eaabb3a7fcd26ea2f34fc5ea72","target":"graph","created_at":"2026-05-18T00:08:37Z","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 report detection of the binary companion to the millisecond pulsar J2302+4442 based on the deep observations performed with the Gran Telescopio Canarias. The observations revealed an optical source with $r'$ = 23.33$\\pm$0.02 and $i'$=23.08$\\pm$0.02, whose position coincides with the pulsar radio position. By comparing the source colour and magnitudes with the white dwarf cooling predictions, we found that it likely represents a He or CO-core white dwarf and estimated its mass of 0.52$^{+0.25}_{-0.19}$ M$_{\\odot}$ and effective temperature of 6300$^{+1000}_{-800}$ K. Combining our results wi","authors_text":"A. Cabrera-Lavers, A. V. Karpova, A. Yu. Kirichenko, D. A. Zyuzin, S. Dai, S. V. Zharikov, Yu. A. Shibanov","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-25T05:55:07Z","title":"Optical identification of the binary companion to the millisecond PSR J2302+4442 with the Gran Telescopio Canarias"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.09442","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:e2288143152441d7ebdd30397b47b44df6615e252339ec8ebd2b651f2ebb789f","target":"record","created_at":"2026-05-18T00:08:37Z","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":"df46024f3dee8c202e99da0acfd04ff960843c8a603bbe3be02a454d022677e1","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-25T05:55:07Z","title_canon_sha256":"55c713ffade5deea8761f93974780621c4f444cedb45bce57ddd2aa301ccc227"},"schema_version":"1.0","source":{"id":"1807.09442","kind":"arxiv","version":1}},"canonical_sha256":"8fafc433dc8e9a913987a5c3b319f7fe1c37e07780673d08fc58524e4d61f967","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8fafc433dc8e9a913987a5c3b319f7fe1c37e07780673d08fc58524e4d61f967","first_computed_at":"2026-05-18T00:08:37.858765Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:08:37.858765Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"11wcRH7gQFo1NTIQOGJO+6KJSg2f3tayq/l4S9xkl6vW2nOY5Y3dub+mWk+C1ar6KYUdUa79AnkWMSwJOZQTBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:08:37.859491Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.09442","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e2288143152441d7ebdd30397b47b44df6615e252339ec8ebd2b651f2ebb789f","sha256:10c0322cbc09e1cbbb2906fc53a6604b4ba259eaabb3a7fcd26ea2f34fc5ea72"],"state_sha256":"8b0b26044e241dd5cee05159e1ff4002bb9580e7983822d1d83459f996b3c0c3"}