{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:MJ5IAXHZ4FA3NILZH72JJRYTOZ","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":"6a36402655bf06b89d229267b45b88f82cde6617153319eb8569b81a2afa89b6","cross_cats_sorted":["astro-ph.HE"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2023-06-21T18:00:00Z","title_canon_sha256":"8e9f1f96cb81f8fe6f5fe0e818965f19a746d1b49c60e14a85c45714da749137"},"schema_version":"1.0","source":{"id":"2306.12468","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2306.12468","created_at":"2026-07-05T06:56:34Z"},{"alias_kind":"arxiv_version","alias_value":"2306.12468v2","created_at":"2026-07-05T06:56:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2306.12468","created_at":"2026-07-05T06:56:34Z"},{"alias_kind":"pith_short_12","alias_value":"MJ5IAXHZ4FA3","created_at":"2026-07-05T06:56:34Z"},{"alias_kind":"pith_short_16","alias_value":"MJ5IAXHZ4FA3NILZ","created_at":"2026-07-05T06:56:34Z"},{"alias_kind":"pith_short_8","alias_value":"MJ5IAXHZ","created_at":"2026-07-05T06:56:34Z"}],"graph_snapshots":[{"event_id":"sha256:de3d976b96e3a589cd2ebdac14247b2dadfeb9b67636dd96758edd2bac550683","target":"graph","created_at":"2026-07-05T06:56:34Z","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/2306.12468/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"While gravitational wave (GW) standard sirens from neutron star (NS) mergers have been proposed to offer good measurements of the Hubble constant, we show in this paper how a variation of the expanding photosphere method (EPM) or spectral-fitting expanding atmosphere method, applied to the kilonovae (KNe) associated with the mergers, can provide an independent distance measurement to individual mergers that is potentially accurate to within a few percent. There are four reasons why the KN-EPM overcomes the major uncertainties commonly associated with this method in supernovae: 1) the early con","authors_text":"Albert Sneppen, Andreas Bauswein, Darach Watson, Dovi Poznanski, Oliver Just, Rados{\\l}aw Wojtak","cross_cats":["astro-ph.HE"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2023-06-21T18:00:00Z","title":"Measuring the Hubble constant with kilonovae using the Expanding Photosphere Method"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2306.12468","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:b5c250e07a9aa2c7d682dd1bdaa189925309786469bf6e6ea6fdcbecc83b1e0f","target":"record","created_at":"2026-07-05T06:56:34Z","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":"6a36402655bf06b89d229267b45b88f82cde6617153319eb8569b81a2afa89b6","cross_cats_sorted":["astro-ph.HE"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2023-06-21T18:00:00Z","title_canon_sha256":"8e9f1f96cb81f8fe6f5fe0e818965f19a746d1b49c60e14a85c45714da749137"},"schema_version":"1.0","source":{"id":"2306.12468","kind":"arxiv","version":2}},"canonical_sha256":"627a805cf9e141b6a1793ff494c71376509511bfd00578800262d6c945f0ac3c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"627a805cf9e141b6a1793ff494c71376509511bfd00578800262d6c945f0ac3c","first_computed_at":"2026-07-05T06:56:34.823246Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:56:34.823246Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"B+SqONu1jLvpb4LZEX1g4L+mzZKnup/99FwVULujrc+bz29EZ8mlac5XDCfbEjrMTFndrc+SWcXaGaWuRxEpBw==","signature_status":"signed_v1","signed_at":"2026-07-05T06:56:34.823724Z","signed_message":"canonical_sha256_bytes"},"source_id":"2306.12468","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b5c250e07a9aa2c7d682dd1bdaa189925309786469bf6e6ea6fdcbecc83b1e0f","sha256:de3d976b96e3a589cd2ebdac14247b2dadfeb9b67636dd96758edd2bac550683"],"state_sha256":"503ae408e9e5ed80ac731646c991e6acbff5ecdc7c16b0790ac4211434ffa163"}