{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:SOTXRVK4VWFKK5KWA2M3WRNMMI","short_pith_number":"pith:SOTXRVK4","canonical_record":{"source":{"id":"2605.14264","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-05-14T02:08:14Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"7bcb9d11c5184035b271d8d0574acd1fde12bbf90a538865868b955ae20f394a","abstract_canon_sha256":"22ad526f2cadd70187bf71d4f8ad08f969fd2083350b7070b8ce725f19bcbc55"},"schema_version":"1.0"},"canonical_sha256":"93a778d55cad8aa575560699bb45ac6212704d59a63239b6601853ca35059e5c","source":{"kind":"arxiv","id":"2605.14264","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.14264","created_at":"2026-05-17T23:39:10Z"},{"alias_kind":"arxiv_version","alias_value":"2605.14264v1","created_at":"2026-05-17T23:39:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.14264","created_at":"2026-05-17T23:39:10Z"},{"alias_kind":"pith_short_12","alias_value":"SOTXRVK4VWFK","created_at":"2026-05-18T12:33:37Z"},{"alias_kind":"pith_short_16","alias_value":"SOTXRVK4VWFKK5KW","created_at":"2026-05-18T12:33:37Z"},{"alias_kind":"pith_short_8","alias_value":"SOTXRVK4","created_at":"2026-05-18T12:33:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:SOTXRVK4VWFKK5KWA2M3WRNMMI","target":"record","payload":{"canonical_record":{"source":{"id":"2605.14264","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-05-14T02:08:14Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"7bcb9d11c5184035b271d8d0574acd1fde12bbf90a538865868b955ae20f394a","abstract_canon_sha256":"22ad526f2cadd70187bf71d4f8ad08f969fd2083350b7070b8ce725f19bcbc55"},"schema_version":"1.0"},"canonical_sha256":"93a778d55cad8aa575560699bb45ac6212704d59a63239b6601853ca35059e5c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:39:10.456015Z","signature_b64":"6ZaDVNLyt4j31ztJL80J+AXoVpUk0VqrNSTQqj2S13x3ddHOcZv89qhRd0oEG6IW8Eoyh5bAPmtufEvp0ZbpCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"93a778d55cad8aa575560699bb45ac6212704d59a63239b6601853ca35059e5c","last_reissued_at":"2026-05-17T23:39:10.455548Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:39:10.455548Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.14264","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:39:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ocWnEV/aKlof8JYIpy669VHQ2HQvIKV7q3hXQ5cQa9pgD5sVQLcrS8HG/thUqtAciwSeovRZ/ayuTOvIHXrdAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T02:33:14.182628Z"},"content_sha256":"ae28e625c8fc7ff2965dbb1c03bdf3662811d8765a1f37393e6e93fba0653294","schema_version":"1.0","event_id":"sha256:ae28e625c8fc7ff2965dbb1c03bdf3662811d8765a1f37393e6e93fba0653294"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:SOTXRVK4VWFKK5KWA2M3WRNMMI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The compact neutron star in 4U 1746-37 revisited: Reassessing the mass and radius","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"Significant X-ray flux blocking allows the neutron star in 4U 1746-37 to match standard mass and radius values.","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"Chang-Hwan Lee, Kwang Hyun Sung, Kyujin Kwak, Myungkuk Kim, Young-Min Kim","submitted_at":"2026-05-14T02:08:14Z","abstract_excerpt":"A recent analysis of photospheric radius expansion X-ray bursts from the low-mass X-ray binary 4U 1746-37 reported unusually small mass and radius estimates for the neutron star, suggesting it could be a quark star or quark-cluster star. Here, we propose an alternative interpretation: the star's mass and radius could be underestimated from significant blocking of the X-ray flux. Significant blocking factors ($\\mathcal{B} \\gtrsim 0.8$, reducing the observed flux to $\\sim17\\%$ of the intrinsic emission) permit neutron star parameters consistent with the canonical values: $M = 1.59 \\pm 0.69 M_{\\o"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Significant blocking factors (B ≳ 0.8, reducing the observed flux to ∼17% of the intrinsic emission) permit neutron star parameters consistent with the canonical values: M = 1.59 ± 0.69 M⊙, R = 13.0 ± 5.45 km, or M = 2.12 ± 1.08 M⊙, R = 9.80 ± 4.13 km.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The assumption that significant flux blocking (B ≳ 0.8) occurs and varies with photospheric radius, thereby explaining the anomalously large peak-to-touchdown flux ratio of ∼2.0.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Significant X-ray flux blocking in 4U 1746-37 allows the neutron star to have canonical mass and radius values of 1.59 solar masses and 13 km or 2.12 solar masses and 9.8 km.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Significant X-ray flux blocking allows the neutron star in 4U 1746-37 to match standard mass and radius values.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"0247f6270a9377ffe0e79e2853956839a65fb732bc98551942258676e9d0a2bd"},"source":{"id":"2605.14264","kind":"arxiv","version":1},"verdict":{"id":"53ff4c22-1b6e-476c-8a86-9a2cc592e8b8","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T02:18:19.479243Z","strongest_claim":"Significant blocking factors (B ≳ 0.8, reducing the observed flux to ∼17% of the intrinsic emission) permit neutron star parameters consistent with the canonical values: M = 1.59 ± 0.69 M⊙, R = 13.0 ± 5.45 km, or M = 2.12 ± 1.08 M⊙, R = 9.80 ± 4.13 km.","one_line_summary":"Significant X-ray flux blocking in 4U 1746-37 allows the neutron star to have canonical mass and radius values of 1.59 solar masses and 13 km or 2.12 solar masses and 9.8 km.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The assumption that significant flux blocking (B ≳ 0.8) occurs and varies with photospheric radius, thereby explaining the anomalously large peak-to-touchdown flux ratio of ∼2.0.","pith_extraction_headline":"Significant X-ray flux blocking allows the neutron star in 4U 1746-37 to match standard mass and radius values."},"references":{"count":114,"sample":[{"doi":"","year":2013,"title":"Antoniadis, J. et al. 2013, Science, 340, 6131","work_id":"5f4a3420-fd7d-4118-bd88-d6f093bf6485","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1934,"title":"& Zwicky , F","work_id":"7a8e8670-53ee-448a-b683-be44ae2cad09","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2009,"title":"2009, , 138, 50","work_id":"e8742929-3175-4e62-85a2-129e5462ec01","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2004,"title":"J., & Smale , A","work_id":"7ed0061d-25d5-4467-b0b0-539c6d6a4889","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1971,"title":"1971, , 170, 299","work_id":"dd3f77af-4cef-4a43-b0a4-d31364fae201","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":114,"snapshot_sha256":"c48880927c5110ecafebbd00fc178b3d0b71ebfe908ead91c75be974166e9562","internal_anchors":32},"formal_canon":{"evidence_count":2,"snapshot_sha256":"13644812d925b4a3df7ccf93d8b84704a6c7e5858f143c1530ff66f91dba140c"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":"53ff4c22-1b6e-476c-8a86-9a2cc592e8b8"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:39:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4Ziq0h9siGgRawmeFCsd+myy0Pfpmx9Cdy+kkx4IAVGRFxLbfMhyYnnvYJukXbNU260nNSS6HLosXroLprivBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T02:33:14.183237Z"},"content_sha256":"93946298dfc02b86650c4c011c9c7f27d253e639a807bd65368f6e0683456745","schema_version":"1.0","event_id":"sha256:93946298dfc02b86650c4c011c9c7f27d253e639a807bd65368f6e0683456745"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SOTXRVK4VWFKK5KWA2M3WRNMMI/bundle.json","state_url":"https://pith.science/pith/SOTXRVK4VWFKK5KWA2M3WRNMMI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SOTXRVK4VWFKK5KWA2M3WRNMMI/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":"2026-05-28T02:33:14Z","links":{"resolver":"https://pith.science/pith/SOTXRVK4VWFKK5KWA2M3WRNMMI","bundle":"https://pith.science/pith/SOTXRVK4VWFKK5KWA2M3WRNMMI/bundle.json","state":"https://pith.science/pith/SOTXRVK4VWFKK5KWA2M3WRNMMI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SOTXRVK4VWFKK5KWA2M3WRNMMI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:SOTXRVK4VWFKK5KWA2M3WRNMMI","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":"22ad526f2cadd70187bf71d4f8ad08f969fd2083350b7070b8ce725f19bcbc55","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-05-14T02:08:14Z","title_canon_sha256":"7bcb9d11c5184035b271d8d0574acd1fde12bbf90a538865868b955ae20f394a"},"schema_version":"1.0","source":{"id":"2605.14264","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.14264","created_at":"2026-05-17T23:39:10Z"},{"alias_kind":"arxiv_version","alias_value":"2605.14264v1","created_at":"2026-05-17T23:39:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.14264","created_at":"2026-05-17T23:39:10Z"},{"alias_kind":"pith_short_12","alias_value":"SOTXRVK4VWFK","created_at":"2026-05-18T12:33:37Z"},{"alias_kind":"pith_short_16","alias_value":"SOTXRVK4VWFKK5KW","created_at":"2026-05-18T12:33:37Z"},{"alias_kind":"pith_short_8","alias_value":"SOTXRVK4","created_at":"2026-05-18T12:33:37Z"}],"graph_snapshots":[{"event_id":"sha256:93946298dfc02b86650c4c011c9c7f27d253e639a807bd65368f6e0683456745","target":"graph","created_at":"2026-05-17T23:39:10Z","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":4,"items":[{"attestation":"unclaimed","claim_id":"C1","kind":"strongest_claim","source":"verdict.strongest_claim","status":"machine_extracted","text":"Significant blocking factors (B ≳ 0.8, reducing the observed flux to ∼17% of the intrinsic emission) permit neutron star parameters consistent with the canonical values: M = 1.59 ± 0.69 M⊙, R = 13.0 ± 5.45 km, or M = 2.12 ± 1.08 M⊙, R = 9.80 ± 4.13 km."},{"attestation":"unclaimed","claim_id":"C2","kind":"weakest_assumption","source":"verdict.weakest_assumption","status":"machine_extracted","text":"The assumption that significant flux blocking (B ≳ 0.8) occurs and varies with photospheric radius, thereby explaining the anomalously large peak-to-touchdown flux ratio of ∼2.0."},{"attestation":"unclaimed","claim_id":"C3","kind":"one_line_summary","source":"verdict.one_line_summary","status":"machine_extracted","text":"Significant X-ray flux blocking in 4U 1746-37 allows the neutron star to have canonical mass and radius values of 1.59 solar masses and 13 km or 2.12 solar masses and 9.8 km."},{"attestation":"unclaimed","claim_id":"C4","kind":"headline","source":"verdict.pith_extraction.headline","status":"machine_extracted","text":"Significant X-ray flux blocking allows the neutron star in 4U 1746-37 to match standard mass and radius values."}],"snapshot_sha256":"0247f6270a9377ffe0e79e2853956839a65fb732bc98551942258676e9d0a2bd"},"formal_canon":{"evidence_count":2,"snapshot_sha256":"13644812d925b4a3df7ccf93d8b84704a6c7e5858f143c1530ff66f91dba140c"},"paper":{"abstract_excerpt":"A recent analysis of photospheric radius expansion X-ray bursts from the low-mass X-ray binary 4U 1746-37 reported unusually small mass and radius estimates for the neutron star, suggesting it could be a quark star or quark-cluster star. Here, we propose an alternative interpretation: the star's mass and radius could be underestimated from significant blocking of the X-ray flux. Significant blocking factors ($\\mathcal{B} \\gtrsim 0.8$, reducing the observed flux to $\\sim17\\%$ of the intrinsic emission) permit neutron star parameters consistent with the canonical values: $M = 1.59 \\pm 0.69 M_{\\o","authors_text":"Chang-Hwan Lee, Kwang Hyun Sung, Kyujin Kwak, Myungkuk Kim, Young-Min Kim","cross_cats":["astro-ph.SR"],"headline":"Significant X-ray flux blocking allows the neutron star in 4U 1746-37 to match standard mass and radius values.","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-05-14T02:08:14Z","title":"The compact neutron star in 4U 1746-37 revisited: Reassessing the mass and radius"},"references":{"count":114,"internal_anchors":32,"resolved_work":114,"sample":[{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":1,"title":"Antoniadis, J. et al. 2013, Science, 340, 6131","work_id":"5f4a3420-fd7d-4118-bd88-d6f093bf6485","year":2013},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":2,"title":"& Zwicky , F","work_id":"7a8e8670-53ee-448a-b683-be44ae2cad09","year":1934},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":3,"title":"2009, , 138, 50","work_id":"e8742929-3175-4e62-85a2-129e5462ec01","year":2009},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":4,"title":"J., & Smale , A","work_id":"7ed0061d-25d5-4467-b0b0-539c6d6a4889","year":2004},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":5,"title":"1971, , 170, 299","work_id":"dd3f77af-4cef-4a43-b0a4-d31364fae201","year":1971}],"snapshot_sha256":"c48880927c5110ecafebbd00fc178b3d0b71ebfe908ead91c75be974166e9562"},"source":{"id":"2605.14264","kind":"arxiv","version":1},"verdict":{"created_at":"2026-05-15T02:18:19.479243Z","id":"53ff4c22-1b6e-476c-8a86-9a2cc592e8b8","model_set":{"reader":"grok-4.3"},"one_line_summary":"Significant X-ray flux blocking in 4U 1746-37 allows the neutron star to have canonical mass and radius values of 1.59 solar masses and 13 km or 2.12 solar masses and 9.8 km.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"Significant X-ray flux blocking allows the neutron star in 4U 1746-37 to match standard mass and radius values.","strongest_claim":"Significant blocking factors (B ≳ 0.8, reducing the observed flux to ∼17% of the intrinsic emission) permit neutron star parameters consistent with the canonical values: M = 1.59 ± 0.69 M⊙, R = 13.0 ± 5.45 km, or M = 2.12 ± 1.08 M⊙, R = 9.80 ± 4.13 km.","weakest_assumption":"The assumption that significant flux blocking (B ≳ 0.8) occurs and varies with photospheric radius, thereby explaining the anomalously large peak-to-touchdown flux ratio of ∼2.0."}},"verdict_id":"53ff4c22-1b6e-476c-8a86-9a2cc592e8b8"}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:ae28e625c8fc7ff2965dbb1c03bdf3662811d8765a1f37393e6e93fba0653294","target":"record","created_at":"2026-05-17T23:39:10Z","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":"22ad526f2cadd70187bf71d4f8ad08f969fd2083350b7070b8ce725f19bcbc55","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-05-14T02:08:14Z","title_canon_sha256":"7bcb9d11c5184035b271d8d0574acd1fde12bbf90a538865868b955ae20f394a"},"schema_version":"1.0","source":{"id":"2605.14264","kind":"arxiv","version":1}},"canonical_sha256":"93a778d55cad8aa575560699bb45ac6212704d59a63239b6601853ca35059e5c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"93a778d55cad8aa575560699bb45ac6212704d59a63239b6601853ca35059e5c","first_computed_at":"2026-05-17T23:39:10.455548Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:39:10.455548Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6ZaDVNLyt4j31ztJL80J+AXoVpUk0VqrNSTQqj2S13x3ddHOcZv89qhRd0oEG6IW8Eoyh5bAPmtufEvp0ZbpCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:39:10.456015Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.14264","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ae28e625c8fc7ff2965dbb1c03bdf3662811d8765a1f37393e6e93fba0653294","sha256:93946298dfc02b86650c4c011c9c7f27d253e639a807bd65368f6e0683456745"],"state_sha256":"da61060e5b9a08b89124e0f8f9d5354f05b5030e454919f7df1203c6fda5ce80"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"27UqLR2Gwl/X/WBAwRkz76VwNRnuvI604nVb03P7YIQWeEPNSMfjwNNRnpsAHh/VnPhFhti073BhSQy4zcaBCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T02:33:14.185921Z","bundle_sha256":"cde9af0ba3244db05ae44de6c58b59536ed9b2dfee47dde8dd69aeebe8a6b17e"}}