{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:TNITZKZFUISAGJA6VV3FMTQ2SD","short_pith_number":"pith:TNITZKZF","canonical_record":{"source":{"id":"2006.14688","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2020-06-25T20:35:36Z","cross_cats_sorted":[],"title_canon_sha256":"c4ff867679c233ee218cff7880d2e131f2051ee629b4d976a2901d48cf2ea8a8","abstract_canon_sha256":"7e9f65a683e4da320161b1ac26cbb4338f54353a2a965f6f2208152ff07a38cc"},"schema_version":"1.0"},"canonical_sha256":"9b513cab25a22403241ead76564e1a90fff1f79cb03a6c96b94e283adef8be02","source":{"kind":"arxiv","id":"2006.14688","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2006.14688","created_at":"2026-07-05T01:13:35Z"},{"alias_kind":"arxiv_version","alias_value":"2006.14688v1","created_at":"2026-07-05T01:13:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2006.14688","created_at":"2026-07-05T01:13:35Z"},{"alias_kind":"pith_short_12","alias_value":"TNITZKZFUISA","created_at":"2026-07-05T01:13:35Z"},{"alias_kind":"pith_short_16","alias_value":"TNITZKZFUISAGJA6","created_at":"2026-07-05T01:13:35Z"},{"alias_kind":"pith_short_8","alias_value":"TNITZKZF","created_at":"2026-07-05T01:13:35Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:TNITZKZFUISAGJA6VV3FMTQ2SD","target":"record","payload":{"canonical_record":{"source":{"id":"2006.14688","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2020-06-25T20:35:36Z","cross_cats_sorted":[],"title_canon_sha256":"c4ff867679c233ee218cff7880d2e131f2051ee629b4d976a2901d48cf2ea8a8","abstract_canon_sha256":"7e9f65a683e4da320161b1ac26cbb4338f54353a2a965f6f2208152ff07a38cc"},"schema_version":"1.0"},"canonical_sha256":"9b513cab25a22403241ead76564e1a90fff1f79cb03a6c96b94e283adef8be02","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:13:35.626619Z","signature_b64":"Q5EsG1vcfRtpOyqxuSRgIekPwv8K5WEFjXwyKnu5b0usJewO4OdB0299LL7QiocxFP/qao0qSDVNyCukvxSjBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9b513cab25a22403241ead76564e1a90fff1f79cb03a6c96b94e283adef8be02","last_reissued_at":"2026-07-05T01:13:35.626256Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:13:35.626256Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2006.14688","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":"2026-07-05T01:13:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"khyMebRatISsUxxM5knwW+3zX7cpRlXWPef3Fy2a1ztZEgbZ/7NqlLHVNbj+aCKKspN4BFopo/T0RG0U0aVwDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T04:26:16.645529Z"},"content_sha256":"37c4371b0b0eecd8dba6de355a4d0121408887f4a67c04a18779fa61f88713ca","schema_version":"1.0","event_id":"sha256:37c4371b0b0eecd8dba6de355a4d0121408887f4a67c04a18779fa61f88713ca"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:TNITZKZFUISAGJA6VV3FMTQ2SD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An in-depth reanalysis of the alleged type Ia supernova progenitor Henize 2-428","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"M. A. Barstow, M. M. Miller Bertolami, N. L. Finch, N. Reindl, S. Geier, S. L. Casewell, S. Taubenberger, V. Schaffenroth","submitted_at":"2020-06-25T20:35:36Z","abstract_excerpt":"The nucleus of the planetary nebula Hen2-428 is a short orbital-period (4.2h), double-lined spectroscopic binary, whose status as a potential supernova type Ia progenitor has raised some controversy in the literature. With the aim of resolving this debate, we carried out an in-depth reanalysis of the system. Our approach combines a refined wavelength calibration, thorough line-identifications, improved radial-velocity measurements, non-LTE spectral modeling, as well as multi-band light-curve fitting. Our results are then discussed in view of state-of-the-art stellar evolutionary models.\n  Besi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.14688","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2006.14688/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T01:13:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pSbmqB2uQg5GcJDvimYF+QDxJW4M0QIGxmgChJwIlBE5jAj5u53bVr0omwHjE7gQkzP97eCO5R+jOEvYd90TCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T04:26:16.646176Z"},"content_sha256":"255e1d58fe206321901d97bf40437af38198171574c1fe224a7237f328bc12fa","schema_version":"1.0","event_id":"sha256:255e1d58fe206321901d97bf40437af38198171574c1fe224a7237f328bc12fa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TNITZKZFUISAGJA6VV3FMTQ2SD/bundle.json","state_url":"https://pith.science/pith/TNITZKZFUISAGJA6VV3FMTQ2SD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TNITZKZFUISAGJA6VV3FMTQ2SD/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":"2026-08-13T04:26:16Z","links":{"resolver":"https://pith.science/pith/TNITZKZFUISAGJA6VV3FMTQ2SD","bundle":"https://pith.science/pith/TNITZKZFUISAGJA6VV3FMTQ2SD/bundle.json","state":"https://pith.science/pith/TNITZKZFUISAGJA6VV3FMTQ2SD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TNITZKZFUISAGJA6VV3FMTQ2SD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:TNITZKZFUISAGJA6VV3FMTQ2SD","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":"7e9f65a683e4da320161b1ac26cbb4338f54353a2a965f6f2208152ff07a38cc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2020-06-25T20:35:36Z","title_canon_sha256":"c4ff867679c233ee218cff7880d2e131f2051ee629b4d976a2901d48cf2ea8a8"},"schema_version":"1.0","source":{"id":"2006.14688","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2006.14688","created_at":"2026-07-05T01:13:35Z"},{"alias_kind":"arxiv_version","alias_value":"2006.14688v1","created_at":"2026-07-05T01:13:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2006.14688","created_at":"2026-07-05T01:13:35Z"},{"alias_kind":"pith_short_12","alias_value":"TNITZKZFUISA","created_at":"2026-07-05T01:13:35Z"},{"alias_kind":"pith_short_16","alias_value":"TNITZKZFUISAGJA6","created_at":"2026-07-05T01:13:35Z"},{"alias_kind":"pith_short_8","alias_value":"TNITZKZF","created_at":"2026-07-05T01:13:35Z"}],"graph_snapshots":[{"event_id":"sha256:255e1d58fe206321901d97bf40437af38198171574c1fe224a7237f328bc12fa","target":"graph","created_at":"2026-07-05T01:13:35Z","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/2006.14688/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The nucleus of the planetary nebula Hen2-428 is a short orbital-period (4.2h), double-lined spectroscopic binary, whose status as a potential supernova type Ia progenitor has raised some controversy in the literature. With the aim of resolving this debate, we carried out an in-depth reanalysis of the system. Our approach combines a refined wavelength calibration, thorough line-identifications, improved radial-velocity measurements, non-LTE spectral modeling, as well as multi-band light-curve fitting. Our results are then discussed in view of state-of-the-art stellar evolutionary models.\n  Besi","authors_text":"M. A. Barstow, M. M. Miller Bertolami, N. L. Finch, N. Reindl, S. Geier, S. L. Casewell, S. Taubenberger, V. Schaffenroth","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2020-06-25T20:35:36Z","title":"An in-depth reanalysis of the alleged type Ia supernova progenitor Henize 2-428"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.14688","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":"sha256:37c4371b0b0eecd8dba6de355a4d0121408887f4a67c04a18779fa61f88713ca","target":"record","created_at":"2026-07-05T01:13:35Z","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":"7e9f65a683e4da320161b1ac26cbb4338f54353a2a965f6f2208152ff07a38cc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2020-06-25T20:35:36Z","title_canon_sha256":"c4ff867679c233ee218cff7880d2e131f2051ee629b4d976a2901d48cf2ea8a8"},"schema_version":"1.0","source":{"id":"2006.14688","kind":"arxiv","version":1}},"canonical_sha256":"9b513cab25a22403241ead76564e1a90fff1f79cb03a6c96b94e283adef8be02","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9b513cab25a22403241ead76564e1a90fff1f79cb03a6c96b94e283adef8be02","first_computed_at":"2026-07-05T01:13:35.626256Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:13:35.626256Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Q5EsG1vcfRtpOyqxuSRgIekPwv8K5WEFjXwyKnu5b0usJewO4OdB0299LL7QiocxFP/qao0qSDVNyCukvxSjBg==","signature_status":"signed_v1","signed_at":"2026-07-05T01:13:35.626619Z","signed_message":"canonical_sha256_bytes"},"source_id":"2006.14688","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:37c4371b0b0eecd8dba6de355a4d0121408887f4a67c04a18779fa61f88713ca","sha256:255e1d58fe206321901d97bf40437af38198171574c1fe224a7237f328bc12fa"],"state_sha256":"59a5f0a759a14cef9fdc79b2cde8e586610239aa73074f7af8cbf13a115671fa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E0gN6MkiDHLeutSxVDSCzEYzkzk1O8PtHw2dyYcxU0nSjrwn5WYpqyaV5YYXrqJTYzMWtmwbjhENcuQBNYNPAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T04:26:16.650162Z","bundle_sha256":"30f32c955dd8b21fa2c4e4684c4a26f59b1df21527942214543aaf5be72812f0"}}