{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:FC46JU5ID5RVFZK5S5DHXEL5YV","short_pith_number":"pith:FC46JU5I","canonical_record":{"source":{"id":"2403.08911","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-03-13T19:00:54Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"8eac7a6db2d95a38e5cce797c3853cb3fd268401bf3d39e332485f9e17fa7971","abstract_canon_sha256":"c7e49f88b0f46797ecbf110521e0a6b6a0e602ef5a5cb87a9402167fb98fdb1a"},"schema_version":"1.0"},"canonical_sha256":"28b9e4d3a81f6352e55d97467b917dc55bfd29587430e87cd537add7369acbe6","source":{"kind":"arxiv","id":"2403.08911","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2403.08911","created_at":"2026-07-05T07:55:49Z"},{"alias_kind":"arxiv_version","alias_value":"2403.08911v1","created_at":"2026-07-05T07:55:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2403.08911","created_at":"2026-07-05T07:55:49Z"},{"alias_kind":"pith_short_12","alias_value":"FC46JU5ID5RV","created_at":"2026-07-05T07:55:49Z"},{"alias_kind":"pith_short_16","alias_value":"FC46JU5ID5RVFZK5","created_at":"2026-07-05T07:55:49Z"},{"alias_kind":"pith_short_8","alias_value":"FC46JU5I","created_at":"2026-07-05T07:55:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:FC46JU5ID5RVFZK5S5DHXEL5YV","target":"record","payload":{"canonical_record":{"source":{"id":"2403.08911","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-03-13T19:00:54Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"8eac7a6db2d95a38e5cce797c3853cb3fd268401bf3d39e332485f9e17fa7971","abstract_canon_sha256":"c7e49f88b0f46797ecbf110521e0a6b6a0e602ef5a5cb87a9402167fb98fdb1a"},"schema_version":"1.0"},"canonical_sha256":"28b9e4d3a81f6352e55d97467b917dc55bfd29587430e87cd537add7369acbe6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:55:49.062479Z","signature_b64":"pp0tFg9yVPEry6jaMPHHZby4tOFaOSvkg8EPOpmfRc0EqkiPtomCPTxQelL6ZwoVfrrYCbgqGFu3kPEXaEhqDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"28b9e4d3a81f6352e55d97467b917dc55bfd29587430e87cd537add7369acbe6","last_reissued_at":"2026-07-05T07:55:49.062030Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:55:49.062030Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2403.08911","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":"2026-07-05T07:55:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+tHREgLZtIJJFD720TfUJEgW4WiENvnFNzRpxw4I9pKRcHdfAYBf5eHYEz67F4/Yonmey44YaT3ylvyG/BC7Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-19T15:26:01.092372Z"},"content_sha256":"d58da6e2c39a084f26d2fb37adb9541704e74fb962622a2b4f8dfd192c75848c","schema_version":"1.0","event_id":"sha256:d58da6e2c39a084f26d2fb37adb9541704e74fb962622a2b4f8dfd192c75848c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:FC46JU5ID5RVFZK5S5DHXEL5YV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Nebular Nitrogen Line Emission in Stripped-Envelope Supernovae -- a New Progenitor Mass Diagnostic","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"Anders Jerkstrand, Izumi Hachisu, Jesper Sollerman, Ken'ichi Nomoto, Koichi Iwamoto, Stan Barmentloo, Stan Woosley","submitted_at":"2024-03-13T19:00:54Z","abstract_excerpt":"Nitrogen is produced by CNO-cycling in massive stars, and can be ejected in significant amounts in supernova explosions. While in H-rich SNe, its [\\ion{N}{II}] 6548, 6583 emission becomes obscured by strong H$\\alpha$, in explosions of He stars, this nitrogen emission becomes more visible. We here explore the formation of this line, using the \\texttt{SUMO} code to compute spectra for a grid of 1D models with parameterized mixing informed from new 2D simulations. Because the mass fraction of nitrogen in the ejecta decreases with larger He core masses, as more of the He/N zone gets processed by s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2403.08911","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/2403.08911/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":"2026-07-05T07:55:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5SjsJ0Phf3hzRHprAn8pqW12uVHGzqimN1CwW1/vmg1duvFbWB4dmL6aUYlIMnU1vfN0/oHIj9C9nf7rYQ5dBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-19T15:26:01.092753Z"},"content_sha256":"4d2970c4ba21af83a023940c48a9b70dabfeff869c1be5916c7c4b847cbe7c9d","schema_version":"1.0","event_id":"sha256:4d2970c4ba21af83a023940c48a9b70dabfeff869c1be5916c7c4b847cbe7c9d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FC46JU5ID5RVFZK5S5DHXEL5YV/bundle.json","state_url":"https://pith.science/pith/FC46JU5ID5RVFZK5S5DHXEL5YV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FC46JU5ID5RVFZK5S5DHXEL5YV/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":"2026-07-19T15:26:01Z","links":{"resolver":"https://pith.science/pith/FC46JU5ID5RVFZK5S5DHXEL5YV","bundle":"https://pith.science/pith/FC46JU5ID5RVFZK5S5DHXEL5YV/bundle.json","state":"https://pith.science/pith/FC46JU5ID5RVFZK5S5DHXEL5YV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FC46JU5ID5RVFZK5S5DHXEL5YV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:FC46JU5ID5RVFZK5S5DHXEL5YV","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":"c7e49f88b0f46797ecbf110521e0a6b6a0e602ef5a5cb87a9402167fb98fdb1a","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-03-13T19:00:54Z","title_canon_sha256":"8eac7a6db2d95a38e5cce797c3853cb3fd268401bf3d39e332485f9e17fa7971"},"schema_version":"1.0","source":{"id":"2403.08911","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2403.08911","created_at":"2026-07-05T07:55:49Z"},{"alias_kind":"arxiv_version","alias_value":"2403.08911v1","created_at":"2026-07-05T07:55:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2403.08911","created_at":"2026-07-05T07:55:49Z"},{"alias_kind":"pith_short_12","alias_value":"FC46JU5ID5RV","created_at":"2026-07-05T07:55:49Z"},{"alias_kind":"pith_short_16","alias_value":"FC46JU5ID5RVFZK5","created_at":"2026-07-05T07:55:49Z"},{"alias_kind":"pith_short_8","alias_value":"FC46JU5I","created_at":"2026-07-05T07:55:49Z"}],"graph_snapshots":[{"event_id":"sha256:4d2970c4ba21af83a023940c48a9b70dabfeff869c1be5916c7c4b847cbe7c9d","target":"graph","created_at":"2026-07-05T07:55:49Z","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/2403.08911/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Nitrogen is produced by CNO-cycling in massive stars, and can be ejected in significant amounts in supernova explosions. While in H-rich SNe, its [\\ion{N}{II}] 6548, 6583 emission becomes obscured by strong H$\\alpha$, in explosions of He stars, this nitrogen emission becomes more visible. We here explore the formation of this line, using the \\texttt{SUMO} code to compute spectra for a grid of 1D models with parameterized mixing informed from new 2D simulations. Because the mass fraction of nitrogen in the ejecta decreases with larger He core masses, as more of the He/N zone gets processed by s","authors_text":"Anders Jerkstrand, Izumi Hachisu, Jesper Sollerman, Ken'ichi Nomoto, Koichi Iwamoto, Stan Barmentloo, Stan Woosley","cross_cats":["astro-ph.SR"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-03-13T19:00:54Z","title":"Nebular Nitrogen Line Emission in Stripped-Envelope Supernovae -- a New Progenitor Mass Diagnostic"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2403.08911","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:d58da6e2c39a084f26d2fb37adb9541704e74fb962622a2b4f8dfd192c75848c","target":"record","created_at":"2026-07-05T07:55:49Z","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":"c7e49f88b0f46797ecbf110521e0a6b6a0e602ef5a5cb87a9402167fb98fdb1a","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-03-13T19:00:54Z","title_canon_sha256":"8eac7a6db2d95a38e5cce797c3853cb3fd268401bf3d39e332485f9e17fa7971"},"schema_version":"1.0","source":{"id":"2403.08911","kind":"arxiv","version":1}},"canonical_sha256":"28b9e4d3a81f6352e55d97467b917dc55bfd29587430e87cd537add7369acbe6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"28b9e4d3a81f6352e55d97467b917dc55bfd29587430e87cd537add7369acbe6","first_computed_at":"2026-07-05T07:55:49.062030Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:55:49.062030Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"pp0tFg9yVPEry6jaMPHHZby4tOFaOSvkg8EPOpmfRc0EqkiPtomCPTxQelL6ZwoVfrrYCbgqGFu3kPEXaEhqDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T07:55:49.062479Z","signed_message":"canonical_sha256_bytes"},"source_id":"2403.08911","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d58da6e2c39a084f26d2fb37adb9541704e74fb962622a2b4f8dfd192c75848c","sha256:4d2970c4ba21af83a023940c48a9b70dabfeff869c1be5916c7c4b847cbe7c9d"],"state_sha256":"6c1634dbb5710c9021e939e658c6248e5b2acd81ec4603a41d5e5e56ecf082c8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+kfD1DKBE5canZLTDwJOZj3O212BbWWXVMkfNYZPGp8SAy2Ntwf0SAc0M2KgqKisXKBa+aCn22XWNCmQIk0BCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-19T15:26:01.094868Z","bundle_sha256":"112c5288eb9be039e165f3dc7f5ac02a89851f8a95c8b4822e3e19e5203a0cdd"}}