{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:KWV3DISLFS6HYS53O6QEFKGZPN","short_pith_number":"pith:KWV3DISL","canonical_record":{"source":{"id":"1007.1881","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-07-12T12:16:15Z","cross_cats_sorted":[],"title_canon_sha256":"1dce3e52f2599f0bd2c0a7daae65c95922d689392c76496d98295ceaa8cd6c7b","abstract_canon_sha256":"edbf5a647ed64106e102117382c275b012bb7aebdd83e6d6d7f65daa469c5409"},"schema_version":"1.0"},"canonical_sha256":"55abb1a24b2cbc7c4bbb77a042a8d97b641eb10db8b958b7b29a12e84e174bf0","source":{"kind":"arxiv","id":"1007.1881","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1007.1881","created_at":"2026-05-18T02:06:22Z"},{"alias_kind":"arxiv_version","alias_value":"1007.1881v1","created_at":"2026-05-18T02:06:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.1881","created_at":"2026-05-18T02:06:22Z"},{"alias_kind":"pith_short_12","alias_value":"KWV3DISLFS6H","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_16","alias_value":"KWV3DISLFS6HYS53","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_8","alias_value":"KWV3DISL","created_at":"2026-05-18T12:26:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:KWV3DISLFS6HYS53O6QEFKGZPN","target":"record","payload":{"canonical_record":{"source":{"id":"1007.1881","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-07-12T12:16:15Z","cross_cats_sorted":[],"title_canon_sha256":"1dce3e52f2599f0bd2c0a7daae65c95922d689392c76496d98295ceaa8cd6c7b","abstract_canon_sha256":"edbf5a647ed64106e102117382c275b012bb7aebdd83e6d6d7f65daa469c5409"},"schema_version":"1.0"},"canonical_sha256":"55abb1a24b2cbc7c4bbb77a042a8d97b641eb10db8b958b7b29a12e84e174bf0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:06:22.963926Z","signature_b64":"5PrGCPSATiEcymZXZ4rjcuptAGb9keIeOMPIREsXqNw850vbx50N5Ektia/ChsIxYz9un76mK6zeyxEwmhRnAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"55abb1a24b2cbc7c4bbb77a042a8d97b641eb10db8b958b7b29a12e84e174bf0","last_reissued_at":"2026-05-18T02:06:22.963210Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:06:22.963210Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1007.1881","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":"2026-05-18T02:06:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Prkx1WaWHwoJXwYHXou4BSNyrnJ1f/EDxfL9nCbfaYyowxDn1gKI3ITHoUg0+1pSbGO9eEf4OlsUAGJ8a3+wCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T16:07:07.865640Z"},"content_sha256":"ccc563a7ee572cd63673745ed7301f705abc9063c2a30d2453ddfb299ae34414","schema_version":"1.0","event_id":"sha256:ccc563a7ee572cd63673745ed7301f705abc9063c2a30d2453ddfb299ae34414"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:KWV3DISLFS6HYS53O6QEFKGZPN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hydrogen and helium in the late phase of SNe IIb","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"I. Maurer, P. Mazzali, S. Hachinger, S. Taubenberger","submitted_at":"2010-07-12T12:16:15Z","abstract_excerpt":"Supernovae of Type IIb contain large fractions of helium and traces of hydrogen, which can be observed in the early and late spectra. Estimates of the hydrogen and helium mass and distribution are mainly based on early-time spectroscopy and are uncertain since the respective lines are usually observed in absorption. Constraining the mass and distribution of H and He is important to gain insight into the progenitor systems of these SNe.\n  We implement a NLTE treatment of hydrogen and helium in a three-dimensional nebular code. Ionisation, recombination, (non-)thermal electron excitation and H$\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.1881","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":""},"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":"2026-05-18T02:06:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Stv2p1NLM8qkPz5m6K+SUMGGveIufLfsfq+9pDI5RXOigSrAaw3Sqc1+BfsSmZQBVWRXRaiTH+E4CaXAHy6gDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T16:07:07.865990Z"},"content_sha256":"5d77705e6ab6f6c04d0d2f82da13b09d891e59fb922d7db8bd75cc363f7b100e","schema_version":"1.0","event_id":"sha256:5d77705e6ab6f6c04d0d2f82da13b09d891e59fb922d7db8bd75cc363f7b100e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KWV3DISLFS6HYS53O6QEFKGZPN/bundle.json","state_url":"https://pith.science/pith/KWV3DISLFS6HYS53O6QEFKGZPN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KWV3DISLFS6HYS53O6QEFKGZPN/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":"2026-06-04T16:07:07Z","links":{"resolver":"https://pith.science/pith/KWV3DISLFS6HYS53O6QEFKGZPN","bundle":"https://pith.science/pith/KWV3DISLFS6HYS53O6QEFKGZPN/bundle.json","state":"https://pith.science/pith/KWV3DISLFS6HYS53O6QEFKGZPN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KWV3DISLFS6HYS53O6QEFKGZPN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:KWV3DISLFS6HYS53O6QEFKGZPN","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":"edbf5a647ed64106e102117382c275b012bb7aebdd83e6d6d7f65daa469c5409","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-07-12T12:16:15Z","title_canon_sha256":"1dce3e52f2599f0bd2c0a7daae65c95922d689392c76496d98295ceaa8cd6c7b"},"schema_version":"1.0","source":{"id":"1007.1881","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1007.1881","created_at":"2026-05-18T02:06:22Z"},{"alias_kind":"arxiv_version","alias_value":"1007.1881v1","created_at":"2026-05-18T02:06:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.1881","created_at":"2026-05-18T02:06:22Z"},{"alias_kind":"pith_short_12","alias_value":"KWV3DISLFS6H","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_16","alias_value":"KWV3DISLFS6HYS53","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_8","alias_value":"KWV3DISL","created_at":"2026-05-18T12:26:09Z"}],"graph_snapshots":[{"event_id":"sha256:5d77705e6ab6f6c04d0d2f82da13b09d891e59fb922d7db8bd75cc363f7b100e","target":"graph","created_at":"2026-05-18T02:06:22Z","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":"Supernovae of Type IIb contain large fractions of helium and traces of hydrogen, which can be observed in the early and late spectra. Estimates of the hydrogen and helium mass and distribution are mainly based on early-time spectroscopy and are uncertain since the respective lines are usually observed in absorption. Constraining the mass and distribution of H and He is important to gain insight into the progenitor systems of these SNe.\n  We implement a NLTE treatment of hydrogen and helium in a three-dimensional nebular code. Ionisation, recombination, (non-)thermal electron excitation and H$\\","authors_text":"I. Maurer, P. Mazzali, S. Hachinger, S. Taubenberger","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-07-12T12:16:15Z","title":"Hydrogen and helium in the late phase of SNe IIb"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.1881","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:ccc563a7ee572cd63673745ed7301f705abc9063c2a30d2453ddfb299ae34414","target":"record","created_at":"2026-05-18T02:06:22Z","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":"edbf5a647ed64106e102117382c275b012bb7aebdd83e6d6d7f65daa469c5409","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-07-12T12:16:15Z","title_canon_sha256":"1dce3e52f2599f0bd2c0a7daae65c95922d689392c76496d98295ceaa8cd6c7b"},"schema_version":"1.0","source":{"id":"1007.1881","kind":"arxiv","version":1}},"canonical_sha256":"55abb1a24b2cbc7c4bbb77a042a8d97b641eb10db8b958b7b29a12e84e174bf0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"55abb1a24b2cbc7c4bbb77a042a8d97b641eb10db8b958b7b29a12e84e174bf0","first_computed_at":"2026-05-18T02:06:22.963210Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:06:22.963210Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5PrGCPSATiEcymZXZ4rjcuptAGb9keIeOMPIREsXqNw850vbx50N5Ektia/ChsIxYz9un76mK6zeyxEwmhRnAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:06:22.963926Z","signed_message":"canonical_sha256_bytes"},"source_id":"1007.1881","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ccc563a7ee572cd63673745ed7301f705abc9063c2a30d2453ddfb299ae34414","sha256:5d77705e6ab6f6c04d0d2f82da13b09d891e59fb922d7db8bd75cc363f7b100e"],"state_sha256":"17a706525586987e59366a62c60fb433d2ca49e3f8952086a49231cbd668a0bf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kN1a1ytnLHI0p30H1B8Iybv45obDc7V2wCVFk6t0oBXJnibGxQ1N2zD9a79kcdKlvzOHLNkSHJPY16Q0YhctDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T16:07:07.867998Z","bundle_sha256":"d50e776135d7d20709e6bffde0f67ea941baa5f4a4bb7c32b51246fbaeae623f"}}