{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:LI4B5RTFQVNKN43QD4QOS7B6C2","short_pith_number":"pith:LI4B5RTF","canonical_record":{"source":{"id":"2505.13313","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-05-19T16:28:50Z","cross_cats_sorted":[],"title_canon_sha256":"334c5810561b5db9c6b14ed95db99c35e2fdc3e4e051280193e11db4f4dca1e3","abstract_canon_sha256":"b01c40a9c5b0f757f89311c51e34723054c7ca93586350cc133eb655126d2a5f"},"schema_version":"1.0"},"canonical_sha256":"5a381ec665855aa6f3701f20e97c3e16bb96e3abe36d5a03a5b9b8c8830aa008","source":{"kind":"arxiv","id":"2505.13313","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.13313","created_at":"2026-07-05T11:46:43Z"},{"alias_kind":"arxiv_version","alias_value":"2505.13313v2","created_at":"2026-07-05T11:46:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.13313","created_at":"2026-07-05T11:46:43Z"},{"alias_kind":"pith_short_12","alias_value":"LI4B5RTFQVNK","created_at":"2026-07-05T11:46:43Z"},{"alias_kind":"pith_short_16","alias_value":"LI4B5RTFQVNKN43Q","created_at":"2026-07-05T11:46:43Z"},{"alias_kind":"pith_short_8","alias_value":"LI4B5RTF","created_at":"2026-07-05T11:46:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:LI4B5RTFQVNKN43QD4QOS7B6C2","target":"record","payload":{"canonical_record":{"source":{"id":"2505.13313","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-05-19T16:28:50Z","cross_cats_sorted":[],"title_canon_sha256":"334c5810561b5db9c6b14ed95db99c35e2fdc3e4e051280193e11db4f4dca1e3","abstract_canon_sha256":"b01c40a9c5b0f757f89311c51e34723054c7ca93586350cc133eb655126d2a5f"},"schema_version":"1.0"},"canonical_sha256":"5a381ec665855aa6f3701f20e97c3e16bb96e3abe36d5a03a5b9b8c8830aa008","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:46:43.292540Z","signature_b64":"tk+eZt1x0zr3NO4KuPmFitqdSXoS2vTv+vdlBd554WoqOeKxjgajsQIPGovbrHtU5C6c6D8DfUt34j37iSkNCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5a381ec665855aa6f3701f20e97c3e16bb96e3abe36d5a03a5b9b8c8830aa008","last_reissued_at":"2026-07-05T11:46:43.291981Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:46:43.291981Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2505.13313","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:46:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SjH9ahgb0r4X0J2z954dR/wf/l10pYJNFO5UEzv87rIW0geI+pTFakBqeiEeMP732L8t8JNGM6FEjLRK8b0zCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T11:55:33.996215Z"},"content_sha256":"5760b3e7608ba5f169fdbc61432aed0328b7a4880240980005e897e04c55ac9c","schema_version":"1.0","event_id":"sha256:5760b3e7608ba5f169fdbc61432aed0328b7a4880240980005e897e04c55ac9c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:LI4B5RTFQVNKN43QD4QOS7B6C2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Early Post Asymptotic Giant Branch Instability: Does it Affect White Dwarf Hydrogen Envelope Mass?","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"James MacDonald","submitted_at":"2025-05-19T16:28:50Z","abstract_excerpt":"Although most white dwarf stars have hydrogen-dominated atmospheres, a significant fraction have atmospheres in which hydrogen is spectroscopically absent, with the fraction of hydrogen-free atmospheres varying with effective temperature. Estimates of the total mass of hydrogen, MH, in the stellar envelope from either asteroseismology or spectral evolution are at odds with predicted values from theoretical stellar evolution modeling. Recent work has found that models in the early post Asymptotic Giant Branch (AGB) phase of evolution can exhibit thermally and dynamical unstable behavior. Here w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.13313","kind":"arxiv","version":2},"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/2505.13313/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":"2026-07-05T11:46:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XxpiMeV8NdkxiksHOUmW+wUWTQxd1i0zjLl37Y5TqCW9Dsx12UHSSON+g1jE1QAk+3pIdG2V7IsZMj0mNoh6Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T11:55:33.997090Z"},"content_sha256":"a6099400cb5653a1d112e72fd5a069ed6e8e650636839e54be337dae682e8dab","schema_version":"1.0","event_id":"sha256:a6099400cb5653a1d112e72fd5a069ed6e8e650636839e54be337dae682e8dab"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LI4B5RTFQVNKN43QD4QOS7B6C2/bundle.json","state_url":"https://pith.science/pith/LI4B5RTFQVNKN43QD4QOS7B6C2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LI4B5RTFQVNKN43QD4QOS7B6C2/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":"2026-08-18T11:55:34Z","links":{"resolver":"https://pith.science/pith/LI4B5RTFQVNKN43QD4QOS7B6C2","bundle":"https://pith.science/pith/LI4B5RTFQVNKN43QD4QOS7B6C2/bundle.json","state":"https://pith.science/pith/LI4B5RTFQVNKN43QD4QOS7B6C2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LI4B5RTFQVNKN43QD4QOS7B6C2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:LI4B5RTFQVNKN43QD4QOS7B6C2","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":"b01c40a9c5b0f757f89311c51e34723054c7ca93586350cc133eb655126d2a5f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-05-19T16:28:50Z","title_canon_sha256":"334c5810561b5db9c6b14ed95db99c35e2fdc3e4e051280193e11db4f4dca1e3"},"schema_version":"1.0","source":{"id":"2505.13313","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2505.13313","created_at":"2026-07-05T11:46:43Z"},{"alias_kind":"arxiv_version","alias_value":"2505.13313v2","created_at":"2026-07-05T11:46:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2505.13313","created_at":"2026-07-05T11:46:43Z"},{"alias_kind":"pith_short_12","alias_value":"LI4B5RTFQVNK","created_at":"2026-07-05T11:46:43Z"},{"alias_kind":"pith_short_16","alias_value":"LI4B5RTFQVNKN43Q","created_at":"2026-07-05T11:46:43Z"},{"alias_kind":"pith_short_8","alias_value":"LI4B5RTF","created_at":"2026-07-05T11:46:43Z"}],"graph_snapshots":[{"event_id":"sha256:a6099400cb5653a1d112e72fd5a069ed6e8e650636839e54be337dae682e8dab","target":"graph","created_at":"2026-07-05T11:46:43Z","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/2505.13313/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Although most white dwarf stars have hydrogen-dominated atmospheres, a significant fraction have atmospheres in which hydrogen is spectroscopically absent, with the fraction of hydrogen-free atmospheres varying with effective temperature. Estimates of the total mass of hydrogen, MH, in the stellar envelope from either asteroseismology or spectral evolution are at odds with predicted values from theoretical stellar evolution modeling. Recent work has found that models in the early post Asymptotic Giant Branch (AGB) phase of evolution can exhibit thermally and dynamical unstable behavior. Here w","authors_text":"James MacDonald","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-05-19T16:28:50Z","title":"Early Post Asymptotic Giant Branch Instability: Does it Affect White Dwarf Hydrogen Envelope Mass?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.13313","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":"sha256:5760b3e7608ba5f169fdbc61432aed0328b7a4880240980005e897e04c55ac9c","target":"record","created_at":"2026-07-05T11:46:43Z","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":"b01c40a9c5b0f757f89311c51e34723054c7ca93586350cc133eb655126d2a5f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-05-19T16:28:50Z","title_canon_sha256":"334c5810561b5db9c6b14ed95db99c35e2fdc3e4e051280193e11db4f4dca1e3"},"schema_version":"1.0","source":{"id":"2505.13313","kind":"arxiv","version":2}},"canonical_sha256":"5a381ec665855aa6f3701f20e97c3e16bb96e3abe36d5a03a5b9b8c8830aa008","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5a381ec665855aa6f3701f20e97c3e16bb96e3abe36d5a03a5b9b8c8830aa008","first_computed_at":"2026-07-05T11:46:43.291981Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:46:43.291981Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tk+eZt1x0zr3NO4KuPmFitqdSXoS2vTv+vdlBd554WoqOeKxjgajsQIPGovbrHtU5C6c6D8DfUt34j37iSkNCg==","signature_status":"signed_v1","signed_at":"2026-07-05T11:46:43.292540Z","signed_message":"canonical_sha256_bytes"},"source_id":"2505.13313","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5760b3e7608ba5f169fdbc61432aed0328b7a4880240980005e897e04c55ac9c","sha256:a6099400cb5653a1d112e72fd5a069ed6e8e650636839e54be337dae682e8dab"],"state_sha256":"a9d8b060fbcbc2d249fd0b91251634129b36054e78f23497da28c7bb8e6a5b9d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yyw9mK03P9T1GvXPezCYHBRpeG58eItHDw4pA/2H51K/LWs1erfs4F3jfrVwyEbkDxWesL+4fQVMkyIqCD6vDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T11:55:34.004174Z","bundle_sha256":"32c8ede6238e1579ac242b3ea1d38acd5934e3ad01067c65a6613e0a7294df22"}}