{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:YT6SDGHXBTDVV4WE4FFENWRWCH","short_pith_number":"pith:YT6SDGHX","canonical_record":{"source":{"id":"1205.7068","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-05-31T18:47:47Z","cross_cats_sorted":[],"title_canon_sha256":"3351deb54676ac25d3797e16df448a693f78ee3681df3771e11b1e5b83ebd56d","abstract_canon_sha256":"d665a115915801e1976b1c26c8beb922b4207fc32a620fd282832a26c2e53340"},"schema_version":"1.0"},"canonical_sha256":"c4fd2198f70cc75af2c4e14a46da3611fb147ebc34961db72ac408c437c63334","source":{"kind":"arxiv","id":"1205.7068","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1205.7068","created_at":"2026-05-18T01:57:09Z"},{"alias_kind":"arxiv_version","alias_value":"1205.7068v1","created_at":"2026-05-18T01:57:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1205.7068","created_at":"2026-05-18T01:57:09Z"},{"alias_kind":"pith_short_12","alias_value":"YT6SDGHXBTDV","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"YT6SDGHXBTDVV4WE","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"YT6SDGHX","created_at":"2026-05-18T12:27:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:YT6SDGHXBTDVV4WE4FFENWRWCH","target":"record","payload":{"canonical_record":{"source":{"id":"1205.7068","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-05-31T18:47:47Z","cross_cats_sorted":[],"title_canon_sha256":"3351deb54676ac25d3797e16df448a693f78ee3681df3771e11b1e5b83ebd56d","abstract_canon_sha256":"d665a115915801e1976b1c26c8beb922b4207fc32a620fd282832a26c2e53340"},"schema_version":"1.0"},"canonical_sha256":"c4fd2198f70cc75af2c4e14a46da3611fb147ebc34961db72ac408c437c63334","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:57:09.193486Z","signature_b64":"xoeNYuTVn4y042U8TfM6aYERXFYMsSsysweCHJuXeQKqgJFVHffkwT3rDNy4+UXS2IHOufC94sutWkV744ZpBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c4fd2198f70cc75af2c4e14a46da3611fb147ebc34961db72ac408c437c63334","last_reissued_at":"2026-05-18T01:57:09.192829Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:57:09.192829Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1205.7068","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":"2026-05-18T01:57:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AqM233aMjYXRpR6SeeNVULY6O63d/h1dxxZU0Iq4VCd/tLNleuz30iD+HcrPD3CMR9QxAvznXOwLNKHnLqdDCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T20:24:28.391508Z"},"content_sha256":"afd085a5bf9bef3205d54ea8c3f83d6a510eb6f0cff4dd39559cf7400098c7c1","schema_version":"1.0","event_id":"sha256:afd085a5bf9bef3205d54ea8c3f83d6a510eb6f0cff4dd39559cf7400098c7c1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:YT6SDGHXBTDVV4WE4FFENWRWCH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Spectral Evolution of Convective Mixing White Dwarfs, the non-DA Gap, and White Dwarf Cosmochronology","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Brad M. S. Hansen, Eugene Y. Chen","submitted_at":"2012-05-31T18:47:47Z","abstract_excerpt":"The spectral distribution of field white dwarfs shows a feature called the \"non-DA gap\". As defined by Bergeron et al., this is a temperature range (5100K--6100K) where relatively few non-DA stars are found, even though such stars are abundant on either side of the gap. It is usually viewed as an indication that a significant fraction of white dwarfs switch their atmospheric compositions back and forth between hydrogen-rich and helium-rich as they cool. In this paper, we present a Monte Carlo model of the Galactic disk white dwarf population, based on the spectral evolution model of Chen and H"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.7068","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":"2026-05-18T01:57:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TFcrS945RhESJumH8BWWD3aPdwtGLdBECP6KheYqZuEz/OQ1QnwdmvfdVawOJgRJlGgNIDIw3MXjrg5LHH+4Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T20:24:28.392131Z"},"content_sha256":"864e17fec6b1535f6f4e503cc377f759f98d3872870345269daf6e24f57f7acb","schema_version":"1.0","event_id":"sha256:864e17fec6b1535f6f4e503cc377f759f98d3872870345269daf6e24f57f7acb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YT6SDGHXBTDVV4WE4FFENWRWCH/bundle.json","state_url":"https://pith.science/pith/YT6SDGHXBTDVV4WE4FFENWRWCH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YT6SDGHXBTDVV4WE4FFENWRWCH/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":"2026-05-26T20:24:28Z","links":{"resolver":"https://pith.science/pith/YT6SDGHXBTDVV4WE4FFENWRWCH","bundle":"https://pith.science/pith/YT6SDGHXBTDVV4WE4FFENWRWCH/bundle.json","state":"https://pith.science/pith/YT6SDGHXBTDVV4WE4FFENWRWCH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YT6SDGHXBTDVV4WE4FFENWRWCH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:YT6SDGHXBTDVV4WE4FFENWRWCH","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":"d665a115915801e1976b1c26c8beb922b4207fc32a620fd282832a26c2e53340","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-05-31T18:47:47Z","title_canon_sha256":"3351deb54676ac25d3797e16df448a693f78ee3681df3771e11b1e5b83ebd56d"},"schema_version":"1.0","source":{"id":"1205.7068","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1205.7068","created_at":"2026-05-18T01:57:09Z"},{"alias_kind":"arxiv_version","alias_value":"1205.7068v1","created_at":"2026-05-18T01:57:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1205.7068","created_at":"2026-05-18T01:57:09Z"},{"alias_kind":"pith_short_12","alias_value":"YT6SDGHXBTDV","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"YT6SDGHXBTDVV4WE","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"YT6SDGHX","created_at":"2026-05-18T12:27:30Z"}],"graph_snapshots":[{"event_id":"sha256:864e17fec6b1535f6f4e503cc377f759f98d3872870345269daf6e24f57f7acb","target":"graph","created_at":"2026-05-18T01:57:09Z","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":"The spectral distribution of field white dwarfs shows a feature called the \"non-DA gap\". As defined by Bergeron et al., this is a temperature range (5100K--6100K) where relatively few non-DA stars are found, even though such stars are abundant on either side of the gap. It is usually viewed as an indication that a significant fraction of white dwarfs switch their atmospheric compositions back and forth between hydrogen-rich and helium-rich as they cool. In this paper, we present a Monte Carlo model of the Galactic disk white dwarf population, based on the spectral evolution model of Chen and H","authors_text":"Brad M. S. Hansen, Eugene Y. Chen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-05-31T18:47:47Z","title":"The Spectral Evolution of Convective Mixing White Dwarfs, the non-DA Gap, and White Dwarf Cosmochronology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.7068","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:afd085a5bf9bef3205d54ea8c3f83d6a510eb6f0cff4dd39559cf7400098c7c1","target":"record","created_at":"2026-05-18T01:57:09Z","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":"d665a115915801e1976b1c26c8beb922b4207fc32a620fd282832a26c2e53340","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-05-31T18:47:47Z","title_canon_sha256":"3351deb54676ac25d3797e16df448a693f78ee3681df3771e11b1e5b83ebd56d"},"schema_version":"1.0","source":{"id":"1205.7068","kind":"arxiv","version":1}},"canonical_sha256":"c4fd2198f70cc75af2c4e14a46da3611fb147ebc34961db72ac408c437c63334","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c4fd2198f70cc75af2c4e14a46da3611fb147ebc34961db72ac408c437c63334","first_computed_at":"2026-05-18T01:57:09.192829Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:57:09.192829Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xoeNYuTVn4y042U8TfM6aYERXFYMsSsysweCHJuXeQKqgJFVHffkwT3rDNy4+UXS2IHOufC94sutWkV744ZpBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:57:09.193486Z","signed_message":"canonical_sha256_bytes"},"source_id":"1205.7068","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:afd085a5bf9bef3205d54ea8c3f83d6a510eb6f0cff4dd39559cf7400098c7c1","sha256:864e17fec6b1535f6f4e503cc377f759f98d3872870345269daf6e24f57f7acb"],"state_sha256":"f5724f87dbecdbee1898741f9aa01e563d22abc82588329293f4733c3c4aef1a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"x/qUmV6vxZL8uoHgw8lfBXO7ru0snnit1F78A1QwY2FRv+p7/8uhz8IIt4PmO0n3RnorwHJF1x54VujGG3tUCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T20:24:28.395973Z","bundle_sha256":"a6d8de0db5c2e41cdfcecc5e64d399374b99ee3d633b6a5ed59f920e046440ba"}}