{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:VHGWQXVX74E46VT52VFZBY4IXI","short_pith_number":"pith:VHGWQXVX","canonical_record":{"source":{"id":"1604.04621","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-04-15T19:59:59Z","cross_cats_sorted":[],"title_canon_sha256":"bc2ed5d177a514782002f447f1f3313a5207570c4d01671922f285379a019c29","abstract_canon_sha256":"c69c3d62822a266d03026989709675640a340d77be01209970b5fdf1458de9f5"},"schema_version":"1.0"},"canonical_sha256":"a9cd685eb7ff09cf567dd54b90e388ba3a120cfedaa6d391a2b96c7f4306371d","source":{"kind":"arxiv","id":"1604.04621","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.04621","created_at":"2026-05-18T01:13:47Z"},{"alias_kind":"arxiv_version","alias_value":"1604.04621v3","created_at":"2026-05-18T01:13:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.04621","created_at":"2026-05-18T01:13:47Z"},{"alias_kind":"pith_short_12","alias_value":"VHGWQXVX74E4","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"VHGWQXVX74E46VT5","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"VHGWQXVX","created_at":"2026-05-18T12:30:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:VHGWQXVX74E46VT52VFZBY4IXI","target":"record","payload":{"canonical_record":{"source":{"id":"1604.04621","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-04-15T19:59:59Z","cross_cats_sorted":[],"title_canon_sha256":"bc2ed5d177a514782002f447f1f3313a5207570c4d01671922f285379a019c29","abstract_canon_sha256":"c69c3d62822a266d03026989709675640a340d77be01209970b5fdf1458de9f5"},"schema_version":"1.0"},"canonical_sha256":"a9cd685eb7ff09cf567dd54b90e388ba3a120cfedaa6d391a2b96c7f4306371d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:13:47.833081Z","signature_b64":"nUOo2JmtOjJ+3gBkkPVQ4Qfc0kpJU0ReMqctcKHK4OeKAVA8g2N2mHu51xmjHB1r2dFw1OyoD3m44Jb1xrMkCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a9cd685eb7ff09cf567dd54b90e388ba3a120cfedaa6d391a2b96c7f4306371d","last_reissued_at":"2026-05-18T01:13:47.832351Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:13:47.832351Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1604.04621","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:13:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IebRHwQ+1noTRH1UJKsQ6g8m9O6K/DSTK2DTxvybZ6pk4wdgnG322JKgNHBrbPRennje8UkLFG6ElHFjLcK3Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T08:36:43.064051Z"},"content_sha256":"64b12430c0cd76b3ad2ac2704d5f1db3bb4fae81e142fd096ae67499f062ccb4","schema_version":"1.0","event_id":"sha256:64b12430c0cd76b3ad2ac2704d5f1db3bb4fae81e142fd096ae67499f062ccb4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:VHGWQXVX74E46VT52VFZBY4IXI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Discovery of Three Pulsating, Mixed-atmosphere, Extremely Low-mass White Dwarf Precursors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Gianninas, Brandon Curd, G. Fontaine, Mukremin Kilic, Warren R. Brown","submitted_at":"2016-04-15T19:59:59Z","abstract_excerpt":"We report the discovery of pulsations in three mixed-atmosphere, extremely low-mass white dwarf (ELM WD, M $\\leqslant$ 0.3 M$_{\\odot}$) precursors. Following the recent discoveries of pulsations in both ELM and pre-ELM WDs, we targeted pre-ELM WDs with mixed H/He atmospheres with high-speed photometry. We find significant optical variability in all three observed targets with periods in the range 320--590 s, consistent in timescale with theoretical predictions of $p$-mode pulsations in mixed-atmosphere $\\approx$ 0.18 M$_{\\odot}$ He-core pre-ELM WDs. This represents the first empirical evidence"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.04621","kind":"arxiv","version":3},"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":"2026-05-18T01:13:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4LP83nMuTKr+5sWUhgv8c4xA3cpngwZtQlH1ZgRHhiA9nGiMsPp7jVxBEC+AO7USLzMmNuuc0gZIsFJTDOguAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T08:36:43.064406Z"},"content_sha256":"74a2617cf726875e097d40beee31a6e30b6469d154ecf883cdacaedd25f1d803","schema_version":"1.0","event_id":"sha256:74a2617cf726875e097d40beee31a6e30b6469d154ecf883cdacaedd25f1d803"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VHGWQXVX74E46VT52VFZBY4IXI/bundle.json","state_url":"https://pith.science/pith/VHGWQXVX74E46VT52VFZBY4IXI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VHGWQXVX74E46VT52VFZBY4IXI/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":"2026-06-03T08:36:43Z","links":{"resolver":"https://pith.science/pith/VHGWQXVX74E46VT52VFZBY4IXI","bundle":"https://pith.science/pith/VHGWQXVX74E46VT52VFZBY4IXI/bundle.json","state":"https://pith.science/pith/VHGWQXVX74E46VT52VFZBY4IXI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VHGWQXVX74E46VT52VFZBY4IXI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:VHGWQXVX74E46VT52VFZBY4IXI","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":"c69c3d62822a266d03026989709675640a340d77be01209970b5fdf1458de9f5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-04-15T19:59:59Z","title_canon_sha256":"bc2ed5d177a514782002f447f1f3313a5207570c4d01671922f285379a019c29"},"schema_version":"1.0","source":{"id":"1604.04621","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.04621","created_at":"2026-05-18T01:13:47Z"},{"alias_kind":"arxiv_version","alias_value":"1604.04621v3","created_at":"2026-05-18T01:13:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.04621","created_at":"2026-05-18T01:13:47Z"},{"alias_kind":"pith_short_12","alias_value":"VHGWQXVX74E4","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"VHGWQXVX74E46VT5","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"VHGWQXVX","created_at":"2026-05-18T12:30:48Z"}],"graph_snapshots":[{"event_id":"sha256:74a2617cf726875e097d40beee31a6e30b6469d154ecf883cdacaedd25f1d803","target":"graph","created_at":"2026-05-18T01:13:47Z","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":"We report the discovery of pulsations in three mixed-atmosphere, extremely low-mass white dwarf (ELM WD, M $\\leqslant$ 0.3 M$_{\\odot}$) precursors. Following the recent discoveries of pulsations in both ELM and pre-ELM WDs, we targeted pre-ELM WDs with mixed H/He atmospheres with high-speed photometry. We find significant optical variability in all three observed targets with periods in the range 320--590 s, consistent in timescale with theoretical predictions of $p$-mode pulsations in mixed-atmosphere $\\approx$ 0.18 M$_{\\odot}$ He-core pre-ELM WDs. This represents the first empirical evidence","authors_text":"A. Gianninas, Brandon Curd, G. Fontaine, Mukremin Kilic, Warren R. Brown","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-04-15T19:59:59Z","title":"Discovery of Three Pulsating, Mixed-atmosphere, Extremely Low-mass White Dwarf Precursors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.04621","kind":"arxiv","version":3},"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":"sha256:64b12430c0cd76b3ad2ac2704d5f1db3bb4fae81e142fd096ae67499f062ccb4","target":"record","created_at":"2026-05-18T01:13:47Z","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":"c69c3d62822a266d03026989709675640a340d77be01209970b5fdf1458de9f5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-04-15T19:59:59Z","title_canon_sha256":"bc2ed5d177a514782002f447f1f3313a5207570c4d01671922f285379a019c29"},"schema_version":"1.0","source":{"id":"1604.04621","kind":"arxiv","version":3}},"canonical_sha256":"a9cd685eb7ff09cf567dd54b90e388ba3a120cfedaa6d391a2b96c7f4306371d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a9cd685eb7ff09cf567dd54b90e388ba3a120cfedaa6d391a2b96c7f4306371d","first_computed_at":"2026-05-18T01:13:47.832351Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:13:47.832351Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nUOo2JmtOjJ+3gBkkPVQ4Qfc0kpJU0ReMqctcKHK4OeKAVA8g2N2mHu51xmjHB1r2dFw1OyoD3m44Jb1xrMkCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:13:47.833081Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.04621","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:64b12430c0cd76b3ad2ac2704d5f1db3bb4fae81e142fd096ae67499f062ccb4","sha256:74a2617cf726875e097d40beee31a6e30b6469d154ecf883cdacaedd25f1d803"],"state_sha256":"1c506a91203742eeb3e3e2379ccd9f92631ce74bc5d7af0c0a90863910f7e095"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MOeZTbqbzTJtaZFskj77vUMtGduH+G+rCwSQjdD7YyWK5FWH4PqhBbyZcFEC2CIK7zEl7BUM5ralTegQo2LxAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T08:36:43.066442Z","bundle_sha256":"1036cb4349125f8f454c630cff9b3d41841c67acd4282cf72e3d37a0752b45a0"}}