{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:J2FZYRYFNITLA75JSJEES5U3J6","short_pith_number":"pith:J2FZYRYF","canonical_record":{"source":{"id":"1612.04903","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-12-15T01:53:50Z","cross_cats_sorted":[],"title_canon_sha256":"3ceb2c86e6f5af22018c0e90d7c8d7d978a9fc9fc532fc710d7cb07f813a8c02","abstract_canon_sha256":"26ef29137ef8663f981a5e683e9662f19a911ccf9d93bbdba5d1c8e9f84cddba"},"schema_version":"1.0"},"canonical_sha256":"4e8b9c47056a26b07fa9924849769b4f832e077d2ef3901934aa2c0e686da125","source":{"kind":"arxiv","id":"1612.04903","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.04903","created_at":"2026-05-18T00:54:57Z"},{"alias_kind":"arxiv_version","alias_value":"1612.04903v1","created_at":"2026-05-18T00:54:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.04903","created_at":"2026-05-18T00:54:57Z"},{"alias_kind":"pith_short_12","alias_value":"J2FZYRYFNITL","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"J2FZYRYFNITLA75J","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"J2FZYRYF","created_at":"2026-05-18T12:30:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:J2FZYRYFNITLA75JSJEES5U3J6","target":"record","payload":{"canonical_record":{"source":{"id":"1612.04903","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-12-15T01:53:50Z","cross_cats_sorted":[],"title_canon_sha256":"3ceb2c86e6f5af22018c0e90d7c8d7d978a9fc9fc532fc710d7cb07f813a8c02","abstract_canon_sha256":"26ef29137ef8663f981a5e683e9662f19a911ccf9d93bbdba5d1c8e9f84cddba"},"schema_version":"1.0"},"canonical_sha256":"4e8b9c47056a26b07fa9924849769b4f832e077d2ef3901934aa2c0e686da125","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:54:57.399975Z","signature_b64":"6EdwrkT3MC6jG2UBedm0a9nbnqM92/9s2HYe9WFViKch3adxMj7UI2AbjnkscUmNmpMg/dflSTBL3tOYv0vxAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4e8b9c47056a26b07fa9924849769b4f832e077d2ef3901934aa2c0e686da125","last_reissued_at":"2026-05-18T00:54:57.399292Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:54:57.399292Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1612.04903","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":"2026-05-18T00:54:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rujEirA6tf90m4HFLEdushNgH0YLBXCPlbpgxgC51VE99HFlHjxnrSaDPqkq4Yz94wIn9MiX7wmknaYrKeBDCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T19:39:10.416842Z"},"content_sha256":"2f29f135703756715dfae9cb9205f102d7f75f737f42a6f64a652121a835a9df","schema_version":"1.0","event_id":"sha256:2f29f135703756715dfae9cb9205f102d7f75f737f42a6f64a652121a835a9df"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:J2FZYRYFNITLA75JSJEES5U3J6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The CoRoT target HD49933: a possible seismic signature of heavy elements ionization in the deep convective zone","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Ana Brito, Il\\'idio Lopes","submitted_at":"2016-12-15T01:53:50Z","abstract_excerpt":"We use a seismic diagnostic, based on the derivative of the phase shift of the reflected by the surface acoustic waves, to probe the outer layers of the star HD 49933. This diagnostic is particularly sensitive to partial ionization processes occurring above the base of the convective zone. The regions of partial ionization of light elements, hydrogen and helium, have well known seismological signatures. In this work we detect a different seismic signature in the acoustic frequencies, that we showed to correspond to the location where the partial ionization of heavy elements occurs. The locatio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.04903","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":"2026-05-18T00:54:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C1DpBI7Lmj2g+bbBMia9Bh4viSFIjGTy2hnnq11oipCg3EXUtsmKoCnzfEIkozC+PJ/h1h5ggCe2H7JpuD2pCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T19:39:10.417184Z"},"content_sha256":"d611841d0e0c566738c6000bad12a0573a830a617d61dac3d5bdebe472ce3fbb","schema_version":"1.0","event_id":"sha256:d611841d0e0c566738c6000bad12a0573a830a617d61dac3d5bdebe472ce3fbb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/J2FZYRYFNITLA75JSJEES5U3J6/bundle.json","state_url":"https://pith.science/pith/J2FZYRYFNITLA75JSJEES5U3J6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/J2FZYRYFNITLA75JSJEES5U3J6/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":"2026-06-01T19:39:10Z","links":{"resolver":"https://pith.science/pith/J2FZYRYFNITLA75JSJEES5U3J6","bundle":"https://pith.science/pith/J2FZYRYFNITLA75JSJEES5U3J6/bundle.json","state":"https://pith.science/pith/J2FZYRYFNITLA75JSJEES5U3J6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/J2FZYRYFNITLA75JSJEES5U3J6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:J2FZYRYFNITLA75JSJEES5U3J6","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":"26ef29137ef8663f981a5e683e9662f19a911ccf9d93bbdba5d1c8e9f84cddba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-12-15T01:53:50Z","title_canon_sha256":"3ceb2c86e6f5af22018c0e90d7c8d7d978a9fc9fc532fc710d7cb07f813a8c02"},"schema_version":"1.0","source":{"id":"1612.04903","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.04903","created_at":"2026-05-18T00:54:57Z"},{"alias_kind":"arxiv_version","alias_value":"1612.04903v1","created_at":"2026-05-18T00:54:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.04903","created_at":"2026-05-18T00:54:57Z"},{"alias_kind":"pith_short_12","alias_value":"J2FZYRYFNITL","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"J2FZYRYFNITLA75J","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"J2FZYRYF","created_at":"2026-05-18T12:30:22Z"}],"graph_snapshots":[{"event_id":"sha256:d611841d0e0c566738c6000bad12a0573a830a617d61dac3d5bdebe472ce3fbb","target":"graph","created_at":"2026-05-18T00:54:57Z","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 use a seismic diagnostic, based on the derivative of the phase shift of the reflected by the surface acoustic waves, to probe the outer layers of the star HD 49933. This diagnostic is particularly sensitive to partial ionization processes occurring above the base of the convective zone. The regions of partial ionization of light elements, hydrogen and helium, have well known seismological signatures. In this work we detect a different seismic signature in the acoustic frequencies, that we showed to correspond to the location where the partial ionization of heavy elements occurs. The locatio","authors_text":"Ana Brito, Il\\'idio Lopes","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-12-15T01:53:50Z","title":"The CoRoT target HD49933: a possible seismic signature of heavy elements ionization in the deep convective zone"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.04903","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":"sha256:2f29f135703756715dfae9cb9205f102d7f75f737f42a6f64a652121a835a9df","target":"record","created_at":"2026-05-18T00:54:57Z","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":"26ef29137ef8663f981a5e683e9662f19a911ccf9d93bbdba5d1c8e9f84cddba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-12-15T01:53:50Z","title_canon_sha256":"3ceb2c86e6f5af22018c0e90d7c8d7d978a9fc9fc532fc710d7cb07f813a8c02"},"schema_version":"1.0","source":{"id":"1612.04903","kind":"arxiv","version":1}},"canonical_sha256":"4e8b9c47056a26b07fa9924849769b4f832e077d2ef3901934aa2c0e686da125","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4e8b9c47056a26b07fa9924849769b4f832e077d2ef3901934aa2c0e686da125","first_computed_at":"2026-05-18T00:54:57.399292Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:54:57.399292Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6EdwrkT3MC6jG2UBedm0a9nbnqM92/9s2HYe9WFViKch3adxMj7UI2AbjnkscUmNmpMg/dflSTBL3tOYv0vxAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:54:57.399975Z","signed_message":"canonical_sha256_bytes"},"source_id":"1612.04903","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2f29f135703756715dfae9cb9205f102d7f75f737f42a6f64a652121a835a9df","sha256:d611841d0e0c566738c6000bad12a0573a830a617d61dac3d5bdebe472ce3fbb"],"state_sha256":"a962932ffb44e8ae1279509201cf3db947fd8e6186b9e581a46f9c773f11beef"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Fn9dDGqQz4p6+h2b8xXuHmMSpVWJe/xrUx+jEzMNprl0DhTW8iOKh0Egs4d/dYt40DmQ0SYy82y4VnOh67y9Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T19:39:10.419379Z","bundle_sha256":"527b06de90da5fe9d188e06244e9bbb2b5862157561029ff13da259a276bdf94"}}