{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:VRFOUFLT3VSYKU5DFS5LTD33TL","short_pith_number":"pith:VRFOUFLT","canonical_record":{"source":{"id":"1605.06152","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-19T21:39:10Z","cross_cats_sorted":[],"title_canon_sha256":"1ec8def873a42d6c3fb64cc0a7e55b32ad9bcecbaeb90052750b1a3743386d41","abstract_canon_sha256":"d07ff9a49898d944a7492d78075969fc70a9a53de5d68a8899c0f322d204a608"},"schema_version":"1.0"},"canonical_sha256":"ac4aea1573dd658553a32cbab98f7b9acae9db62785b2be95fe484b8ca1d347b","source":{"kind":"arxiv","id":"1605.06152","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.06152","created_at":"2026-05-18T01:08:09Z"},{"alias_kind":"arxiv_version","alias_value":"1605.06152v1","created_at":"2026-05-18T01:08:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.06152","created_at":"2026-05-18T01:08:09Z"},{"alias_kind":"pith_short_12","alias_value":"VRFOUFLT3VSY","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"VRFOUFLT3VSYKU5D","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"VRFOUFLT","created_at":"2026-05-18T12:30:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:VRFOUFLT3VSYKU5DFS5LTD33TL","target":"record","payload":{"canonical_record":{"source":{"id":"1605.06152","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-19T21:39:10Z","cross_cats_sorted":[],"title_canon_sha256":"1ec8def873a42d6c3fb64cc0a7e55b32ad9bcecbaeb90052750b1a3743386d41","abstract_canon_sha256":"d07ff9a49898d944a7492d78075969fc70a9a53de5d68a8899c0f322d204a608"},"schema_version":"1.0"},"canonical_sha256":"ac4aea1573dd658553a32cbab98f7b9acae9db62785b2be95fe484b8ca1d347b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:08:09.320973Z","signature_b64":"XZRxffeYju+5whl5OJmQft4y+sSL8lq+PN2JV4q1qSm4P56KN/0Ow9xTjX/cfS0sgV/yjmnCbNWqOeoduz5ACQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ac4aea1573dd658553a32cbab98f7b9acae9db62785b2be95fe484b8ca1d347b","last_reissued_at":"2026-05-18T01:08:09.320344Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:08:09.320344Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1605.06152","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":"2026-05-18T01:08:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pmqb6WKG3xvjF85oM40RWQLUIu2dKYZlSRfRQaXw6Nlk5vVFTQUk+Wrow/cy9E5ebA5G7hzJXLg77dPu5MIrAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T09:06:23.743743Z"},"content_sha256":"efbe418cf6beed877c13d71f973adce38347397d0a9d847b6e8c8ee60a98b7fd","schema_version":"1.0","event_id":"sha256:efbe418cf6beed877c13d71f973adce38347397d0a9d847b6e8c8ee60a98b7fd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:VRFOUFLT3VSYKU5DFS5LTD33TL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Carbon and Oxygen Abundances in Low Metallicity Dwarf Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Danielle A. Berg, Dawn K. Erb, Evan D. Skillman, Leticia Carigi, Richard B.C. Henry","submitted_at":"2016-05-19T21:39:10Z","abstract_excerpt":"The study of carbon and oxygen abundances yields information on the time evolution and nucleosynthetic origins of these elements, yet remains relatively unexplored. At low metallicities (12+log(O/H) < 8.0), nebular carbon measurements are limited to rest-frame UV collisionally excited emission lines. Therefore, we present UV spectrophotometry of 12 nearby, low-metallicity, high-ionization HII regions in dwarf galaxies obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope. We present the first analysis of the C/O ratio in local galaxies based solely on simultaneous signifi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.06152","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":"2026-05-18T01:08:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dBRWZs62aVvuCMpMDsbOUwrJUGTZDE/+xqFTrPFSAam8CItdhTZWs4ECsEppWnSpqwzPth4cM95VOLaUIdaCBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T09:06:23.744405Z"},"content_sha256":"f932065bab78a7a1bcc03ab67f9eabdeef796634843a1c6e54ce6861f196dbb0","schema_version":"1.0","event_id":"sha256:f932065bab78a7a1bcc03ab67f9eabdeef796634843a1c6e54ce6861f196dbb0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VRFOUFLT3VSYKU5DFS5LTD33TL/bundle.json","state_url":"https://pith.science/pith/VRFOUFLT3VSYKU5DFS5LTD33TL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VRFOUFLT3VSYKU5DFS5LTD33TL/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":"2026-05-27T09:06:23Z","links":{"resolver":"https://pith.science/pith/VRFOUFLT3VSYKU5DFS5LTD33TL","bundle":"https://pith.science/pith/VRFOUFLT3VSYKU5DFS5LTD33TL/bundle.json","state":"https://pith.science/pith/VRFOUFLT3VSYKU5DFS5LTD33TL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VRFOUFLT3VSYKU5DFS5LTD33TL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:VRFOUFLT3VSYKU5DFS5LTD33TL","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":"d07ff9a49898d944a7492d78075969fc70a9a53de5d68a8899c0f322d204a608","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-19T21:39:10Z","title_canon_sha256":"1ec8def873a42d6c3fb64cc0a7e55b32ad9bcecbaeb90052750b1a3743386d41"},"schema_version":"1.0","source":{"id":"1605.06152","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.06152","created_at":"2026-05-18T01:08:09Z"},{"alias_kind":"arxiv_version","alias_value":"1605.06152v1","created_at":"2026-05-18T01:08:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.06152","created_at":"2026-05-18T01:08:09Z"},{"alias_kind":"pith_short_12","alias_value":"VRFOUFLT3VSY","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"VRFOUFLT3VSYKU5D","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"VRFOUFLT","created_at":"2026-05-18T12:30:48Z"}],"graph_snapshots":[{"event_id":"sha256:f932065bab78a7a1bcc03ab67f9eabdeef796634843a1c6e54ce6861f196dbb0","target":"graph","created_at":"2026-05-18T01:08:09Z","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 study of carbon and oxygen abundances yields information on the time evolution and nucleosynthetic origins of these elements, yet remains relatively unexplored. At low metallicities (12+log(O/H) < 8.0), nebular carbon measurements are limited to rest-frame UV collisionally excited emission lines. Therefore, we present UV spectrophotometry of 12 nearby, low-metallicity, high-ionization HII regions in dwarf galaxies obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope. We present the first analysis of the C/O ratio in local galaxies based solely on simultaneous signifi","authors_text":"Danielle A. Berg, Dawn K. Erb, Evan D. Skillman, Leticia Carigi, Richard B.C. Henry","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-19T21:39:10Z","title":"Carbon and Oxygen Abundances in Low Metallicity Dwarf Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.06152","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:efbe418cf6beed877c13d71f973adce38347397d0a9d847b6e8c8ee60a98b7fd","target":"record","created_at":"2026-05-18T01:08:09Z","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":"d07ff9a49898d944a7492d78075969fc70a9a53de5d68a8899c0f322d204a608","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-19T21:39:10Z","title_canon_sha256":"1ec8def873a42d6c3fb64cc0a7e55b32ad9bcecbaeb90052750b1a3743386d41"},"schema_version":"1.0","source":{"id":"1605.06152","kind":"arxiv","version":1}},"canonical_sha256":"ac4aea1573dd658553a32cbab98f7b9acae9db62785b2be95fe484b8ca1d347b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ac4aea1573dd658553a32cbab98f7b9acae9db62785b2be95fe484b8ca1d347b","first_computed_at":"2026-05-18T01:08:09.320344Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:08:09.320344Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XZRxffeYju+5whl5OJmQft4y+sSL8lq+PN2JV4q1qSm4P56KN/0Ow9xTjX/cfS0sgV/yjmnCbNWqOeoduz5ACQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:08:09.320973Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.06152","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:efbe418cf6beed877c13d71f973adce38347397d0a9d847b6e8c8ee60a98b7fd","sha256:f932065bab78a7a1bcc03ab67f9eabdeef796634843a1c6e54ce6861f196dbb0"],"state_sha256":"0fc0fb0eee3e2f9a260b801dc755ea4c2c79d88c8a5da74a62ecb15e7c8717a4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0/rS2ObbcBNOezFBHTS6ddJaJ5L2bxcMr2AgQfY5i9j1l53a9XVvnrm/V8fA60h5Yd7vxy86sQWidHZPRLtqDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T09:06:23.748105Z","bundle_sha256":"82a406800f35517e1f58912b8453fef70426fbbfe9f80cfb2416b4210b60fee9"}}