{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:AUS2BIHOQRHWJN4ZAZ42HBYSEN","short_pith_number":"pith:AUS2BIHO","canonical_record":{"source":{"id":"2008.09780","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-08-22T08:35:06Z","cross_cats_sorted":[],"title_canon_sha256":"f9b1df51769ea7ba24fcdb6dea890c9538d1f04a1f928d51ebfea2d4177d7354","abstract_canon_sha256":"d5ba0ab13ead235161b8a0cb65d2c06e688216c8b08f9010357ee8e258e4d512"},"schema_version":"1.0"},"canonical_sha256":"0525a0a0ee844f64b7990679a387122348f3d39454ea7379dc8bb04a775a5d8a","source":{"kind":"arxiv","id":"2008.09780","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2008.09780","created_at":"2026-07-05T02:29:29Z"},{"alias_kind":"arxiv_version","alias_value":"2008.09780v1","created_at":"2026-07-05T02:29:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.09780","created_at":"2026-07-05T02:29:29Z"},{"alias_kind":"pith_short_12","alias_value":"AUS2BIHOQRHW","created_at":"2026-07-05T02:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"AUS2BIHOQRHWJN4Z","created_at":"2026-07-05T02:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"AUS2BIHO","created_at":"2026-07-05T02:29:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:AUS2BIHOQRHWJN4ZAZ42HBYSEN","target":"record","payload":{"canonical_record":{"source":{"id":"2008.09780","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-08-22T08:35:06Z","cross_cats_sorted":[],"title_canon_sha256":"f9b1df51769ea7ba24fcdb6dea890c9538d1f04a1f928d51ebfea2d4177d7354","abstract_canon_sha256":"d5ba0ab13ead235161b8a0cb65d2c06e688216c8b08f9010357ee8e258e4d512"},"schema_version":"1.0"},"canonical_sha256":"0525a0a0ee844f64b7990679a387122348f3d39454ea7379dc8bb04a775a5d8a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:29:29.998795Z","signature_b64":"skvblWFXHglbyNHFGxZUiPD6t9FIenmz9IXv9K/Ld2bzHeGzS27+nsHQewN4yG4/cFgvB8eJyny7JhFo9Xf0AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0525a0a0ee844f64b7990679a387122348f3d39454ea7379dc8bb04a775a5d8a","last_reissued_at":"2026-07-05T02:29:29.998231Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:29:29.998231Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2008.09780","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":"2026-07-05T02:29:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9LkCZ30xlFbAZJ072UrP96hednlSjShkYSZCb6273BGmU6jit4KWYaymsmYTn/S7GhBdqyB21s/nSMO5xY18BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T14:11:25.843011Z"},"content_sha256":"87ee4ba667940501f40e2bab5075f8786c22e3d0f829c7ef359179ee8fcec845","schema_version":"1.0","event_id":"sha256:87ee4ba667940501f40e2bab5075f8786c22e3d0f829c7ef359179ee8fcec845"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:AUS2BIHOQRHWJN4ZAZ42HBYSEN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultraviolet spectra of extreme nearby star-forming regions: evidence for an overabundance of very massive stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alba Vidal-Garc\\'ia, Daniel P. Stark, Gustavo Bruzual, Jacopo Chevallard, Peter Senchyna, St\\'ephane Charlot","submitted_at":"2020-08-22T08:35:06Z","abstract_excerpt":"As deep spectroscopic campaigns extend to higher redshifts and lower stellar masses, the interpretation of galaxy spectra depends increasingly upon models for very young stellar populations. Here we present new HST/COS ultraviolet spectroscopy of seven nearby ($<120$ Mpc) star-forming regions hosting very young stellar populations ($\\sim$ 4-20 Myr) with optical Wolf-Rayet stellar wind signatures, ideal laboratories in which to test these stellar models. We detect nebular C III] in all seven, but at equivalent widths uniformly $< 10$ {\\AA}. This suggests that even for very young stellar populat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.09780","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2008.09780/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":"2026-07-05T02:29:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qReOqMGAQS8OlyNradT0Wsa2iHYRLdYOwxPIBoZ1dgzCWQmGyEoO8gZJdY9K1wF1eBt6JUU6WQ1B3I8g7pi0Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T14:11:25.843515Z"},"content_sha256":"d5bcd3431c3c0503eec887791a73b5f141a9cd6664be5c2a9bc2285bdcdaf3ae","schema_version":"1.0","event_id":"sha256:d5bcd3431c3c0503eec887791a73b5f141a9cd6664be5c2a9bc2285bdcdaf3ae"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AUS2BIHOQRHWJN4ZAZ42HBYSEN/bundle.json","state_url":"https://pith.science/pith/AUS2BIHOQRHWJN4ZAZ42HBYSEN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AUS2BIHOQRHWJN4ZAZ42HBYSEN/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":"2026-08-06T14:11:25Z","links":{"resolver":"https://pith.science/pith/AUS2BIHOQRHWJN4ZAZ42HBYSEN","bundle":"https://pith.science/pith/AUS2BIHOQRHWJN4ZAZ42HBYSEN/bundle.json","state":"https://pith.science/pith/AUS2BIHOQRHWJN4ZAZ42HBYSEN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AUS2BIHOQRHWJN4ZAZ42HBYSEN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:AUS2BIHOQRHWJN4ZAZ42HBYSEN","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":"d5ba0ab13ead235161b8a0cb65d2c06e688216c8b08f9010357ee8e258e4d512","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-08-22T08:35:06Z","title_canon_sha256":"f9b1df51769ea7ba24fcdb6dea890c9538d1f04a1f928d51ebfea2d4177d7354"},"schema_version":"1.0","source":{"id":"2008.09780","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2008.09780","created_at":"2026-07-05T02:29:29Z"},{"alias_kind":"arxiv_version","alias_value":"2008.09780v1","created_at":"2026-07-05T02:29:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.09780","created_at":"2026-07-05T02:29:29Z"},{"alias_kind":"pith_short_12","alias_value":"AUS2BIHOQRHW","created_at":"2026-07-05T02:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"AUS2BIHOQRHWJN4Z","created_at":"2026-07-05T02:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"AUS2BIHO","created_at":"2026-07-05T02:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:d5bcd3431c3c0503eec887791a73b5f141a9cd6664be5c2a9bc2285bdcdaf3ae","target":"graph","created_at":"2026-07-05T02:29:29Z","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/2008.09780/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"As deep spectroscopic campaigns extend to higher redshifts and lower stellar masses, the interpretation of galaxy spectra depends increasingly upon models for very young stellar populations. Here we present new HST/COS ultraviolet spectroscopy of seven nearby ($<120$ Mpc) star-forming regions hosting very young stellar populations ($\\sim$ 4-20 Myr) with optical Wolf-Rayet stellar wind signatures, ideal laboratories in which to test these stellar models. We detect nebular C III] in all seven, but at equivalent widths uniformly $< 10$ {\\AA}. This suggests that even for very young stellar populat","authors_text":"Alba Vidal-Garc\\'ia, Daniel P. Stark, Gustavo Bruzual, Jacopo Chevallard, Peter Senchyna, St\\'ephane Charlot","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-08-22T08:35:06Z","title":"Ultraviolet spectra of extreme nearby star-forming regions: evidence for an overabundance of very massive stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.09780","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":"sha256:87ee4ba667940501f40e2bab5075f8786c22e3d0f829c7ef359179ee8fcec845","target":"record","created_at":"2026-07-05T02:29:29Z","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":"d5ba0ab13ead235161b8a0cb65d2c06e688216c8b08f9010357ee8e258e4d512","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-08-22T08:35:06Z","title_canon_sha256":"f9b1df51769ea7ba24fcdb6dea890c9538d1f04a1f928d51ebfea2d4177d7354"},"schema_version":"1.0","source":{"id":"2008.09780","kind":"arxiv","version":1}},"canonical_sha256":"0525a0a0ee844f64b7990679a387122348f3d39454ea7379dc8bb04a775a5d8a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0525a0a0ee844f64b7990679a387122348f3d39454ea7379dc8bb04a775a5d8a","first_computed_at":"2026-07-05T02:29:29.998231Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:29:29.998231Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"skvblWFXHglbyNHFGxZUiPD6t9FIenmz9IXv9K/Ld2bzHeGzS27+nsHQewN4yG4/cFgvB8eJyny7JhFo9Xf0AQ==","signature_status":"signed_v1","signed_at":"2026-07-05T02:29:29.998795Z","signed_message":"canonical_sha256_bytes"},"source_id":"2008.09780","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:87ee4ba667940501f40e2bab5075f8786c22e3d0f829c7ef359179ee8fcec845","sha256:d5bcd3431c3c0503eec887791a73b5f141a9cd6664be5c2a9bc2285bdcdaf3ae"],"state_sha256":"1f1b393cd8829434a79eeeb9fc89ba88d06ce1dbd1430a33c25006df50551578"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tUDrbnYoqXykXTpU63c/85/qy4hpSzX8sa0G0pKAb2G1CoAhMmNfbmnMsSN6/Fm9saKCa8GkOcVeQPQJaKkeDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T14:11:25.847031Z","bundle_sha256":"f69329ab81464326f3727eb6d0fd2278a52f8256077e4602c3c39bfc402ff91c"}}