{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:HJ2M5DX7OCNLGLIKTAEA7NGEWM","short_pith_number":"pith:HJ2M5DX7","canonical_record":{"source":{"id":"1109.6495","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-09-29T11:50:57Z","cross_cats_sorted":[],"title_canon_sha256":"2cfb0086e900dd51d486ac4b70a7e8b020dfa27b9f554c1e96d13a68fcb2a9e4","abstract_canon_sha256":"4060ae29f3bfbf5c12b0e5592aac349ed58ffbbca46345522d744619e3f4ca0d"},"schema_version":"1.0"},"canonical_sha256":"3a74ce8eff709ab32d0a98080fb4c4b303022d47d32695b60827aa216b5d16a4","source":{"kind":"arxiv","id":"1109.6495","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.6495","created_at":"2026-05-18T04:12:01Z"},{"alias_kind":"arxiv_version","alias_value":"1109.6495v1","created_at":"2026-05-18T04:12:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.6495","created_at":"2026-05-18T04:12:01Z"},{"alias_kind":"pith_short_12","alias_value":"HJ2M5DX7OCNL","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_16","alias_value":"HJ2M5DX7OCNLGLIK","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_8","alias_value":"HJ2M5DX7","created_at":"2026-05-18T12:26:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:HJ2M5DX7OCNLGLIKTAEA7NGEWM","target":"record","payload":{"canonical_record":{"source":{"id":"1109.6495","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-09-29T11:50:57Z","cross_cats_sorted":[],"title_canon_sha256":"2cfb0086e900dd51d486ac4b70a7e8b020dfa27b9f554c1e96d13a68fcb2a9e4","abstract_canon_sha256":"4060ae29f3bfbf5c12b0e5592aac349ed58ffbbca46345522d744619e3f4ca0d"},"schema_version":"1.0"},"canonical_sha256":"3a74ce8eff709ab32d0a98080fb4c4b303022d47d32695b60827aa216b5d16a4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:12:01.450015Z","signature_b64":"Z1ROxUBPQN8zjz7SnIeUN4BhCMzia8oTsSW6Rb5mRcHoPv2qg/bqK+PLNQ36HFVoyYPJCNNaSGeoDHgsQdWZBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3a74ce8eff709ab32d0a98080fb4c4b303022d47d32695b60827aa216b5d16a4","last_reissued_at":"2026-05-18T04:12:01.449531Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:12:01.449531Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1109.6495","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":"2026-05-18T04:12:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OcJFF/AMVciKl8aQ0e1qSIm4s3ylRTO3GYxNY7pFFtNFXcieg51WBu27GwS0Z4Gyuhe/txdr6Svuv1wXhGewCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T14:04:21.630739Z"},"content_sha256":"a89669507366cdf3ee8d1e9f2ac2de61eebae06fe467bbdbba8009dc17f338bc","schema_version":"1.0","event_id":"sha256:a89669507366cdf3ee8d1e9f2ac2de61eebae06fe467bbdbba8009dc17f338bc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:HJ2M5DX7OCNLGLIKTAEA7NGEWM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ortho-H2 and the Age of Interstellar Dark Clouds","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Evelyne Roueff (LUTH), Laurent Pagani (LERMA), Pierre Lesaffre (LERMA)","submitted_at":"2011-09-29T11:50:57Z","abstract_excerpt":"Interstellar dark clouds are the sites of star formation. Their main component, dihydrogen, exists under two states, ortho and para. H2 is supposed to form in the ortho:para ratio (OPR) of 3:1 and to subsequently decay to almost pure para-H2 (OPR <= 0.001). Only if the H2 OPR is low enough, will deuteration enrichment, as observed in the cores of these clouds, be efficient. The second condition for strong deuteration enrichment is the local disappearance of CO, which freezes out onto grains in the core formation process. We show that this latter condition does not apply to DCO+, which, therefo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.6495","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":"2026-05-18T04:12:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tG6wMpFXjL8xkZJu58BjPog97rRX5pnPgCaAtHjjlGwmSi4GovmlgH6hGeV5MnVy3lw3TbObLxK0mD+F8NvkAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T14:04:21.631088Z"},"content_sha256":"68782a80cd525a1bbe0f3927ccbf16e0a5841c15963ef052bf98e39059a3aa01","schema_version":"1.0","event_id":"sha256:68782a80cd525a1bbe0f3927ccbf16e0a5841c15963ef052bf98e39059a3aa01"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HJ2M5DX7OCNLGLIKTAEA7NGEWM/bundle.json","state_url":"https://pith.science/pith/HJ2M5DX7OCNLGLIKTAEA7NGEWM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HJ2M5DX7OCNLGLIKTAEA7NGEWM/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":"2026-06-05T14:04:21Z","links":{"resolver":"https://pith.science/pith/HJ2M5DX7OCNLGLIKTAEA7NGEWM","bundle":"https://pith.science/pith/HJ2M5DX7OCNLGLIKTAEA7NGEWM/bundle.json","state":"https://pith.science/pith/HJ2M5DX7OCNLGLIKTAEA7NGEWM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HJ2M5DX7OCNLGLIKTAEA7NGEWM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:HJ2M5DX7OCNLGLIKTAEA7NGEWM","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":"4060ae29f3bfbf5c12b0e5592aac349ed58ffbbca46345522d744619e3f4ca0d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-09-29T11:50:57Z","title_canon_sha256":"2cfb0086e900dd51d486ac4b70a7e8b020dfa27b9f554c1e96d13a68fcb2a9e4"},"schema_version":"1.0","source":{"id":"1109.6495","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.6495","created_at":"2026-05-18T04:12:01Z"},{"alias_kind":"arxiv_version","alias_value":"1109.6495v1","created_at":"2026-05-18T04:12:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.6495","created_at":"2026-05-18T04:12:01Z"},{"alias_kind":"pith_short_12","alias_value":"HJ2M5DX7OCNL","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_16","alias_value":"HJ2M5DX7OCNLGLIK","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_8","alias_value":"HJ2M5DX7","created_at":"2026-05-18T12:26:30Z"}],"graph_snapshots":[{"event_id":"sha256:68782a80cd525a1bbe0f3927ccbf16e0a5841c15963ef052bf98e39059a3aa01","target":"graph","created_at":"2026-05-18T04:12:01Z","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":"Interstellar dark clouds are the sites of star formation. Their main component, dihydrogen, exists under two states, ortho and para. H2 is supposed to form in the ortho:para ratio (OPR) of 3:1 and to subsequently decay to almost pure para-H2 (OPR <= 0.001). Only if the H2 OPR is low enough, will deuteration enrichment, as observed in the cores of these clouds, be efficient. The second condition for strong deuteration enrichment is the local disappearance of CO, which freezes out onto grains in the core formation process. We show that this latter condition does not apply to DCO+, which, therefo","authors_text":"Evelyne Roueff (LUTH), Laurent Pagani (LERMA), Pierre Lesaffre (LERMA)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-09-29T11:50:57Z","title":"Ortho-H2 and the Age of Interstellar Dark Clouds"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.6495","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:a89669507366cdf3ee8d1e9f2ac2de61eebae06fe467bbdbba8009dc17f338bc","target":"record","created_at":"2026-05-18T04:12:01Z","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":"4060ae29f3bfbf5c12b0e5592aac349ed58ffbbca46345522d744619e3f4ca0d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-09-29T11:50:57Z","title_canon_sha256":"2cfb0086e900dd51d486ac4b70a7e8b020dfa27b9f554c1e96d13a68fcb2a9e4"},"schema_version":"1.0","source":{"id":"1109.6495","kind":"arxiv","version":1}},"canonical_sha256":"3a74ce8eff709ab32d0a98080fb4c4b303022d47d32695b60827aa216b5d16a4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3a74ce8eff709ab32d0a98080fb4c4b303022d47d32695b60827aa216b5d16a4","first_computed_at":"2026-05-18T04:12:01.449531Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:12:01.449531Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Z1ROxUBPQN8zjz7SnIeUN4BhCMzia8oTsSW6Rb5mRcHoPv2qg/bqK+PLNQ36HFVoyYPJCNNaSGeoDHgsQdWZBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:12:01.450015Z","signed_message":"canonical_sha256_bytes"},"source_id":"1109.6495","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a89669507366cdf3ee8d1e9f2ac2de61eebae06fe467bbdbba8009dc17f338bc","sha256:68782a80cd525a1bbe0f3927ccbf16e0a5841c15963ef052bf98e39059a3aa01"],"state_sha256":"25b26b5a7c79053bae7dacc842959f4fa7d4ccbcf558eb17c1fcd6963e6c3118"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Gvcy+O5hZGDzVLvL9PQHVvWAu65psSQYmUSYVTpHOs+WlBA0WiFFKZShJni7i3Nz0in62Jd7HCGcoHJCbu27CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T14:04:21.633042Z","bundle_sha256":"285fb6a8ef9496d1713358979ed0a8b0f4c72b2f307eccf46a198dd075ca66de"}}