{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:AHKAFVMN67WOQISDZPC6NM7LYV","short_pith_number":"pith:AHKAFVMN","canonical_record":{"source":{"id":"1108.0604","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-08-02T16:03:03Z","cross_cats_sorted":[],"title_canon_sha256":"dbac6499cbd5c34b6040922a894da26629b6e715662b644e11f4b4b3efd41438","abstract_canon_sha256":"2e7e962305aa17ad60a73b1da25f575e862f4c3fbe2a30f64791ec13854a1acb"},"schema_version":"1.0"},"canonical_sha256":"01d402d58df7ece82243cbc5e6b3ebc57173e9dbe9ce3b02eeaf836eb28682e9","source":{"kind":"arxiv","id":"1108.0604","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.0604","created_at":"2026-05-18T02:01:04Z"},{"alias_kind":"arxiv_version","alias_value":"1108.0604v2","created_at":"2026-05-18T02:01:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.0604","created_at":"2026-05-18T02:01:04Z"},{"alias_kind":"pith_short_12","alias_value":"AHKAFVMN67WO","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"AHKAFVMN67WOQISD","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"AHKAFVMN","created_at":"2026-05-18T12:26:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:AHKAFVMN67WOQISDZPC6NM7LYV","target":"record","payload":{"canonical_record":{"source":{"id":"1108.0604","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-08-02T16:03:03Z","cross_cats_sorted":[],"title_canon_sha256":"dbac6499cbd5c34b6040922a894da26629b6e715662b644e11f4b4b3efd41438","abstract_canon_sha256":"2e7e962305aa17ad60a73b1da25f575e862f4c3fbe2a30f64791ec13854a1acb"},"schema_version":"1.0"},"canonical_sha256":"01d402d58df7ece82243cbc5e6b3ebc57173e9dbe9ce3b02eeaf836eb28682e9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:04.196356Z","signature_b64":"u7GKZGMPJ36S0lXLSMQh4EFwcRNi2+LcN0KGRWE0wFMpKJ4X9SL8zq3UTIumjE3P1ghFGKfsizvfi/LbcG4lDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"01d402d58df7ece82243cbc5e6b3ebc57173e9dbe9ce3b02eeaf836eb28682e9","last_reissued_at":"2026-05-18T02:01:04.195671Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:04.195671Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1108.0604","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:01:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kE3vnXufyqJOVC2jQe+wqGs1PVO2TW7IHTLBH3aXifn+eU7JS80QOOoHn60pyE/oa9cGsA8EDX+0mT0Az/Y3Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T21:22:23.199411Z"},"content_sha256":"a2937c7f168a9d9631563c4869d76d514c8154857aef8d668a60d1c4fcd68a3d","schema_version":"1.0","event_id":"sha256:a2937c7f168a9d9631563c4869d76d514c8154857aef8d668a60d1c4fcd68a3d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:AHKAFVMN67WOQISDZPC6NM7LYV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"H2CO in the Horsehead PDR: Photo-desorption of dust grain ice mantles","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"E. Roueff, J. Pety, J.R. Goicoechea, M. Gerin, V. Guzm\\'an","submitted_at":"2011-08-02T16:03:03Z","abstract_excerpt":"Aims: For the first time we investigate the role of the grain surface chemistry in the Horsehead Photo-dissociation region (PDR). Methods: We performed deep observations of several H2CO rotational lines toward the PDR and its associated dense-core in the Horsehead nebula, where the dust is cold ($\\Td \\simeq 20-30$ K). We complemented these observations with a map of the p-H2CO $~3_{03}-2_{02}$ line at 218.2 GHz (with 12\" angular resolution). We determine the H2CO abundances using a detailed radiative transfer analysis and compare these results with PDR models that include either pure gas-phase"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.0604","kind":"arxiv","version":2},"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":"2026-05-18T02:01:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fCtAkDSTb60Iz2ten+60HArp7P+ojxpFtWe6OO0VTs1cUt8aWu8CTYxjd7by1s2DW8hZT14MhYLEZlzQHadhAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T21:22:23.200080Z"},"content_sha256":"a3688b1a7113a04027b3aa0abdeaf28d7032642bbf11b7bc6ea8fd47c538851a","schema_version":"1.0","event_id":"sha256:a3688b1a7113a04027b3aa0abdeaf28d7032642bbf11b7bc6ea8fd47c538851a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AHKAFVMN67WOQISDZPC6NM7LYV/bundle.json","state_url":"https://pith.science/pith/AHKAFVMN67WOQISDZPC6NM7LYV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AHKAFVMN67WOQISDZPC6NM7LYV/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":"2026-05-29T21:22:23Z","links":{"resolver":"https://pith.science/pith/AHKAFVMN67WOQISDZPC6NM7LYV","bundle":"https://pith.science/pith/AHKAFVMN67WOQISDZPC6NM7LYV/bundle.json","state":"https://pith.science/pith/AHKAFVMN67WOQISDZPC6NM7LYV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AHKAFVMN67WOQISDZPC6NM7LYV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:AHKAFVMN67WOQISDZPC6NM7LYV","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":"2e7e962305aa17ad60a73b1da25f575e862f4c3fbe2a30f64791ec13854a1acb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-08-02T16:03:03Z","title_canon_sha256":"dbac6499cbd5c34b6040922a894da26629b6e715662b644e11f4b4b3efd41438"},"schema_version":"1.0","source":{"id":"1108.0604","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.0604","created_at":"2026-05-18T02:01:04Z"},{"alias_kind":"arxiv_version","alias_value":"1108.0604v2","created_at":"2026-05-18T02:01:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.0604","created_at":"2026-05-18T02:01:04Z"},{"alias_kind":"pith_short_12","alias_value":"AHKAFVMN67WO","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"AHKAFVMN67WOQISD","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"AHKAFVMN","created_at":"2026-05-18T12:26:24Z"}],"graph_snapshots":[{"event_id":"sha256:a3688b1a7113a04027b3aa0abdeaf28d7032642bbf11b7bc6ea8fd47c538851a","target":"graph","created_at":"2026-05-18T02:01:04Z","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":"Aims: For the first time we investigate the role of the grain surface chemistry in the Horsehead Photo-dissociation region (PDR). Methods: We performed deep observations of several H2CO rotational lines toward the PDR and its associated dense-core in the Horsehead nebula, where the dust is cold ($\\Td \\simeq 20-30$ K). We complemented these observations with a map of the p-H2CO $~3_{03}-2_{02}$ line at 218.2 GHz (with 12\" angular resolution). We determine the H2CO abundances using a detailed radiative transfer analysis and compare these results with PDR models that include either pure gas-phase","authors_text":"E. Roueff, J. Pety, J.R. Goicoechea, M. Gerin, V. Guzm\\'an","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-08-02T16:03:03Z","title":"H2CO in the Horsehead PDR: Photo-desorption of dust grain ice mantles"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.0604","kind":"arxiv","version":2},"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:a2937c7f168a9d9631563c4869d76d514c8154857aef8d668a60d1c4fcd68a3d","target":"record","created_at":"2026-05-18T02:01:04Z","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":"2e7e962305aa17ad60a73b1da25f575e862f4c3fbe2a30f64791ec13854a1acb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-08-02T16:03:03Z","title_canon_sha256":"dbac6499cbd5c34b6040922a894da26629b6e715662b644e11f4b4b3efd41438"},"schema_version":"1.0","source":{"id":"1108.0604","kind":"arxiv","version":2}},"canonical_sha256":"01d402d58df7ece82243cbc5e6b3ebc57173e9dbe9ce3b02eeaf836eb28682e9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"01d402d58df7ece82243cbc5e6b3ebc57173e9dbe9ce3b02eeaf836eb28682e9","first_computed_at":"2026-05-18T02:01:04.195671Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:04.195671Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"u7GKZGMPJ36S0lXLSMQh4EFwcRNi2+LcN0KGRWE0wFMpKJ4X9SL8zq3UTIumjE3P1ghFGKfsizvfi/LbcG4lDA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:04.196356Z","signed_message":"canonical_sha256_bytes"},"source_id":"1108.0604","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a2937c7f168a9d9631563c4869d76d514c8154857aef8d668a60d1c4fcd68a3d","sha256:a3688b1a7113a04027b3aa0abdeaf28d7032642bbf11b7bc6ea8fd47c538851a"],"state_sha256":"0742a328f5564d4e088c2ec21d78e1a879b7baed96e205c0dc7dad794843881f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fjWrqkJeGKsvMv43CjbNzcPLXeRYhE0E/aVVKOU9ISTpBbi2/yv1erHQPjcncEAuWyZymxG2vOk888iNDYU5CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T21:22:23.203821Z","bundle_sha256":"ff004e0998fe05072ce1ed4a04d66425952bd758e479cc84b9e891ea5923b66c"}}