{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:HPMZXXX4MHMEJEPGPXZ3J7ZZRT","short_pith_number":"pith:HPMZXXX4","canonical_record":{"source":{"id":"1011.2638","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-11-11T12:49:51Z","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"title_canon_sha256":"98751833b9c16e0e9bb78e43658f408a3a12d793131e7a6f98dd5964909520a6","abstract_canon_sha256":"79961073611be727d7923dbff2acb4df024f5559a9f59926ef4b4c3b5b1039db"},"schema_version":"1.0"},"canonical_sha256":"3bd99bdefc61d84491e67df3b4ff398cee1e7747f6578bdd2a714678e88da291","source":{"kind":"arxiv","id":"1011.2638","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1011.2638","created_at":"2026-05-18T02:04:48Z"},{"alias_kind":"arxiv_version","alias_value":"1011.2638v1","created_at":"2026-05-18T02:04:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1011.2638","created_at":"2026-05-18T02:04:48Z"},{"alias_kind":"pith_short_12","alias_value":"HPMZXXX4MHME","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_16","alias_value":"HPMZXXX4MHMEJEPG","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_8","alias_value":"HPMZXXX4","created_at":"2026-05-18T12:26:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:HPMZXXX4MHMEJEPGPXZ3J7ZZRT","target":"record","payload":{"canonical_record":{"source":{"id":"1011.2638","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-11-11T12:49:51Z","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"title_canon_sha256":"98751833b9c16e0e9bb78e43658f408a3a12d793131e7a6f98dd5964909520a6","abstract_canon_sha256":"79961073611be727d7923dbff2acb4df024f5559a9f59926ef4b4c3b5b1039db"},"schema_version":"1.0"},"canonical_sha256":"3bd99bdefc61d84491e67df3b4ff398cee1e7747f6578bdd2a714678e88da291","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:04:48.857335Z","signature_b64":"JkGafF0y9HmlnCL9J4i84TnAMaNA4rWFIPfWT5ISHuUXQ8PY0i5wFWHRQmVYpRWidrPpf5jszYd88JPpqk7GDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3bd99bdefc61d84491e67df3b4ff398cee1e7747f6578bdd2a714678e88da291","last_reissued_at":"2026-05-18T02:04:48.856456Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:04:48.856456Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1011.2638","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":"2026-05-18T02:04:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZPDokeNw+FQtgl7u7c/rGhxr5vpL/OVM2lMQ+uA/4sZD6n4k8JpTIUWvRuTy5tOthbKPgSB6L+SdJHuWY63KCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T01:37:56.483852Z"},"content_sha256":"4e306bc974d1a809623060f2dfe933d40f12a5e045f35ee7ea08da90cd7624c1","schema_version":"1.0","event_id":"sha256:4e306bc974d1a809623060f2dfe933d40f12a5e045f35ee7ea08da90cd7624c1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:HPMZXXX4MHMEJEPGPXZ3J7ZZRT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Tails of the Unexpected: The Interaction of an Isothermal Shell with a Cloud","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"J. M. Pittard","submitted_at":"2010-11-11T12:49:51Z","abstract_excerpt":"A new mechanism for the formation of cometary tails behind dense clouds or globules is discussed. Numerical hydrodynamical models show that when a dense shell of swept-up matter overruns a cloud, material in the shell is focussed behind the cloud to form a tail. This mode of tail formation is completely distinct from other methods, which involve either the removal of material from the cloud, or shadowing from a strong, nearby source of ionization. This mechanism is relevant to the cometary tails seen in planetary nebulae and to the interaction of superbubble shells with dense clouds."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.2638","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":"2026-05-18T02:04:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+rnWSyAI9IGDHJEbLG0kk/ocK5ZgU9wDXvbXYI1uqEQxbVhjWrHcj3KAUXJPOd5pxMnYjxKsI84IfxOKU+DLCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T01:37:56.484205Z"},"content_sha256":"82519a6a22d107fbf4139876a4335fed43d2a68976a3c515028b97ed0b9dc201","schema_version":"1.0","event_id":"sha256:82519a6a22d107fbf4139876a4335fed43d2a68976a3c515028b97ed0b9dc201"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HPMZXXX4MHMEJEPGPXZ3J7ZZRT/bundle.json","state_url":"https://pith.science/pith/HPMZXXX4MHMEJEPGPXZ3J7ZZRT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HPMZXXX4MHMEJEPGPXZ3J7ZZRT/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":"2026-05-28T01:37:56Z","links":{"resolver":"https://pith.science/pith/HPMZXXX4MHMEJEPGPXZ3J7ZZRT","bundle":"https://pith.science/pith/HPMZXXX4MHMEJEPGPXZ3J7ZZRT/bundle.json","state":"https://pith.science/pith/HPMZXXX4MHMEJEPGPXZ3J7ZZRT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HPMZXXX4MHMEJEPGPXZ3J7ZZRT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:HPMZXXX4MHMEJEPGPXZ3J7ZZRT","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":"79961073611be727d7923dbff2acb4df024f5559a9f59926ef4b4c3b5b1039db","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-11-11T12:49:51Z","title_canon_sha256":"98751833b9c16e0e9bb78e43658f408a3a12d793131e7a6f98dd5964909520a6"},"schema_version":"1.0","source":{"id":"1011.2638","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1011.2638","created_at":"2026-05-18T02:04:48Z"},{"alias_kind":"arxiv_version","alias_value":"1011.2638v1","created_at":"2026-05-18T02:04:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1011.2638","created_at":"2026-05-18T02:04:48Z"},{"alias_kind":"pith_short_12","alias_value":"HPMZXXX4MHME","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_16","alias_value":"HPMZXXX4MHMEJEPG","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_8","alias_value":"HPMZXXX4","created_at":"2026-05-18T12:26:07Z"}],"graph_snapshots":[{"event_id":"sha256:82519a6a22d107fbf4139876a4335fed43d2a68976a3c515028b97ed0b9dc201","target":"graph","created_at":"2026-05-18T02:04:48Z","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":"A new mechanism for the formation of cometary tails behind dense clouds or globules is discussed. Numerical hydrodynamical models show that when a dense shell of swept-up matter overruns a cloud, material in the shell is focussed behind the cloud to form a tail. This mode of tail formation is completely distinct from other methods, which involve either the removal of material from the cloud, or shadowing from a strong, nearby source of ionization. This mechanism is relevant to the cometary tails seen in planetary nebulae and to the interaction of superbubble shells with dense clouds.","authors_text":"J. M. Pittard","cross_cats":["astro-ph.CO","astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-11-11T12:49:51Z","title":"Tails of the Unexpected: The Interaction of an Isothermal Shell with a Cloud"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.2638","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":"sha256:4e306bc974d1a809623060f2dfe933d40f12a5e045f35ee7ea08da90cd7624c1","target":"record","created_at":"2026-05-18T02:04:48Z","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":"79961073611be727d7923dbff2acb4df024f5559a9f59926ef4b4c3b5b1039db","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-11-11T12:49:51Z","title_canon_sha256":"98751833b9c16e0e9bb78e43658f408a3a12d793131e7a6f98dd5964909520a6"},"schema_version":"1.0","source":{"id":"1011.2638","kind":"arxiv","version":1}},"canonical_sha256":"3bd99bdefc61d84491e67df3b4ff398cee1e7747f6578bdd2a714678e88da291","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3bd99bdefc61d84491e67df3b4ff398cee1e7747f6578bdd2a714678e88da291","first_computed_at":"2026-05-18T02:04:48.856456Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:04:48.856456Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JkGafF0y9HmlnCL9J4i84TnAMaNA4rWFIPfWT5ISHuUXQ8PY0i5wFWHRQmVYpRWidrPpf5jszYd88JPpqk7GDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:04:48.857335Z","signed_message":"canonical_sha256_bytes"},"source_id":"1011.2638","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4e306bc974d1a809623060f2dfe933d40f12a5e045f35ee7ea08da90cd7624c1","sha256:82519a6a22d107fbf4139876a4335fed43d2a68976a3c515028b97ed0b9dc201"],"state_sha256":"eb9f298a81aa97e899ecbb4124b8e3984f03ca6979290418bc8a88de2824dcf2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jJFBj2NWhrMOXZQwH5ztMh4NTa5GmKAdwumYxUz5MgKjmEWWpMIs9W92AZj8rlI+CVhEasbbF2z/RdIycy5/CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T01:37:56.486234Z","bundle_sha256":"fccd6925dc772aa1fe6195407fa47d386a4512df7eaf40ebf777c4f5dca6b937"}}