{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:5AEYO4YHROW2YXVDM7TN5I5UXR","short_pith_number":"pith:5AEYO4YH","canonical_record":{"source":{"id":"2607.26189","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-07-28T18:49:25Z","cross_cats_sorted":[],"title_canon_sha256":"18de9e951ab1a8370e67a4d4f49b51c1d77b19087d3e63e6f6feaf4c7f80ef77","abstract_canon_sha256":"ab67cb74f0056b3ee97b9f9b9d3a077cbe4ba61409b22650d60cf69def912c66"},"schema_version":"1.0"},"canonical_sha256":"e8098773078badac5ea367e6dea3b4bc483a38c1d679a6f6cf8f1057335b1424","source":{"kind":"arxiv","id":"2607.26189","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.26189","created_at":"2026-07-30T00:08:40Z"},{"alias_kind":"arxiv_version","alias_value":"2607.26189v1","created_at":"2026-07-30T00:08:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.26189","created_at":"2026-07-30T00:08:40Z"},{"alias_kind":"pith_short_12","alias_value":"5AEYO4YHROW2","created_at":"2026-07-30T00:08:40Z"},{"alias_kind":"pith_short_16","alias_value":"5AEYO4YHROW2YXVD","created_at":"2026-07-30T00:08:40Z"},{"alias_kind":"pith_short_8","alias_value":"5AEYO4YH","created_at":"2026-07-30T00:08:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:5AEYO4YHROW2YXVDM7TN5I5UXR","target":"record","payload":{"canonical_record":{"source":{"id":"2607.26189","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-07-28T18:49:25Z","cross_cats_sorted":[],"title_canon_sha256":"18de9e951ab1a8370e67a4d4f49b51c1d77b19087d3e63e6f6feaf4c7f80ef77","abstract_canon_sha256":"ab67cb74f0056b3ee97b9f9b9d3a077cbe4ba61409b22650d60cf69def912c66"},"schema_version":"1.0"},"canonical_sha256":"e8098773078badac5ea367e6dea3b4bc483a38c1d679a6f6cf8f1057335b1424","receipt":{"kind":"pith_receipt","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e8098773078badac5ea367e6dea3b4bc483a38c1d679a6f6cf8f1057335b1424","last_reissued_at":"2026-07-30T00:08:40.682600Z","signature_status":"unsigned_v0","first_computed_at":"2026-07-30T00:08:40.682600Z"},"source_kind":"arxiv","source_id":"2607.26189","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":"2026-07-30T00:08:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"azHknh6KR7rLi+NB58hRDD3AYZka1yVyzXteDE6R88FQmOooSVx2InWhaipmhsa3t7mfLuqSIK1xYtpCuhELBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T17:56:45.838712Z"},"content_sha256":"b75ae70a1aba99adec00561c7f8885647352fbc58a6acef85e10d3a83ac6279c","schema_version":"1.0","event_id":"sha256:b75ae70a1aba99adec00561c7f8885647352fbc58a6acef85e10d3a83ac6279c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:5AEYO4YHROW2YXVDM7TN5I5UXR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"HCO$^+$ and the Effect of Mixing in SN 1987A","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. M. S. Richards (Manchester), Cardiff, C. Fransson (Stockholm University), F. D. Priestley (Cardiff), H. L. Gomez (Cardiff), H. M. Davies, J. Larsson (KTH Royal Institute of Technology), Maynooth University), M. J. Barlow (UCL), M. Matsuura, National Radio Astronomy Observatory), P. Cigan (George Mason University, R. Indebetouw (University of Virginia, R. Wesson (UCL, United States Naval Observatory)","submitted_at":"2026-07-28T18:49:25Z","abstract_excerpt":"We present high angular resolution observations of the HCO$^+$ emission in the central ejecta of the supernova remnant SN 1987A using the Atacama Large Millimeter Array (ALMA). We use this to infer the degree and type of mixing required within the ejecta in order to form HCO$^+$. The distribution of the $J=3-2$ HCO$^+$ emission is co-spatial with that of the $J=2-1$ CO emission, with an overlap between their brightest peaks. The correlation between the two molecules is strong and suggests that HCO$^+$ could form from reactions involving CO. We obtain additional observations of the $J=4-3$ HCO$"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.26189","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/2607.26189/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":"2026-07-30T00:08:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RM6iEe0CcfTsfWmYz75xl6IjojgIk/5nCSbz1zhQ5/XbW1MNiXAWufjiNWfBueelaTQ86MVlrVCY/daU4U5fCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T17:56:45.839681Z"},"content_sha256":"7303dc6fb915447a899b4b686e84c4f2d77ebc1aff0f9089d3d28df6ba992a31","schema_version":"1.0","event_id":"sha256:7303dc6fb915447a899b4b686e84c4f2d77ebc1aff0f9089d3d28df6ba992a31"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5AEYO4YHROW2YXVDM7TN5I5UXR/bundle.json","state_url":"https://pith.science/pith/5AEYO4YHROW2YXVDM7TN5I5UXR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5AEYO4YHROW2YXVDM7TN5I5UXR/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":"2026-08-03T17:56:45Z","links":{"resolver":"https://pith.science/pith/5AEYO4YHROW2YXVDM7TN5I5UXR","bundle":"https://pith.science/pith/5AEYO4YHROW2YXVDM7TN5I5UXR/bundle.json","state":"https://pith.science/pith/5AEYO4YHROW2YXVDM7TN5I5UXR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5AEYO4YHROW2YXVDM7TN5I5UXR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:5AEYO4YHROW2YXVDM7TN5I5UXR","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":"ab67cb74f0056b3ee97b9f9b9d3a077cbe4ba61409b22650d60cf69def912c66","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-07-28T18:49:25Z","title_canon_sha256":"18de9e951ab1a8370e67a4d4f49b51c1d77b19087d3e63e6f6feaf4c7f80ef77"},"schema_version":"1.0","source":{"id":"2607.26189","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.26189","created_at":"2026-07-30T00:08:40Z"},{"alias_kind":"arxiv_version","alias_value":"2607.26189v1","created_at":"2026-07-30T00:08:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.26189","created_at":"2026-07-30T00:08:40Z"},{"alias_kind":"pith_short_12","alias_value":"5AEYO4YHROW2","created_at":"2026-07-30T00:08:40Z"},{"alias_kind":"pith_short_16","alias_value":"5AEYO4YHROW2YXVD","created_at":"2026-07-30T00:08:40Z"},{"alias_kind":"pith_short_8","alias_value":"5AEYO4YH","created_at":"2026-07-30T00:08:40Z"}],"graph_snapshots":[{"event_id":"sha256:7303dc6fb915447a899b4b686e84c4f2d77ebc1aff0f9089d3d28df6ba992a31","target":"graph","created_at":"2026-07-30T00:08:40Z","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/2607.26189/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present high angular resolution observations of the HCO$^+$ emission in the central ejecta of the supernova remnant SN 1987A using the Atacama Large Millimeter Array (ALMA). We use this to infer the degree and type of mixing required within the ejecta in order to form HCO$^+$. The distribution of the $J=3-2$ HCO$^+$ emission is co-spatial with that of the $J=2-1$ CO emission, with an overlap between their brightest peaks. The correlation between the two molecules is strong and suggests that HCO$^+$ could form from reactions involving CO. We obtain additional observations of the $J=4-3$ HCO$","authors_text":"A. M. S. Richards (Manchester), Cardiff, C. Fransson (Stockholm University), F. D. Priestley (Cardiff), H. L. Gomez (Cardiff), H. M. Davies, J. Larsson (KTH Royal Institute of Technology), Maynooth University), M. J. Barlow (UCL), M. Matsuura, National Radio Astronomy Observatory), P. Cigan (George Mason University, R. Indebetouw (University of Virginia, R. Wesson (UCL, United States Naval Observatory)","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-07-28T18:49:25Z","title":"HCO$^+$ and the Effect of Mixing in SN 1987A"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.26189","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:b75ae70a1aba99adec00561c7f8885647352fbc58a6acef85e10d3a83ac6279c","target":"record","created_at":"2026-07-30T00:08:40Z","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":"ab67cb74f0056b3ee97b9f9b9d3a077cbe4ba61409b22650d60cf69def912c66","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-07-28T18:49:25Z","title_canon_sha256":"18de9e951ab1a8370e67a4d4f49b51c1d77b19087d3e63e6f6feaf4c7f80ef77"},"schema_version":"1.0","source":{"id":"2607.26189","kind":"arxiv","version":1}},"canonical_sha256":"e8098773078badac5ea367e6dea3b4bc483a38c1d679a6f6cf8f1057335b1424","receipt":{"builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e8098773078badac5ea367e6dea3b4bc483a38c1d679a6f6cf8f1057335b1424","first_computed_at":"2026-07-30T00:08:40.682600Z","kind":"pith_receipt","last_reissued_at":"2026-07-30T00:08:40.682600Z","receipt_version":"0.3","signature_status":"unsigned_v0"},"source_id":"2607.26189","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b75ae70a1aba99adec00561c7f8885647352fbc58a6acef85e10d3a83ac6279c","sha256:7303dc6fb915447a899b4b686e84c4f2d77ebc1aff0f9089d3d28df6ba992a31"],"state_sha256":"e5d0df74f3c7075d68492b12761ef19e4600fd0cd86fdf65834854e83e0859f1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cq+rmBOhppFUcVtE/eUjyLJHpg78XCJM+POWYliD3QFpPm20KSYh22mbzA2kLi0mEQeLMTGN3dIk5SqASSZWCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T17:56:45.845953Z","bundle_sha256":"1fb8e902c9187197b70061f9c31a93280f5d0a89502c2e7a897f642cd1e49f9a"}}