{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:BTTYKPIS74V7SNINBKDP34R2IQ","short_pith_number":"pith:BTTYKPIS","canonical_record":{"source":{"id":"1701.07057","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-01-24T19:47:09Z","cross_cats_sorted":["astro-ph.HE","astro-ph.SR"],"title_canon_sha256":"ff9e1ebf515b123de4de9f1184549f446815ea3e348c300af121b01297034814","abstract_canon_sha256":"5823481f313b66ff0f73aad03e57c5caeb8b5432162a787ddc2f727dac6f2a32"},"schema_version":"1.0"},"canonical_sha256":"0ce7853d12ff2bf9350d0a86fdf23a44133cadaab9283b493319cd9288864194","source":{"kind":"arxiv","id":"1701.07057","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.07057","created_at":"2026-05-17T23:58:42Z"},{"alias_kind":"arxiv_version","alias_value":"1701.07057v2","created_at":"2026-05-17T23:58:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.07057","created_at":"2026-05-17T23:58:42Z"},{"alias_kind":"pith_short_12","alias_value":"BTTYKPIS74V7","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_16","alias_value":"BTTYKPIS74V7SNIN","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_8","alias_value":"BTTYKPIS","created_at":"2026-05-18T12:31:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:BTTYKPIS74V7SNINBKDP34R2IQ","target":"record","payload":{"canonical_record":{"source":{"id":"1701.07057","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-01-24T19:47:09Z","cross_cats_sorted":["astro-ph.HE","astro-ph.SR"],"title_canon_sha256":"ff9e1ebf515b123de4de9f1184549f446815ea3e348c300af121b01297034814","abstract_canon_sha256":"5823481f313b66ff0f73aad03e57c5caeb8b5432162a787ddc2f727dac6f2a32"},"schema_version":"1.0"},"canonical_sha256":"0ce7853d12ff2bf9350d0a86fdf23a44133cadaab9283b493319cd9288864194","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:58:42.563618Z","signature_b64":"s4IbLEoaYLlhSFU1Y+kZUJHn90C7waFZ4zalG3V5rwQtehnWRXihOsQkxLOgH7I0kCnXHf0l3fIun8DyOisWBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0ce7853d12ff2bf9350d0a86fdf23a44133cadaab9283b493319cd9288864194","last_reissued_at":"2026-05-17T23:58:42.563047Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:58:42.563047Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1701.07057","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":"2026-05-17T23:58:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sASitOTetKv5FogPyzp6yoQYpNFECpoPd/ttWnlWMK/UVIAxvY5Q3SJTxYQJPRUffkloaLDFBf2p79JKSNbHBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T19:36:51.121766Z"},"content_sha256":"31dc483983fe65426f8b49c2a6438d0f40baac6aecf6d5102761f18b79a09468","schema_version":"1.0","event_id":"sha256:31dc483983fe65426f8b49c2a6438d0f40baac6aecf6d5102761f18b79a09468"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:BTTYKPIS74V7SNINBKDP34R2IQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Inferring Properties of the ISM from Supernova Remnant Size Distributions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"Benjamin D. Elwood, Jeremiah W. Murphy, Mariangelly Diaz","submitted_at":"2017-01-24T19:47:09Z","abstract_excerpt":"We model the size distribution of supernova remnants to infer the surrounding ISM density. Using simple, yet standard SNR evolution models, we find that the distribution of ambient densities is remarkably narrow; either the standard assumptions about SNR evolution are wrong, or observable SNRs are biased to a narrow range of ambient densities. We show that the size distributions are consistent with log-normal, which severely limits the number of model parameters in any SNR population synthesis model. Simple Monte Carlo simulations demonstrate that the size distribution is indistinguishable fro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.07057","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":"2026-05-17T23:58:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e2mNf5tEwRWSrdatrfRBm/RI6fviEMVtbVQ+t7l5UWOkXyBDHqvsRm7JKEOVTNO6zr1JvhnHSEXGHCGxHNlxCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T19:36:51.122539Z"},"content_sha256":"708c59c18a25c22d16cee6fc361c0477f550ad9682615854654a9146e5b35e65","schema_version":"1.0","event_id":"sha256:708c59c18a25c22d16cee6fc361c0477f550ad9682615854654a9146e5b35e65"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BTTYKPIS74V7SNINBKDP34R2IQ/bundle.json","state_url":"https://pith.science/pith/BTTYKPIS74V7SNINBKDP34R2IQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BTTYKPIS74V7SNINBKDP34R2IQ/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":"2026-06-11T19:36:51Z","links":{"resolver":"https://pith.science/pith/BTTYKPIS74V7SNINBKDP34R2IQ","bundle":"https://pith.science/pith/BTTYKPIS74V7SNINBKDP34R2IQ/bundle.json","state":"https://pith.science/pith/BTTYKPIS74V7SNINBKDP34R2IQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BTTYKPIS74V7SNINBKDP34R2IQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:BTTYKPIS74V7SNINBKDP34R2IQ","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":"5823481f313b66ff0f73aad03e57c5caeb8b5432162a787ddc2f727dac6f2a32","cross_cats_sorted":["astro-ph.HE","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-01-24T19:47:09Z","title_canon_sha256":"ff9e1ebf515b123de4de9f1184549f446815ea3e348c300af121b01297034814"},"schema_version":"1.0","source":{"id":"1701.07057","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.07057","created_at":"2026-05-17T23:58:42Z"},{"alias_kind":"arxiv_version","alias_value":"1701.07057v2","created_at":"2026-05-17T23:58:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.07057","created_at":"2026-05-17T23:58:42Z"},{"alias_kind":"pith_short_12","alias_value":"BTTYKPIS74V7","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_16","alias_value":"BTTYKPIS74V7SNIN","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_8","alias_value":"BTTYKPIS","created_at":"2026-05-18T12:31:08Z"}],"graph_snapshots":[{"event_id":"sha256:708c59c18a25c22d16cee6fc361c0477f550ad9682615854654a9146e5b35e65","target":"graph","created_at":"2026-05-17T23:58:42Z","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":"We model the size distribution of supernova remnants to infer the surrounding ISM density. Using simple, yet standard SNR evolution models, we find that the distribution of ambient densities is remarkably narrow; either the standard assumptions about SNR evolution are wrong, or observable SNRs are biased to a narrow range of ambient densities. We show that the size distributions are consistent with log-normal, which severely limits the number of model parameters in any SNR population synthesis model. Simple Monte Carlo simulations demonstrate that the size distribution is indistinguishable fro","authors_text":"Benjamin D. Elwood, Jeremiah W. Murphy, Mariangelly Diaz","cross_cats":["astro-ph.HE","astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-01-24T19:47:09Z","title":"Inferring Properties of the ISM from Supernova Remnant Size Distributions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.07057","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":"sha256:31dc483983fe65426f8b49c2a6438d0f40baac6aecf6d5102761f18b79a09468","target":"record","created_at":"2026-05-17T23:58:42Z","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":"5823481f313b66ff0f73aad03e57c5caeb8b5432162a787ddc2f727dac6f2a32","cross_cats_sorted":["astro-ph.HE","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-01-24T19:47:09Z","title_canon_sha256":"ff9e1ebf515b123de4de9f1184549f446815ea3e348c300af121b01297034814"},"schema_version":"1.0","source":{"id":"1701.07057","kind":"arxiv","version":2}},"canonical_sha256":"0ce7853d12ff2bf9350d0a86fdf23a44133cadaab9283b493319cd9288864194","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0ce7853d12ff2bf9350d0a86fdf23a44133cadaab9283b493319cd9288864194","first_computed_at":"2026-05-17T23:58:42.563047Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:58:42.563047Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"s4IbLEoaYLlhSFU1Y+kZUJHn90C7waFZ4zalG3V5rwQtehnWRXihOsQkxLOgH7I0kCnXHf0l3fIun8DyOisWBg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:58:42.563618Z","signed_message":"canonical_sha256_bytes"},"source_id":"1701.07057","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:31dc483983fe65426f8b49c2a6438d0f40baac6aecf6d5102761f18b79a09468","sha256:708c59c18a25c22d16cee6fc361c0477f550ad9682615854654a9146e5b35e65"],"state_sha256":"c8bdc5b3b64508e90da95ef498bb51911a4f602d64701bb0468377cbd01bd0ff"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4ySVLjf1qodT8EJ0qTOVAxODfcd/9wLV9UE3H62EP4p9+1BOJksmXu9mjyqGA9uv0EIyEWDoEbpM1yX5T+bnDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T19:36:51.126118Z","bundle_sha256":"c54b12e0945135dbb5cdbf0babc173c836815c222c6ebf8a1a2f25623b0ffa06"}}