{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2025:J3KMSNRTIHKXBWC6UYEVUFWI6R","short_pith_number":"pith:J3KMSNRT","schema_version":"1.0","canonical_sha256":"4ed4c9363341d570d85ea6095a16c8f47798aea9dd999aeb3428b701680e6f7d","source":{"kind":"arxiv","id":"2506.07137","version":1},"attestation_state":"computed","paper":{"title":"The initial evolution of SN 1993J: Piston phase versus standard model","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"C.-I. Bjornsson","submitted_at":"2025-06-08T13:33:32Z","abstract_excerpt":"The evolution of SN 1993J is unlikely to be self-similar. Spatially resolved VLBI-observations show that the velocity of the outer rim of the radio emission region brakes at a few hundred days. The reason for this break remains largely unknown. It is argued here that it is due to the transition between an initial piston phase to a later phase, which is described by the standard model. The properties of the reverse shock are quite different for a piston phase as compared to the standard self-similar model. This affects the expected X-ray emission; for example, the reverse shock becomes transpar"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2506.07137","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-06-08T13:33:32Z","cross_cats_sorted":[],"title_canon_sha256":"027353da13d24555daa1fbf2ff2611e6f5ad7a975853360c5a8e187820928e27","abstract_canon_sha256":"39159db090e3a367b4e8709ae78319047a0290e2bc36d58f478ed37a78000de0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:18:02.233012Z","signature_b64":"Cc6Pbk9URBa3jPiPwig0pojBryQet87Fzk7eRQDZBcocYk9bcQFoU5OSebxFto+3pmpVuWlXEpZI/UJDq8eTAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4ed4c9363341d570d85ea6095a16c8f47798aea9dd999aeb3428b701680e6f7d","last_reissued_at":"2026-07-05T11:18:02.232543Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:18:02.232543Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The initial evolution of SN 1993J: Piston phase versus standard model","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"C.-I. Bjornsson","submitted_at":"2025-06-08T13:33:32Z","abstract_excerpt":"The evolution of SN 1993J is unlikely to be self-similar. Spatially resolved VLBI-observations show that the velocity of the outer rim of the radio emission region brakes at a few hundred days. The reason for this break remains largely unknown. It is argued here that it is due to the transition between an initial piston phase to a later phase, which is described by the standard model. The properties of the reverse shock are quite different for a piston phase as compared to the standard self-similar model. This affects the expected X-ray emission; for example, the reverse shock becomes transpar"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.07137","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/2506.07137/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2506.07137","created_at":"2026-07-05T11:18:02.232613+00:00"},{"alias_kind":"arxiv_version","alias_value":"2506.07137v1","created_at":"2026-07-05T11:18:02.232613+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.07137","created_at":"2026-07-05T11:18:02.232613+00:00"},{"alias_kind":"pith_short_12","alias_value":"J3KMSNRTIHKX","created_at":"2026-07-05T11:18:02.232613+00:00"},{"alias_kind":"pith_short_16","alias_value":"J3KMSNRTIHKXBWC6","created_at":"2026-07-05T11:18:02.232613+00:00"},{"alias_kind":"pith_short_8","alias_value":"J3KMSNRT","created_at":"2026-07-05T11:18:02.232613+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/J3KMSNRTIHKXBWC6UYEVUFWI6R","json":"https://pith.science/pith/J3KMSNRTIHKXBWC6UYEVUFWI6R.json","graph_json":"https://pith.science/api/pith-number/J3KMSNRTIHKXBWC6UYEVUFWI6R/graph.json","events_json":"https://pith.science/api/pith-number/J3KMSNRTIHKXBWC6UYEVUFWI6R/events.json","paper":"https://pith.science/paper/J3KMSNRT"},"agent_actions":{"view_html":"https://pith.science/pith/J3KMSNRTIHKXBWC6UYEVUFWI6R","download_json":"https://pith.science/pith/J3KMSNRTIHKXBWC6UYEVUFWI6R.json","view_paper":"https://pith.science/paper/J3KMSNRT","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2506.07137&json=true","fetch_graph":"https://pith.science/api/pith-number/J3KMSNRTIHKXBWC6UYEVUFWI6R/graph.json","fetch_events":"https://pith.science/api/pith-number/J3KMSNRTIHKXBWC6UYEVUFWI6R/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/J3KMSNRTIHKXBWC6UYEVUFWI6R/action/timestamp_anchor","attest_storage":"https://pith.science/pith/J3KMSNRTIHKXBWC6UYEVUFWI6R/action/storage_attestation","attest_author":"https://pith.science/pith/J3KMSNRTIHKXBWC6UYEVUFWI6R/action/author_attestation","sign_citation":"https://pith.science/pith/J3KMSNRTIHKXBWC6UYEVUFWI6R/action/citation_signature","submit_replication":"https://pith.science/pith/J3KMSNRTIHKXBWC6UYEVUFWI6R/action/replication_record"}},"created_at":"2026-07-05T11:18:02.232613+00:00","updated_at":"2026-07-05T11:18:02.232613+00:00"}