{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:WTVMPG2FYTPCIT7HMTHH4BJ7CN","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":"129778e9a860a771f0d83d062b80e005c37e24411f70461a0bde67ee9163e3a4","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-25T18:02:56Z","title_canon_sha256":"7722b2513fa1ec357e2709d6ce8415b279ac0dffdfde635bb3f7e9c630832ec8"},"schema_version":"1.0","source":{"id":"2108.11407","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.11407","created_at":"2026-07-05T03:34:33Z"},{"alias_kind":"arxiv_version","alias_value":"2108.11407v1","created_at":"2026-07-05T03:34:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.11407","created_at":"2026-07-05T03:34:33Z"},{"alias_kind":"pith_short_12","alias_value":"WTVMPG2FYTPC","created_at":"2026-07-05T03:34:33Z"},{"alias_kind":"pith_short_16","alias_value":"WTVMPG2FYTPCIT7H","created_at":"2026-07-05T03:34:33Z"},{"alias_kind":"pith_short_8","alias_value":"WTVMPG2F","created_at":"2026-07-05T03:34:33Z"}],"graph_snapshots":[{"event_id":"sha256:b2101c430e1d1045b836fd9d2e682f8815ea8dfd842e991fc47e3a6c2509bf62","target":"graph","created_at":"2026-07-05T03:34:33Z","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/2108.11407/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present deep Chandra X-ray observations of two nearby Type Ia supernovae, SN 2017cbv and SN 2020nlb, which reveal no X-ray emission down to a luminosity $L_X$$\\lesssim$5.3$\\times$10$^{37}$ and $\\lesssim$5.4$\\times$10$^{37}$ erg s$^{-1}$ (0.3--10 keV), respectively, at $\\sim$16--18 days after the explosion. With these limits, we constrain the pre-explosion mass-loss rate of the progenitor system to be $\\dot{M}$$<$7.2$\\times$10$^{-9}$ and $<$9.7$\\times$10$^{-9}$ M$_{\\odot}$ yr$^{-1}$ for each (at a wind velocity $v_w$=100 km s$^{-1}$ and a radius of $R$$\\approx$10$^{16}$ cm), assuming any X-r","authors_text":"C. McCully, C. Pellegrino, D. A. Howell, D. Hiramatsu, D. Janzen, D. J. Sand, D. Reichart, E. Y. Hsiao, J. Burke, J. E. Andrews, J. J. Swift, K. A. Bostroem, K. Itagaki, K. Misra, L. Chomiuk, L. Galbany, L. Wang, M. J. Lundquist, M. L. Graham, N. Smith, P. J. Brown, R. Dastidar, S. K. Sarbadhicary, S. Valenti, S. Wyatt, Y. Dong","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-25T18:02:56Z","title":"Circumstellar Medium Constraints on the Environment of Two Nearby Type Ia Supernovae: SN 2017cbv and SN 2020nlb"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.11407","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:f00d0b2edaa17c4baee0b78045030da4dfebd2cb70154418a6f1188a35fceac2","target":"record","created_at":"2026-07-05T03:34:33Z","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":"129778e9a860a771f0d83d062b80e005c37e24411f70461a0bde67ee9163e3a4","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-08-25T18:02:56Z","title_canon_sha256":"7722b2513fa1ec357e2709d6ce8415b279ac0dffdfde635bb3f7e9c630832ec8"},"schema_version":"1.0","source":{"id":"2108.11407","kind":"arxiv","version":1}},"canonical_sha256":"b4eac79b45c4de244fe764ce7e053f1343a7faed2c7be7deb8bb009cba590deb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b4eac79b45c4de244fe764ce7e053f1343a7faed2c7be7deb8bb009cba590deb","first_computed_at":"2026-07-05T03:34:33.756550Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:34:33.756550Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"l2Idl/WNQVDUuLOOrcPWOYqOkvZAU/HtNGPN3Mm3jskc3xLukUNQqRvsNOKM91uvm/FqhFAb+HZxr7wuwrsFAw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:34:33.757026Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.11407","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f00d0b2edaa17c4baee0b78045030da4dfebd2cb70154418a6f1188a35fceac2","sha256:b2101c430e1d1045b836fd9d2e682f8815ea8dfd842e991fc47e3a6c2509bf62"],"state_sha256":"4e3b997e40300aa7f247116e6d906ab7eef268c4f98cfa75167ba84a6fe4ebee"}