{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:L563NSQV2ZWCRMQSRI2M2OKCXX","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":"ccde9e0925eacc0385e6da0d677f3ba522007426820816f3dfb6b73cf1d49b54","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-12-17T02:15:02Z","title_canon_sha256":"24c3ed612a29d8831273674b45d76c4fa287dc96dc058256fbafc00682e3c9f2"},"schema_version":"1.0","source":{"id":"1512.05440","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.05440","created_at":"2026-05-18T01:19:57Z"},{"alias_kind":"arxiv_version","alias_value":"1512.05440v2","created_at":"2026-05-18T01:19:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.05440","created_at":"2026-05-18T01:19:57Z"},{"alias_kind":"pith_short_12","alias_value":"L563NSQV2ZWC","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"L563NSQV2ZWCRMQS","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"L563NSQV","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:f665354e59328f27d38b5a09d252d9a9cbebab1c454659e38d62875b359e90a0","target":"graph","created_at":"2026-05-18T01:19:57Z","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 report the first detection of a gap and a ring in 336 GHz dust continuum emission from the protoplanetary disk around TW Hya, using the Atacama Large Millimeter/Submillimeter Array (ALMA). The gap and ring are located at around 25 and 41 au from the central star, respectively, and are associated with the CO snow line at ~30 au. The gap has a radial width of less than 15 au and a mass deficit of more than 23%, taking into account that the observations are limited to an angular resolution of ~15 au. In addition, the 13CO and C18O J = 3 - 2 lines show a decrement in CO line emission throughout","authors_text":"Catherine Walsh, Daiki Ishimoto, Hideko Nomura, Kazuhiro D. Kanagawa, Ryohei Kawabe, Satoshi Okuzumi, Shigeru Ida, Takashi Tsukagoshi, Takayuki Muto, T.J. Millar, Xue-Ning Bai","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-12-17T02:15:02Z","title":"ALMA Observations of a Gap and a Ring in the Protoplanetary Disk around TW Hya"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.05440","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:ba950c8ef738439f85f262bf257367de1efbf1b9c56df743b21c3a9aaffa9cba","target":"record","created_at":"2026-05-18T01:19:57Z","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":"ccde9e0925eacc0385e6da0d677f3ba522007426820816f3dfb6b73cf1d49b54","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-12-17T02:15:02Z","title_canon_sha256":"24c3ed612a29d8831273674b45d76c4fa287dc96dc058256fbafc00682e3c9f2"},"schema_version":"1.0","source":{"id":"1512.05440","kind":"arxiv","version":2}},"canonical_sha256":"5f7db6ca15d66c28b2128a34cd3942bdcf9b98946db053b298d8893d1dfbc8ba","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5f7db6ca15d66c28b2128a34cd3942bdcf9b98946db053b298d8893d1dfbc8ba","first_computed_at":"2026-05-18T01:19:57.068089Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:19:57.068089Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"E5c0EiR05qOb6KExY3H1UJ0wLTaBAO+wxumKc5nHTjsMvboVd+v8BvMx/2pqIRDCPYfvhQdyZ4QnmvajzuQ6AA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:19:57.068679Z","signed_message":"canonical_sha256_bytes"},"source_id":"1512.05440","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ba950c8ef738439f85f262bf257367de1efbf1b9c56df743b21c3a9aaffa9cba","sha256:f665354e59328f27d38b5a09d252d9a9cbebab1c454659e38d62875b359e90a0"],"state_sha256":"026c2e0ea6376b89c01b0a83553a06eb90880cda55c7865387065898c90a458b"}