{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:KFR76T6WAE4BFRB6WJ7ZLYZIKK","short_pith_number":"pith:KFR76T6W","canonical_record":{"source":{"id":"0704.0463","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-04-03T21:26:16Z","cross_cats_sorted":[],"title_canon_sha256":"a1ca524273f9200361468b36469c4ba450689f01520d60c47ad7b140269239c3","abstract_canon_sha256":"d4ad4d07409f72ee16781599c610cf8cc4092ec5e3b924a44405a6bb30b21094"},"schema_version":"1.0"},"canonical_sha256":"5163ff4fd6013812c43eb27f95e32852a926d8d880c864903501a5bb01a59f65","source":{"kind":"arxiv","id":"0704.0463","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0704.0463","created_at":"2026-07-04T15:44:56Z"},{"alias_kind":"arxiv_version","alias_value":"0704.0463v1","created_at":"2026-07-04T15:44:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0704.0463","created_at":"2026-07-04T15:44:56Z"},{"alias_kind":"pith_short_12","alias_value":"KFR76T6WAE4B","created_at":"2026-07-04T15:44:56Z"},{"alias_kind":"pith_short_16","alias_value":"KFR76T6WAE4BFRB6","created_at":"2026-07-04T15:44:56Z"},{"alias_kind":"pith_short_8","alias_value":"KFR76T6W","created_at":"2026-07-04T15:44:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:KFR76T6WAE4BFRB6WJ7ZLYZIKK","target":"record","payload":{"canonical_record":{"source":{"id":"0704.0463","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-04-03T21:26:16Z","cross_cats_sorted":[],"title_canon_sha256":"a1ca524273f9200361468b36469c4ba450689f01520d60c47ad7b140269239c3","abstract_canon_sha256":"d4ad4d07409f72ee16781599c610cf8cc4092ec5e3b924a44405a6bb30b21094"},"schema_version":"1.0"},"canonical_sha256":"5163ff4fd6013812c43eb27f95e32852a926d8d880c864903501a5bb01a59f65","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:44:56.448357Z","signature_b64":"acrJ4E6Uazzdkh1HlIDtDZKP3bK99WvcuzU0H1s023eMROoBtEsFxmIyEjKilR8qvZt5Hum7Mtvt98Ql82MGAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5163ff4fd6013812c43eb27f95e32852a926d8d880c864903501a5bb01a59f65","last_reissued_at":"2026-07-04T15:44:56.447949Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:44:56.447949Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0704.0463","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":"2026-07-04T15:44:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4kK1qOomYCEpoNPOu0313Fb9dxhSTQiqgcp5MiZmtOKdiYEadYF5VrzRKzJpwGsLyzQtNmI/Ry6LBFG3dUJQBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T06:58:36.847577Z"},"content_sha256":"493a8cfc993cc5baddda514cbc70f3099200375d25335dc4b52bc08c0845f517","schema_version":"1.0","event_id":"sha256:493a8cfc993cc5baddda514cbc70f3099200375d25335dc4b52bc08c0845f517"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:KFR76T6WAE4BFRB6WJ7ZLYZIKK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Mass and Temperature of the TWA 7 Debris Disk","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"B. C. Matthews (Herzberg Institute of Astrophysics, Canada), M. C. Wyatt (University of Cambridge, P. G. Kalas (UC Berkeley, U.K.), U.S.A.)","submitted_at":"2007-04-03T21:26:16Z","abstract_excerpt":"We present photometric detections of dust emission at 850 and 450 micron around the pre-main sequence M1 dwarf TWA 7 using the SCUBA camera on the James Clerk Maxwell Telescope. These data confirm the presence of a cold dust disk around TWA 7, a member of the TW Hydrae Association. Based on the 850 micron flux, we estimate the mass of the disk to be 18 lunar masses (0.2 Earth masses) assuming a mass opacity of 1.7 cm^2/g with a temperature of 45 K. This makes the TWA 7 disk (d=55 pc) an order of magnitude more massive than the disk reported around AU Microscopii (GL 803), the closest (9.9 pc) "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0704.0463","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/0704.0463/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":"2026-07-04T15:44:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YiXMt8dTEfzvGIF6ZkiGtF6aaKvfCWYmqg19fKCjyuKEHn9IptbyH5jZGVadJmzXF5yGX+By4qj/pyxEDOqBDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T06:58:36.847923Z"},"content_sha256":"0d424267275d980ebbe9eae3260d5e6e7ee086c3534bf576239da3e8dd8d98dd","schema_version":"1.0","event_id":"sha256:0d424267275d980ebbe9eae3260d5e6e7ee086c3534bf576239da3e8dd8d98dd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KFR76T6WAE4BFRB6WJ7ZLYZIKK/bundle.json","state_url":"https://pith.science/pith/KFR76T6WAE4BFRB6WJ7ZLYZIKK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KFR76T6WAE4BFRB6WJ7ZLYZIKK/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":"2026-08-14T06:58:36Z","links":{"resolver":"https://pith.science/pith/KFR76T6WAE4BFRB6WJ7ZLYZIKK","bundle":"https://pith.science/pith/KFR76T6WAE4BFRB6WJ7ZLYZIKK/bundle.json","state":"https://pith.science/pith/KFR76T6WAE4BFRB6WJ7ZLYZIKK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KFR76T6WAE4BFRB6WJ7ZLYZIKK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:KFR76T6WAE4BFRB6WJ7ZLYZIKK","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":"d4ad4d07409f72ee16781599c610cf8cc4092ec5e3b924a44405a6bb30b21094","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-04-03T21:26:16Z","title_canon_sha256":"a1ca524273f9200361468b36469c4ba450689f01520d60c47ad7b140269239c3"},"schema_version":"1.0","source":{"id":"0704.0463","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0704.0463","created_at":"2026-07-04T15:44:56Z"},{"alias_kind":"arxiv_version","alias_value":"0704.0463v1","created_at":"2026-07-04T15:44:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0704.0463","created_at":"2026-07-04T15:44:56Z"},{"alias_kind":"pith_short_12","alias_value":"KFR76T6WAE4B","created_at":"2026-07-04T15:44:56Z"},{"alias_kind":"pith_short_16","alias_value":"KFR76T6WAE4BFRB6","created_at":"2026-07-04T15:44:56Z"},{"alias_kind":"pith_short_8","alias_value":"KFR76T6W","created_at":"2026-07-04T15:44:56Z"}],"graph_snapshots":[{"event_id":"sha256:0d424267275d980ebbe9eae3260d5e6e7ee086c3534bf576239da3e8dd8d98dd","target":"graph","created_at":"2026-07-04T15:44:56Z","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/0704.0463/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present photometric detections of dust emission at 850 and 450 micron around the pre-main sequence M1 dwarf TWA 7 using the SCUBA camera on the James Clerk Maxwell Telescope. These data confirm the presence of a cold dust disk around TWA 7, a member of the TW Hydrae Association. Based on the 850 micron flux, we estimate the mass of the disk to be 18 lunar masses (0.2 Earth masses) assuming a mass opacity of 1.7 cm^2/g with a temperature of 45 K. This makes the TWA 7 disk (d=55 pc) an order of magnitude more massive than the disk reported around AU Microscopii (GL 803), the closest (9.9 pc) ","authors_text":"B. C. Matthews (Herzberg Institute of Astrophysics, Canada), M. C. Wyatt (University of Cambridge, P. G. Kalas (UC Berkeley, U.K.), U.S.A.)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2007-04-03T21:26:16Z","title":"Mass and Temperature of the TWA 7 Debris Disk"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0704.0463","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":"sha256:493a8cfc993cc5baddda514cbc70f3099200375d25335dc4b52bc08c0845f517","target":"record","created_at":"2026-07-04T15:44:56Z","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":"d4ad4d07409f72ee16781599c610cf8cc4092ec5e3b924a44405a6bb30b21094","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-04-03T21:26:16Z","title_canon_sha256":"a1ca524273f9200361468b36469c4ba450689f01520d60c47ad7b140269239c3"},"schema_version":"1.0","source":{"id":"0704.0463","kind":"arxiv","version":1}},"canonical_sha256":"5163ff4fd6013812c43eb27f95e32852a926d8d880c864903501a5bb01a59f65","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5163ff4fd6013812c43eb27f95e32852a926d8d880c864903501a5bb01a59f65","first_computed_at":"2026-07-04T15:44:56.447949Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:44:56.447949Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"acrJ4E6Uazzdkh1HlIDtDZKP3bK99WvcuzU0H1s023eMROoBtEsFxmIyEjKilR8qvZt5Hum7Mtvt98Ql82MGAA==","signature_status":"signed_v1","signed_at":"2026-07-04T15:44:56.448357Z","signed_message":"canonical_sha256_bytes"},"source_id":"0704.0463","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:493a8cfc993cc5baddda514cbc70f3099200375d25335dc4b52bc08c0845f517","sha256:0d424267275d980ebbe9eae3260d5e6e7ee086c3534bf576239da3e8dd8d98dd"],"state_sha256":"ce26614a201a4ec2061280b6c9f05de6cb9d9de6618ad3adaac61ea71e66ff8a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KV7eqcEYtf46sQpINb6u6gX/bPl5aGbnJVk03xl8lmeethJKXOZh8NgLzvZySWzBaYKltfktDZa9dQNkPOT9Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T06:58:36.852153Z","bundle_sha256":"c67761b8382710eae26b1ea347fe75c54b1e2c22fb8acd5af7c8e94841a24a48"}}