{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:XGEHI5ZCKTJBKIUFVZKZYJ4NZB","short_pith_number":"pith:XGEHI5ZC","canonical_record":{"source":{"id":"0903.1255","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-03-06T17:00:48Z","cross_cats_sorted":[],"title_canon_sha256":"b2ee142e32a0bf5a801d3bc2a89991f7a6d405a3bc42c561a471c53f1cd260bc","abstract_canon_sha256":"e7aacc43ce620a6e1cf6c7398a9987b6c14a0be4141d00c10577068273c591ad"},"schema_version":"1.0"},"canonical_sha256":"b98874772254d2152285ae559c278dc87595e1ebf4718665000e65ea767c5ac6","source":{"kind":"arxiv","id":"0903.1255","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.1255","created_at":"2026-05-18T04:29:16Z"},{"alias_kind":"arxiv_version","alias_value":"0903.1255v1","created_at":"2026-05-18T04:29:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.1255","created_at":"2026-05-18T04:29:16Z"},{"alias_kind":"pith_short_12","alias_value":"XGEHI5ZCKTJB","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"XGEHI5ZCKTJBKIUF","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"XGEHI5ZC","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:XGEHI5ZCKTJBKIUFVZKZYJ4NZB","target":"record","payload":{"canonical_record":{"source":{"id":"0903.1255","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-03-06T17:00:48Z","cross_cats_sorted":[],"title_canon_sha256":"b2ee142e32a0bf5a801d3bc2a89991f7a6d405a3bc42c561a471c53f1cd260bc","abstract_canon_sha256":"e7aacc43ce620a6e1cf6c7398a9987b6c14a0be4141d00c10577068273c591ad"},"schema_version":"1.0"},"canonical_sha256":"b98874772254d2152285ae559c278dc87595e1ebf4718665000e65ea767c5ac6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:16.109279Z","signature_b64":"T5NqIPWjAnM5zxHgLduTBGknwicgYH6fRgFCIMjIeuoYrmrsm8yd8xbWidXdAFKShQQd0ER5HHA2V04fS4CzBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b98874772254d2152285ae559c278dc87595e1ebf4718665000e65ea767c5ac6","last_reissued_at":"2026-05-18T04:29:16.108805Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:16.108805Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0903.1255","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":"2026-05-18T04:29:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Km6ttSEl164avcaA1TOfQZMWIGS03QFje7sdxwb2WGjRKaQeexghhdS/8n+mtAVQSuvL52XGDjg845lsM3R3Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T21:05:26.659236Z"},"content_sha256":"62d86c766c2b837191c738cb046c0c39087792ab3af53f9b115d5fab0c4db91b","schema_version":"1.0","event_id":"sha256:62d86c766c2b837191c738cb046c0c39087792ab3af53f9b115d5fab0c4db91b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:XGEHI5ZCKTJBKIUFVZKZYJ4NZB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Polarimetry of DG Tau at 350 microns","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"G. Novak, H. Li, H. Shinnaga, J. Cho, J.E. Vaillancourt, M. Krejny, T. Matthews","submitted_at":"2009-03-06T17:00:48Z","abstract_excerpt":"We present the first 350 micron polarization measurement for the disk of the T Tauri star (TTS) DG Tau. The data were obtained using the SHARP polarimeter at the Caltech Submillimeter Observatory. We did not detect polarization but we provide constraints on the normalized Stokes parameters q and u. We derive information about the polarization spectrum by comparing our 350 micron result with an 850 micron polarization detection previously published for this source. This empirical information concerning the polarization spectrum disagrees with the predictions of a recent model for TTS disk polar"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.1255","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":""},"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":"2026-05-18T04:29:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1ZA7KtZGmvzLxkDP5y8OEO4fweBtZYr39dpez17P/fayR7ij8r53gCe8Xvfv4znSwrmHQYvzKgkHuJ6MFQTaBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T21:05:26.659590Z"},"content_sha256":"f5cf98c629c09048a201e55b34771986ef323b45a147727858ee79a704386203","schema_version":"1.0","event_id":"sha256:f5cf98c629c09048a201e55b34771986ef323b45a147727858ee79a704386203"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XGEHI5ZCKTJBKIUFVZKZYJ4NZB/bundle.json","state_url":"https://pith.science/pith/XGEHI5ZCKTJBKIUFVZKZYJ4NZB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XGEHI5ZCKTJBKIUFVZKZYJ4NZB/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":"2026-06-27T21:05:26Z","links":{"resolver":"https://pith.science/pith/XGEHI5ZCKTJBKIUFVZKZYJ4NZB","bundle":"https://pith.science/pith/XGEHI5ZCKTJBKIUFVZKZYJ4NZB/bundle.json","state":"https://pith.science/pith/XGEHI5ZCKTJBKIUFVZKZYJ4NZB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XGEHI5ZCKTJBKIUFVZKZYJ4NZB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:XGEHI5ZCKTJBKIUFVZKZYJ4NZB","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":"e7aacc43ce620a6e1cf6c7398a9987b6c14a0be4141d00c10577068273c591ad","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-03-06T17:00:48Z","title_canon_sha256":"b2ee142e32a0bf5a801d3bc2a89991f7a6d405a3bc42c561a471c53f1cd260bc"},"schema_version":"1.0","source":{"id":"0903.1255","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.1255","created_at":"2026-05-18T04:29:16Z"},{"alias_kind":"arxiv_version","alias_value":"0903.1255v1","created_at":"2026-05-18T04:29:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.1255","created_at":"2026-05-18T04:29:16Z"},{"alias_kind":"pith_short_12","alias_value":"XGEHI5ZCKTJB","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"XGEHI5ZCKTJBKIUF","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"XGEHI5ZC","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:f5cf98c629c09048a201e55b34771986ef323b45a147727858ee79a704386203","target":"graph","created_at":"2026-05-18T04:29:16Z","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 present the first 350 micron polarization measurement for the disk of the T Tauri star (TTS) DG Tau. The data were obtained using the SHARP polarimeter at the Caltech Submillimeter Observatory. We did not detect polarization but we provide constraints on the normalized Stokes parameters q and u. We derive information about the polarization spectrum by comparing our 350 micron result with an 850 micron polarization detection previously published for this source. This empirical information concerning the polarization spectrum disagrees with the predictions of a recent model for TTS disk polar","authors_text":"G. Novak, H. Li, H. Shinnaga, J. Cho, J.E. Vaillancourt, M. Krejny, T. Matthews","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-03-06T17:00:48Z","title":"Polarimetry of DG Tau at 350 microns"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.1255","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":"sha256:62d86c766c2b837191c738cb046c0c39087792ab3af53f9b115d5fab0c4db91b","target":"record","created_at":"2026-05-18T04:29:16Z","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":"e7aacc43ce620a6e1cf6c7398a9987b6c14a0be4141d00c10577068273c591ad","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-03-06T17:00:48Z","title_canon_sha256":"b2ee142e32a0bf5a801d3bc2a89991f7a6d405a3bc42c561a471c53f1cd260bc"},"schema_version":"1.0","source":{"id":"0903.1255","kind":"arxiv","version":1}},"canonical_sha256":"b98874772254d2152285ae559c278dc87595e1ebf4718665000e65ea767c5ac6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b98874772254d2152285ae559c278dc87595e1ebf4718665000e65ea767c5ac6","first_computed_at":"2026-05-18T04:29:16.108805Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:16.108805Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"T5NqIPWjAnM5zxHgLduTBGknwicgYH6fRgFCIMjIeuoYrmrsm8yd8xbWidXdAFKShQQd0ER5HHA2V04fS4CzBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:16.109279Z","signed_message":"canonical_sha256_bytes"},"source_id":"0903.1255","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:62d86c766c2b837191c738cb046c0c39087792ab3af53f9b115d5fab0c4db91b","sha256:f5cf98c629c09048a201e55b34771986ef323b45a147727858ee79a704386203"],"state_sha256":"33aef34a7abeb95e115850f8a27757fb8be3b693e915d72c0ea3927796b9e0ac"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/BJnXac1LiK6w0OPCMsSsAru4b+5l5UjMPNW2tLug//mPEw98DU4vpVWE9Oyopmn1Rq+xNlZBnZ+HIRH4VqLAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T21:05:26.661714Z","bundle_sha256":"7d3dc4a2fc073b2205c264237b7be5f061df99a20a128d75dfbbdfbc5ee26472"}}