{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:VKMRERR4NEYGGGSQNUMBOOUMD6","short_pith_number":"pith:VKMRERR4","canonical_record":{"source":{"id":"1001.0750","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-01-05T19:34:32Z","cross_cats_sorted":[],"title_canon_sha256":"b9c27bfa80c607db2d122378deec506d0884a6f29ab8ea7991c773b0a3f9d834","abstract_canon_sha256":"542c1576e1ad8d99b7e43c6e244ec22fe103b5e40a931503f079f01dc3895f86"},"schema_version":"1.0"},"canonical_sha256":"aa9912463c6930631a506d18173a8c1fa8850d5234f5e584d74246088ba1dfda","source":{"kind":"arxiv","id":"1001.0750","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1001.0750","created_at":"2026-05-18T02:10:04Z"},{"alias_kind":"arxiv_version","alias_value":"1001.0750v1","created_at":"2026-05-18T02:10:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1001.0750","created_at":"2026-05-18T02:10:04Z"},{"alias_kind":"pith_short_12","alias_value":"VKMRERR4NEYG","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"VKMRERR4NEYGGGSQ","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"VKMRERR4","created_at":"2026-05-18T12:26:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:VKMRERR4NEYGGGSQNUMBOOUMD6","target":"record","payload":{"canonical_record":{"source":{"id":"1001.0750","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-01-05T19:34:32Z","cross_cats_sorted":[],"title_canon_sha256":"b9c27bfa80c607db2d122378deec506d0884a6f29ab8ea7991c773b0a3f9d834","abstract_canon_sha256":"542c1576e1ad8d99b7e43c6e244ec22fe103b5e40a931503f079f01dc3895f86"},"schema_version":"1.0"},"canonical_sha256":"aa9912463c6930631a506d18173a8c1fa8850d5234f5e584d74246088ba1dfda","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:10:04.790122Z","signature_b64":"FIDpYoXKzwRaj8eARuSc3jSFAToc1ubAdd8Q3q+o1cdKVmgjODzdGXO52C97qTYvhSIS00CQaE5CFVkoyfY4AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aa9912463c6930631a506d18173a8c1fa8850d5234f5e584d74246088ba1dfda","last_reissued_at":"2026-05-18T02:10:04.789256Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:10:04.789256Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1001.0750","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":"2026-05-18T02:10:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UtW0hl9m1uuDFrMrLHc4OGWEwluz5cUXP5fV+tqVw/CsM2XJYV6dFzc1OZUlyGgIBZ2zD8YS2+MU2AFsaiFfBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T08:29:05.578548Z"},"content_sha256":"b09a6cee15cb45a3f057c43b416f4951ca6d3d5f5730cba7ed0ea3299bcda71f","schema_version":"1.0","event_id":"sha256:b09a6cee15cb45a3f057c43b416f4951ca6d3d5f5730cba7ed0ea3299bcda71f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:VKMRERR4NEYGGGSQNUMBOOUMD6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Deep Chandra X-ray Spectrum of the Accreting Young Star TW Hydrae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. K. Dupree (CfA), G. J. M. Luna (CfA), N. S. Brickhouse (CfA), S. R. Cranmer (CfA), S. Wolk (CfA)","submitted_at":"2010-01-05T19:34:32Z","abstract_excerpt":"We present X-ray spectral analysis of the accreting young star TW Hydrae from a 489 ks observation using the Chandra High Energy Transmission Grating. The spectrum provides a rich set of diagnostics for electron temperature T_e, electron density N_e, hydrogen column density N_H, relative elemental abundances and velocities and reveals its source in 3 distinct regions of the stellar atmosphere: the stellar corona, the accretion shock, and a very large extended volume of warm postshock plasma. The presence of Mg XII, Si XIII, and Si XIV emission lines in the spectrum requires coronal structures "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1001.0750","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":"2026-05-18T02:10:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VgB9ZPqvZE0rseyM7Wey9MzDYJw91urn1YdKXoavq03CcvZCMUupn5nRhobptZIahREHAVq9VIeq+JteSiagDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T08:29:05.578896Z"},"content_sha256":"7147c594effaf00b7b5c13252d94d7d24fdf104b25c6b3a1412f17e8add7e72c","schema_version":"1.0","event_id":"sha256:7147c594effaf00b7b5c13252d94d7d24fdf104b25c6b3a1412f17e8add7e72c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VKMRERR4NEYGGGSQNUMBOOUMD6/bundle.json","state_url":"https://pith.science/pith/VKMRERR4NEYGGGSQNUMBOOUMD6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VKMRERR4NEYGGGSQNUMBOOUMD6/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":"2026-06-05T08:29:05Z","links":{"resolver":"https://pith.science/pith/VKMRERR4NEYGGGSQNUMBOOUMD6","bundle":"https://pith.science/pith/VKMRERR4NEYGGGSQNUMBOOUMD6/bundle.json","state":"https://pith.science/pith/VKMRERR4NEYGGGSQNUMBOOUMD6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VKMRERR4NEYGGGSQNUMBOOUMD6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:VKMRERR4NEYGGGSQNUMBOOUMD6","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":"542c1576e1ad8d99b7e43c6e244ec22fe103b5e40a931503f079f01dc3895f86","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-01-05T19:34:32Z","title_canon_sha256":"b9c27bfa80c607db2d122378deec506d0884a6f29ab8ea7991c773b0a3f9d834"},"schema_version":"1.0","source":{"id":"1001.0750","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1001.0750","created_at":"2026-05-18T02:10:04Z"},{"alias_kind":"arxiv_version","alias_value":"1001.0750v1","created_at":"2026-05-18T02:10:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1001.0750","created_at":"2026-05-18T02:10:04Z"},{"alias_kind":"pith_short_12","alias_value":"VKMRERR4NEYG","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"VKMRERR4NEYGGGSQ","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"VKMRERR4","created_at":"2026-05-18T12:26:15Z"}],"graph_snapshots":[{"event_id":"sha256:7147c594effaf00b7b5c13252d94d7d24fdf104b25c6b3a1412f17e8add7e72c","target":"graph","created_at":"2026-05-18T02:10:04Z","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 X-ray spectral analysis of the accreting young star TW Hydrae from a 489 ks observation using the Chandra High Energy Transmission Grating. The spectrum provides a rich set of diagnostics for electron temperature T_e, electron density N_e, hydrogen column density N_H, relative elemental abundances and velocities and reveals its source in 3 distinct regions of the stellar atmosphere: the stellar corona, the accretion shock, and a very large extended volume of warm postshock plasma. The presence of Mg XII, Si XIII, and Si XIV emission lines in the spectrum requires coronal structures ","authors_text":"A. K. Dupree (CfA), G. J. M. Luna (CfA), N. S. Brickhouse (CfA), S. R. Cranmer (CfA), S. Wolk (CfA)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-01-05T19:34:32Z","title":"A Deep Chandra X-ray Spectrum of the Accreting Young Star TW Hydrae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1001.0750","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:b09a6cee15cb45a3f057c43b416f4951ca6d3d5f5730cba7ed0ea3299bcda71f","target":"record","created_at":"2026-05-18T02:10:04Z","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":"542c1576e1ad8d99b7e43c6e244ec22fe103b5e40a931503f079f01dc3895f86","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-01-05T19:34:32Z","title_canon_sha256":"b9c27bfa80c607db2d122378deec506d0884a6f29ab8ea7991c773b0a3f9d834"},"schema_version":"1.0","source":{"id":"1001.0750","kind":"arxiv","version":1}},"canonical_sha256":"aa9912463c6930631a506d18173a8c1fa8850d5234f5e584d74246088ba1dfda","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aa9912463c6930631a506d18173a8c1fa8850d5234f5e584d74246088ba1dfda","first_computed_at":"2026-05-18T02:10:04.789256Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:10:04.789256Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FIDpYoXKzwRaj8eARuSc3jSFAToc1ubAdd8Q3q+o1cdKVmgjODzdGXO52C97qTYvhSIS00CQaE5CFVkoyfY4AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:10:04.790122Z","signed_message":"canonical_sha256_bytes"},"source_id":"1001.0750","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b09a6cee15cb45a3f057c43b416f4951ca6d3d5f5730cba7ed0ea3299bcda71f","sha256:7147c594effaf00b7b5c13252d94d7d24fdf104b25c6b3a1412f17e8add7e72c"],"state_sha256":"8ef88a0693dd740094db407c613b01dc7a43b813c7ab011b0aa82d661131f5e8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"l7nt0WHFzRmpM62DZspaR2Y6l57fdnwcNjDU8bpEHf7gxb4ZD1TvnfXAQEXTDTY07EA+BPzqkOZ+MUeuNYQXBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T08:29:05.580893Z","bundle_sha256":"f32cc613128450f12c9a2aa7282fb8a3088fb3ae05ba133111c30f0e93aed036"}}