{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:TFWK7SZ5XSWEKLJIRMC4LV6VCC","short_pith_number":"pith:TFWK7SZ5","canonical_record":{"source":{"id":"1005.4459","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-25T00:10:32Z","cross_cats_sorted":[],"title_canon_sha256":"9379186561aece55f01f71d821925bce18c7f5c7ee60a9642bb0bf5be3c8fcf5","abstract_canon_sha256":"d3afe71d2e15fc375b2a9139d751d56e6e3b4c63f3ffd5b1fa04be94fcc30c2c"},"schema_version":"1.0"},"canonical_sha256":"996cafcb3dbcac452d288b05c5d7d510a010dc0ed38da9b724720b635b384201","source":{"kind":"arxiv","id":"1005.4459","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1005.4459","created_at":"2026-05-18T04:36:59Z"},{"alias_kind":"arxiv_version","alias_value":"1005.4459v1","created_at":"2026-05-18T04:36:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1005.4459","created_at":"2026-05-18T04:36:59Z"},{"alias_kind":"pith_short_12","alias_value":"TFWK7SZ5XSWE","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_16","alias_value":"TFWK7SZ5XSWEKLJI","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_8","alias_value":"TFWK7SZ5","created_at":"2026-05-18T12:26:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:TFWK7SZ5XSWEKLJIRMC4LV6VCC","target":"record","payload":{"canonical_record":{"source":{"id":"1005.4459","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-25T00:10:32Z","cross_cats_sorted":[],"title_canon_sha256":"9379186561aece55f01f71d821925bce18c7f5c7ee60a9642bb0bf5be3c8fcf5","abstract_canon_sha256":"d3afe71d2e15fc375b2a9139d751d56e6e3b4c63f3ffd5b1fa04be94fcc30c2c"},"schema_version":"1.0"},"canonical_sha256":"996cafcb3dbcac452d288b05c5d7d510a010dc0ed38da9b724720b635b384201","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:36:59.253533Z","signature_b64":"i5/7lIipa5Jw8T/m/AHa3pbcPaf2zmBd2c46C4GWlTFpgW5PbPZ4q5lrxEZkJqrOMzolqTACkvQOmYVTSsuPAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"996cafcb3dbcac452d288b05c5d7d510a010dc0ed38da9b724720b635b384201","last_reissued_at":"2026-05-18T04:36:59.252819Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:36:59.252819Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1005.4459","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":"2026-05-18T04:36:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1a7HLZaW8E5Rka5XD8+ITi1I6uMcUgugH9Jsb4bcbw4gimcIAGyyNMBTNFIl6pd3qdTvuw2vdy8/9Of44V+YBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T04:30:38.445425Z"},"content_sha256":"817efccb8d1a60c0e20416d26e1389ddaaca21ae2cf6058b2275ed0105de63bd","schema_version":"1.0","event_id":"sha256:817efccb8d1a60c0e20416d26e1389ddaaca21ae2cf6058b2275ed0105de63bd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:TFWK7SZ5XSWEKLJIRMC4LV6VCC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The disk-bearing young star IM Lup","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"D. M. Burton, H. M. Guenther, J. H. M. M. Schmitt, M. Guedel, S. P. Matt, Z.-Y. Li","submitted_at":"2010-05-25T00:10:32Z","abstract_excerpt":"Classical T Tauri stars (CTTS) differ in their X-ray signatures from older pre-main sequence stars, e.g. weak-lined TTS (WTTS). CTTS show a soft excess and deviations from the low-density coronal limit in the He-like triplets. We test whether these features correlate with accretion or the presence of a disk by observing IM Lup, a disk-bearing object apparently in transition between CTTS and WTTS without obvious accretion. We analyse a Chandra grating spectrum and additional XMM-Newton data of IM Lup and accompanying optical spectra, some of them taken simultaneously to the X-ray observations. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1005.4459","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":"2026-05-18T04:36:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"P+MfKqMpcQzieyuXkzLgTv9x7VWS8mjJ8E4Rmuq5a4aefernvx74e5OeJsLhq1At+Ki6DHV54OThq1oeTDqIBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T04:30:38.445773Z"},"content_sha256":"7fd9f7c7bbc1334c293cd6bb088cfc4126cb254236319a5d99866e2e29b30f00","schema_version":"1.0","event_id":"sha256:7fd9f7c7bbc1334c293cd6bb088cfc4126cb254236319a5d99866e2e29b30f00"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TFWK7SZ5XSWEKLJIRMC4LV6VCC/bundle.json","state_url":"https://pith.science/pith/TFWK7SZ5XSWEKLJIRMC4LV6VCC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TFWK7SZ5XSWEKLJIRMC4LV6VCC/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":"2026-06-04T04:30:38Z","links":{"resolver":"https://pith.science/pith/TFWK7SZ5XSWEKLJIRMC4LV6VCC","bundle":"https://pith.science/pith/TFWK7SZ5XSWEKLJIRMC4LV6VCC/bundle.json","state":"https://pith.science/pith/TFWK7SZ5XSWEKLJIRMC4LV6VCC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TFWK7SZ5XSWEKLJIRMC4LV6VCC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:TFWK7SZ5XSWEKLJIRMC4LV6VCC","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":"d3afe71d2e15fc375b2a9139d751d56e6e3b4c63f3ffd5b1fa04be94fcc30c2c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-25T00:10:32Z","title_canon_sha256":"9379186561aece55f01f71d821925bce18c7f5c7ee60a9642bb0bf5be3c8fcf5"},"schema_version":"1.0","source":{"id":"1005.4459","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1005.4459","created_at":"2026-05-18T04:36:59Z"},{"alias_kind":"arxiv_version","alias_value":"1005.4459v1","created_at":"2026-05-18T04:36:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1005.4459","created_at":"2026-05-18T04:36:59Z"},{"alias_kind":"pith_short_12","alias_value":"TFWK7SZ5XSWE","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_16","alias_value":"TFWK7SZ5XSWEKLJI","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_8","alias_value":"TFWK7SZ5","created_at":"2026-05-18T12:26:13Z"}],"graph_snapshots":[{"event_id":"sha256:7fd9f7c7bbc1334c293cd6bb088cfc4126cb254236319a5d99866e2e29b30f00","target":"graph","created_at":"2026-05-18T04:36:59Z","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":"Classical T Tauri stars (CTTS) differ in their X-ray signatures from older pre-main sequence stars, e.g. weak-lined TTS (WTTS). CTTS show a soft excess and deviations from the low-density coronal limit in the He-like triplets. We test whether these features correlate with accretion or the presence of a disk by observing IM Lup, a disk-bearing object apparently in transition between CTTS and WTTS without obvious accretion. We analyse a Chandra grating spectrum and additional XMM-Newton data of IM Lup and accompanying optical spectra, some of them taken simultaneously to the X-ray observations. ","authors_text":"D. M. Burton, H. M. Guenther, J. H. M. M. Schmitt, M. Guedel, S. P. Matt, Z.-Y. Li","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-25T00:10:32Z","title":"The disk-bearing young star IM Lup"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1005.4459","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":"sha256:817efccb8d1a60c0e20416d26e1389ddaaca21ae2cf6058b2275ed0105de63bd","target":"record","created_at":"2026-05-18T04:36:59Z","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":"d3afe71d2e15fc375b2a9139d751d56e6e3b4c63f3ffd5b1fa04be94fcc30c2c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-05-25T00:10:32Z","title_canon_sha256":"9379186561aece55f01f71d821925bce18c7f5c7ee60a9642bb0bf5be3c8fcf5"},"schema_version":"1.0","source":{"id":"1005.4459","kind":"arxiv","version":1}},"canonical_sha256":"996cafcb3dbcac452d288b05c5d7d510a010dc0ed38da9b724720b635b384201","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"996cafcb3dbcac452d288b05c5d7d510a010dc0ed38da9b724720b635b384201","first_computed_at":"2026-05-18T04:36:59.252819Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:36:59.252819Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"i5/7lIipa5Jw8T/m/AHa3pbcPaf2zmBd2c46C4GWlTFpgW5PbPZ4q5lrxEZkJqrOMzolqTACkvQOmYVTSsuPAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:36:59.253533Z","signed_message":"canonical_sha256_bytes"},"source_id":"1005.4459","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:817efccb8d1a60c0e20416d26e1389ddaaca21ae2cf6058b2275ed0105de63bd","sha256:7fd9f7c7bbc1334c293cd6bb088cfc4126cb254236319a5d99866e2e29b30f00"],"state_sha256":"2b9a3eab42243f0ba1d3ce372c5d12cee856a573d976b8877055e8dd7574cc81"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aFfjNlbKZjSNmfuVbf8pWY56ZEnH5hPDTo+yjL0vLiprnZp+QIk5NIdDS7UTWdHq5yKBV5C2O1qYfys/blexBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T04:30:38.447794Z","bundle_sha256":"2eb7c27bcc01418e96c7bbf2324fa35556f1b070e84601360f1297a5133effab"}}