{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:XYRGOIGL7PCOB4YGP2JGQ5TAPR","short_pith_number":"pith:XYRGOIGL","canonical_record":{"source":{"id":"0904.0819","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-04-05T21:19:22Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"b3d1f4b132499fb8b3f000fd52f656dbaa83d5d159f71ee22c7b663a3eaaca33","abstract_canon_sha256":"bc35c6e62aac20a9d45d868404657e0be71e8713a2568792a2b2ea6e845b94a8"},"schema_version":"1.0"},"canonical_sha256":"be226720cbfbc4e0f3067e926876607c6ac4f7ba8760c7cf3afd6d97e6a3aee8","source":{"kind":"arxiv","id":"0904.0819","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.0819","created_at":"2026-05-18T04:29:43Z"},{"alias_kind":"arxiv_version","alias_value":"0904.0819v1","created_at":"2026-05-18T04:29:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.0819","created_at":"2026-05-18T04:29:43Z"},{"alias_kind":"pith_short_12","alias_value":"XYRGOIGL7PCO","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"XYRGOIGL7PCOB4YG","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"XYRGOIGL","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:XYRGOIGL7PCOB4YGP2JGQ5TAPR","target":"record","payload":{"canonical_record":{"source":{"id":"0904.0819","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-04-05T21:19:22Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"b3d1f4b132499fb8b3f000fd52f656dbaa83d5d159f71ee22c7b663a3eaaca33","abstract_canon_sha256":"bc35c6e62aac20a9d45d868404657e0be71e8713a2568792a2b2ea6e845b94a8"},"schema_version":"1.0"},"canonical_sha256":"be226720cbfbc4e0f3067e926876607c6ac4f7ba8760c7cf3afd6d97e6a3aee8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:43.770843Z","signature_b64":"7sR+AF/HpbCQFuWaS5ViIPsvBAL6e3Iv7CLyjR8UYFkgZe0KJi0JFIyyLGLDMx4+YY4NuZEXlA+8dBGNHjkMAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"be226720cbfbc4e0f3067e926876607c6ac4f7ba8760c7cf3afd6d97e6a3aee8","last_reissued_at":"2026-05-18T04:29:43.770261Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:43.770261Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0904.0819","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":"2026-05-18T04:29:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DAVKGM9O9zrGf90WaMlnf9Xo+tZOcqLk4lEvatmzMV7F0N2mK+yikfZP/4+9ektIoKZr4V6d4MNfetdsvPpABg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:05:26.002767Z"},"content_sha256":"c67944d154c91e9f41071eb4400969614dd3d268445acf3d0a2b4a90067350a8","schema_version":"1.0","event_id":"sha256:c67944d154c91e9f41071eb4400969614dd3d268445acf3d0a2b4a90067350a8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:XYRGOIGL7PCOB4YGP2JGQ5TAPR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"New Debris Disks Around Young, Low Mass Stars Discovered With The Spitzer Space Telescope","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.SR","authors_text":"C. H. Chen, I. Song, J. R. Stauffer, K. R. Stapelfeldt, K. Y. L. Su, M. W. Werner, Peter Plavchan","submitted_at":"2009-04-05T21:19:22Z","abstract_excerpt":"(abridged) We present 24 and 70 micron MIPS observations of 70 A through M-type dwarfs with estimated ages from 8 Myr to 1.1 Gyr, as part of a Spitzer guaranteed time program. Our sample is selected from stars with common youth indicators such as lithium abundance, X-ray activity, chromospheric activity, and rapid rotation. We compare our MIPS observations to empirically derived K-[24] colors as a function of the stellar effective temperature to identify 24 and 70 micron excesses.\n  We confirm the previously published 70 micron excesses for HD 92945, HD 112429, and AU Mic. We present the disco"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.0819","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":"2026-05-18T04:29:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"acVx2D1xxpahc2rvgo/qQ613ebsb+/gmJcGA60JjZz3uB7nEaRSM/5cNYy++bHgfTZSRHenifwB4x+/zqHx1DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:05:26.003488Z"},"content_sha256":"3389382e9a6e6867a54f25cf335e4d15a63cb1f92770af87bf4ca8ba128a50b3","schema_version":"1.0","event_id":"sha256:3389382e9a6e6867a54f25cf335e4d15a63cb1f92770af87bf4ca8ba128a50b3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XYRGOIGL7PCOB4YGP2JGQ5TAPR/bundle.json","state_url":"https://pith.science/pith/XYRGOIGL7PCOB4YGP2JGQ5TAPR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XYRGOIGL7PCOB4YGP2JGQ5TAPR/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":"2026-05-25T16:05:26Z","links":{"resolver":"https://pith.science/pith/XYRGOIGL7PCOB4YGP2JGQ5TAPR","bundle":"https://pith.science/pith/XYRGOIGL7PCOB4YGP2JGQ5TAPR/bundle.json","state":"https://pith.science/pith/XYRGOIGL7PCOB4YGP2JGQ5TAPR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XYRGOIGL7PCOB4YGP2JGQ5TAPR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:XYRGOIGL7PCOB4YGP2JGQ5TAPR","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":"bc35c6e62aac20a9d45d868404657e0be71e8713a2568792a2b2ea6e845b94a8","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-04-05T21:19:22Z","title_canon_sha256":"b3d1f4b132499fb8b3f000fd52f656dbaa83d5d159f71ee22c7b663a3eaaca33"},"schema_version":"1.0","source":{"id":"0904.0819","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.0819","created_at":"2026-05-18T04:29:43Z"},{"alias_kind":"arxiv_version","alias_value":"0904.0819v1","created_at":"2026-05-18T04:29:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.0819","created_at":"2026-05-18T04:29:43Z"},{"alias_kind":"pith_short_12","alias_value":"XYRGOIGL7PCO","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"XYRGOIGL7PCOB4YG","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"XYRGOIGL","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:3389382e9a6e6867a54f25cf335e4d15a63cb1f92770af87bf4ca8ba128a50b3","target":"graph","created_at":"2026-05-18T04:29:43Z","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":"(abridged) We present 24 and 70 micron MIPS observations of 70 A through M-type dwarfs with estimated ages from 8 Myr to 1.1 Gyr, as part of a Spitzer guaranteed time program. Our sample is selected from stars with common youth indicators such as lithium abundance, X-ray activity, chromospheric activity, and rapid rotation. We compare our MIPS observations to empirically derived K-[24] colors as a function of the stellar effective temperature to identify 24 and 70 micron excesses.\n  We confirm the previously published 70 micron excesses for HD 92945, HD 112429, and AU Mic. We present the disco","authors_text":"C. H. Chen, I. Song, J. R. Stauffer, K. R. Stapelfeldt, K. Y. L. Su, M. W. Werner, Peter Plavchan","cross_cats":["astro-ph.EP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-04-05T21:19:22Z","title":"New Debris Disks Around Young, Low Mass Stars Discovered With The Spitzer Space Telescope"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.0819","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:c67944d154c91e9f41071eb4400969614dd3d268445acf3d0a2b4a90067350a8","target":"record","created_at":"2026-05-18T04:29:43Z","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":"bc35c6e62aac20a9d45d868404657e0be71e8713a2568792a2b2ea6e845b94a8","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-04-05T21:19:22Z","title_canon_sha256":"b3d1f4b132499fb8b3f000fd52f656dbaa83d5d159f71ee22c7b663a3eaaca33"},"schema_version":"1.0","source":{"id":"0904.0819","kind":"arxiv","version":1}},"canonical_sha256":"be226720cbfbc4e0f3067e926876607c6ac4f7ba8760c7cf3afd6d97e6a3aee8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"be226720cbfbc4e0f3067e926876607c6ac4f7ba8760c7cf3afd6d97e6a3aee8","first_computed_at":"2026-05-18T04:29:43.770261Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:43.770261Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7sR+AF/HpbCQFuWaS5ViIPsvBAL6e3Iv7CLyjR8UYFkgZe0KJi0JFIyyLGLDMx4+YY4NuZEXlA+8dBGNHjkMAA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:43.770843Z","signed_message":"canonical_sha256_bytes"},"source_id":"0904.0819","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c67944d154c91e9f41071eb4400969614dd3d268445acf3d0a2b4a90067350a8","sha256:3389382e9a6e6867a54f25cf335e4d15a63cb1f92770af87bf4ca8ba128a50b3"],"state_sha256":"5fc2c2a8d67cedcf75cc82d412b6adf7d44445761adea1c3c4abc13194288dbb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vp2AwUKiVwCzFO6IjYT8D5Gx4pD0bD1zro07eqFlS1Yu0fiEsL51koFv7rGgd9+q9myQnCnNWRatBY2Qd+P4BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T16:05:26.007241Z","bundle_sha256":"a762437a2de08e40e71fa9c80124b6826c783342e58779b4be6be1b6034e7699"}}