{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:P55EP2QIL5POCHIOHKIBXWYVM3","short_pith_number":"pith:P55EP2QI","canonical_record":{"source":{"id":"1204.3704","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-04-17T05:39:11Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"c220ed2ffb842f788d8d321de19bebd59c42d94a3d5ec240e285ee532edd3e49","abstract_canon_sha256":"d57d0d442040f664506ad5d9942ec98d522f1f392fb4e52280ad6c3d06153f45"},"schema_version":"1.0"},"canonical_sha256":"7f7a47ea085f5ee11d0e3a901bdb1566cd24447a15ba93ed0c472d723f00b735","source":{"kind":"arxiv","id":"1204.3704","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.3704","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"arxiv_version","alias_value":"1204.3704v1","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.3704","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"pith_short_12","alias_value":"P55EP2QIL5PO","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"P55EP2QIL5POCHIO","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"P55EP2QI","created_at":"2026-05-18T12:27:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:P55EP2QIL5POCHIOHKIBXWYVM3","target":"record","payload":{"canonical_record":{"source":{"id":"1204.3704","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-04-17T05:39:11Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"c220ed2ffb842f788d8d321de19bebd59c42d94a3d5ec240e285ee532edd3e49","abstract_canon_sha256":"d57d0d442040f664506ad5d9942ec98d522f1f392fb4e52280ad6c3d06153f45"},"schema_version":"1.0"},"canonical_sha256":"7f7a47ea085f5ee11d0e3a901bdb1566cd24447a15ba93ed0c472d723f00b735","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:57:51.669302Z","signature_b64":"Y9Y5S/gdgKD7FQBcnHEVTj0jSztWFUuVYvjoX+XY5Kvr2vq+RFOFaSHFKymmne0mRjJvyu7Vf3tHYYfgzlMPAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7f7a47ea085f5ee11d0e3a901bdb1566cd24447a15ba93ed0c472d723f00b735","last_reissued_at":"2026-05-18T01:57:51.668841Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:57:51.668841Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1204.3704","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":"2026-05-18T01:57:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LTjST+g3Eze2LGQ6m35sKq/8pK3D01FxK7givp7lr1PjyPAyOZMZTcZK8dIaraZxHbsdi/p4SQuKPExVLoi0CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T03:12:47.580790Z"},"content_sha256":"75cece6cae5057e103626bdc486be1c99f6627a599e1b52bb453fc52fd6f537e","schema_version":"1.0","event_id":"sha256:75cece6cae5057e103626bdc486be1c99f6627a599e1b52bb453fc52fd6f537e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:P55EP2QIL5POCHIOHKIBXWYVM3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Low-mass Stellar Population in L1641: Evidence for Environmental Dependence of the Stellar Initial Mass Function","license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Catherine Espaillat, Gregory Mosby, Jesus Hernandez, John J. Tobin, Lee Hartmann, Lori Allen, S. T. Megeath, Wen-hsin Hsu","submitted_at":"2012-04-17T05:39:11Z","abstract_excerpt":"We present results from an optical photometric and spectroscopic survey of the young stellar population in L1641, the low-density star-forming region of the Orion A cloud south of the Orion Nebula Cluster (ONC). Our goal is to determine whether L1641 has a large enough low-mass population to make the known lack of high-mass stars a statistically-significant demonstration of environmental dependence of the upper mass stellar initial mass function (IMF). Our spectroscopic sample consists of IR-excess objects selected from the Spitzer/IRAC survey and non-excess objects selected from optical photo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.3704","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":"2026-05-18T01:57:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GEuZfqZvPyMcC3qqM8Z7dJd09uw1+bDkz1+Lco2g6t98o1wy4E9bs/uTMGDMkQXBv3+qK9Urgw4ZgfJLsxVVDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T03:12:47.581143Z"},"content_sha256":"061b886a186e7878615ea8afd693ed182900a4594a09190f39de16c68d659b36","schema_version":"1.0","event_id":"sha256:061b886a186e7878615ea8afd693ed182900a4594a09190f39de16c68d659b36"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/P55EP2QIL5POCHIOHKIBXWYVM3/bundle.json","state_url":"https://pith.science/pith/P55EP2QIL5POCHIOHKIBXWYVM3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/P55EP2QIL5POCHIOHKIBXWYVM3/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":"2026-05-31T03:12:47Z","links":{"resolver":"https://pith.science/pith/P55EP2QIL5POCHIOHKIBXWYVM3","bundle":"https://pith.science/pith/P55EP2QIL5POCHIOHKIBXWYVM3/bundle.json","state":"https://pith.science/pith/P55EP2QIL5POCHIOHKIBXWYVM3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/P55EP2QIL5POCHIOHKIBXWYVM3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:P55EP2QIL5POCHIOHKIBXWYVM3","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":"d57d0d442040f664506ad5d9942ec98d522f1f392fb4e52280ad6c3d06153f45","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-04-17T05:39:11Z","title_canon_sha256":"c220ed2ffb842f788d8d321de19bebd59c42d94a3d5ec240e285ee532edd3e49"},"schema_version":"1.0","source":{"id":"1204.3704","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.3704","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"arxiv_version","alias_value":"1204.3704v1","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.3704","created_at":"2026-05-18T01:57:51Z"},{"alias_kind":"pith_short_12","alias_value":"P55EP2QIL5PO","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"P55EP2QIL5POCHIO","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"P55EP2QI","created_at":"2026-05-18T12:27:18Z"}],"graph_snapshots":[{"event_id":"sha256:061b886a186e7878615ea8afd693ed182900a4594a09190f39de16c68d659b36","target":"graph","created_at":"2026-05-18T01:57:51Z","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 results from an optical photometric and spectroscopic survey of the young stellar population in L1641, the low-density star-forming region of the Orion A cloud south of the Orion Nebula Cluster (ONC). Our goal is to determine whether L1641 has a large enough low-mass population to make the known lack of high-mass stars a statistically-significant demonstration of environmental dependence of the upper mass stellar initial mass function (IMF). Our spectroscopic sample consists of IR-excess objects selected from the Spitzer/IRAC survey and non-excess objects selected from optical photo","authors_text":"Catherine Espaillat, Gregory Mosby, Jesus Hernandez, John J. Tobin, Lee Hartmann, Lori Allen, S. T. Megeath, Wen-hsin Hsu","cross_cats":["astro-ph.GA"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-04-17T05:39:11Z","title":"The Low-mass Stellar Population in L1641: Evidence for Environmental Dependence of the Stellar Initial Mass Function"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.3704","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":"sha256:75cece6cae5057e103626bdc486be1c99f6627a599e1b52bb453fc52fd6f537e","target":"record","created_at":"2026-05-18T01:57:51Z","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":"d57d0d442040f664506ad5d9942ec98d522f1f392fb4e52280ad6c3d06153f45","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-04-17T05:39:11Z","title_canon_sha256":"c220ed2ffb842f788d8d321de19bebd59c42d94a3d5ec240e285ee532edd3e49"},"schema_version":"1.0","source":{"id":"1204.3704","kind":"arxiv","version":1}},"canonical_sha256":"7f7a47ea085f5ee11d0e3a901bdb1566cd24447a15ba93ed0c472d723f00b735","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7f7a47ea085f5ee11d0e3a901bdb1566cd24447a15ba93ed0c472d723f00b735","first_computed_at":"2026-05-18T01:57:51.668841Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:57:51.668841Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Y9Y5S/gdgKD7FQBcnHEVTj0jSztWFUuVYvjoX+XY5Kvr2vq+RFOFaSHFKymmne0mRjJvyu7Vf3tHYYfgzlMPAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:57:51.669302Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.3704","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:75cece6cae5057e103626bdc486be1c99f6627a599e1b52bb453fc52fd6f537e","sha256:061b886a186e7878615ea8afd693ed182900a4594a09190f39de16c68d659b36"],"state_sha256":"6b39c6100ee4dc783279dfea8b7e57a144f0503659261dc4095fb954f6a36cf5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z2FO1qPIWor2HzFau5NDA9RH/Oiak2TD/J8eLOouSkHwu94XxZuKmHajaaGQh2X9JBZw02WZ0Q0nI1BewqytBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T03:12:47.583193Z","bundle_sha256":"3fba58fc6ce55d251924b6ffc26c402a9db53ea31524bef5d3c1bf4db4c074a8"}}