{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:IIWEGL65EGNZWMLJD6Z4K2LWGN","short_pith_number":"pith:IIWEGL65","canonical_record":{"source":{"id":"1107.3515","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-18T17:43:01Z","cross_cats_sorted":[],"title_canon_sha256":"daac1f2c9b53e204015a740872b77a7bfb3fa699f089e40509e7fc20e601ca65","abstract_canon_sha256":"cd7e0e82f20f49bf96331af055db2aa8f6baca3a95ff884ae1956613fc1fd3e2"},"schema_version":"1.0"},"canonical_sha256":"422c432fdd219b9b31691fb3c56976336566470562be98f25234455cf5eca966","source":{"kind":"arxiv","id":"1107.3515","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.3515","created_at":"2026-05-18T02:01:15Z"},{"alias_kind":"arxiv_version","alias_value":"1107.3515v1","created_at":"2026-05-18T02:01:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.3515","created_at":"2026-05-18T02:01:15Z"},{"alias_kind":"pith_short_12","alias_value":"IIWEGL65EGNZ","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_16","alias_value":"IIWEGL65EGNZWMLJ","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_8","alias_value":"IIWEGL65","created_at":"2026-05-18T12:26:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:IIWEGL65EGNZWMLJD6Z4K2LWGN","target":"record","payload":{"canonical_record":{"source":{"id":"1107.3515","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-18T17:43:01Z","cross_cats_sorted":[],"title_canon_sha256":"daac1f2c9b53e204015a740872b77a7bfb3fa699f089e40509e7fc20e601ca65","abstract_canon_sha256":"cd7e0e82f20f49bf96331af055db2aa8f6baca3a95ff884ae1956613fc1fd3e2"},"schema_version":"1.0"},"canonical_sha256":"422c432fdd219b9b31691fb3c56976336566470562be98f25234455cf5eca966","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:15.386788Z","signature_b64":"V5pZiLjLXrofmlP7vUGLvZAjfeJOBfkQnQByTPCUTe8R2ykvnkhBGHqFOtLmsMp/hS4VK9rgOEhX08ZVknytBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"422c432fdd219b9b31691fb3c56976336566470562be98f25234455cf5eca966","last_reissued_at":"2026-05-18T02:01:15.386243Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:15.386243Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1107.3515","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":"2026-05-18T02:01:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WqmUEAiCTjLhs1K3wJikBod7/HDoQAhoDio8jy683n+4MzGUbRy4h+55poyAVsHrCT7MoYw17XQ9VvjGVYgtBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T18:49:17.175706Z"},"content_sha256":"9b3aab927e6556195885552bf97a97bcbdd3eb2d98c8a91041e11264c30b5dd4","schema_version":"1.0","event_id":"sha256:9b3aab927e6556195885552bf97a97bcbdd3eb2d98c8a91041e11264c30b5dd4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:IIWEGL65EGNZWMLJD6Z4K2LWGN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Photoelectric cross-sections of gas and dust in protoplanetary disks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Edwin Bergin, Thomas Bethell","submitted_at":"2011-07-18T17:43:01Z","abstract_excerpt":"We provide simple polynomial fits to the X-ray photoelectric cross-sections (0.03 < E < 10keV) for mixtures of gas and dust found in protoplanetary disks. Using the solar elemental abundances of Asplund et al. (2009) we treat the gas and dust components separately, facilitating the further exploration evolutionary processes such as grain settling and gain growth. We find that blanketing due to advanced grain-growth (a_max > 1 micron) can reduce the X-ray opacity of dust appreciably at E_X ~ 1keV, coincident with the peak of typical T Tauri X-ray spectra. However, the reduction of dust opacity "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.3515","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":"2026-05-18T02:01:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QMTfPcEYugu5UUYGnYr53FRco/1LAXnZCpACb/rtySIIDwgL5x5YM3lrEwjbzyLhfh1opxVGBJPP0Dn6n/uUDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T18:49:17.176336Z"},"content_sha256":"49dac06ffb79f38879a79771f1e8e3098a4beeae921ed92bce5d4ef69466df16","schema_version":"1.0","event_id":"sha256:49dac06ffb79f38879a79771f1e8e3098a4beeae921ed92bce5d4ef69466df16"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IIWEGL65EGNZWMLJD6Z4K2LWGN/bundle.json","state_url":"https://pith.science/pith/IIWEGL65EGNZWMLJD6Z4K2LWGN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IIWEGL65EGNZWMLJD6Z4K2LWGN/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":"2026-06-07T18:49:17Z","links":{"resolver":"https://pith.science/pith/IIWEGL65EGNZWMLJD6Z4K2LWGN","bundle":"https://pith.science/pith/IIWEGL65EGNZWMLJD6Z4K2LWGN/bundle.json","state":"https://pith.science/pith/IIWEGL65EGNZWMLJD6Z4K2LWGN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IIWEGL65EGNZWMLJD6Z4K2LWGN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:IIWEGL65EGNZWMLJD6Z4K2LWGN","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":"cd7e0e82f20f49bf96331af055db2aa8f6baca3a95ff884ae1956613fc1fd3e2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-18T17:43:01Z","title_canon_sha256":"daac1f2c9b53e204015a740872b77a7bfb3fa699f089e40509e7fc20e601ca65"},"schema_version":"1.0","source":{"id":"1107.3515","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.3515","created_at":"2026-05-18T02:01:15Z"},{"alias_kind":"arxiv_version","alias_value":"1107.3515v1","created_at":"2026-05-18T02:01:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.3515","created_at":"2026-05-18T02:01:15Z"},{"alias_kind":"pith_short_12","alias_value":"IIWEGL65EGNZ","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_16","alias_value":"IIWEGL65EGNZWMLJ","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_8","alias_value":"IIWEGL65","created_at":"2026-05-18T12:26:30Z"}],"graph_snapshots":[{"event_id":"sha256:49dac06ffb79f38879a79771f1e8e3098a4beeae921ed92bce5d4ef69466df16","target":"graph","created_at":"2026-05-18T02:01:15Z","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 provide simple polynomial fits to the X-ray photoelectric cross-sections (0.03 < E < 10keV) for mixtures of gas and dust found in protoplanetary disks. Using the solar elemental abundances of Asplund et al. (2009) we treat the gas and dust components separately, facilitating the further exploration evolutionary processes such as grain settling and gain growth. We find that blanketing due to advanced grain-growth (a_max > 1 micron) can reduce the X-ray opacity of dust appreciably at E_X ~ 1keV, coincident with the peak of typical T Tauri X-ray spectra. However, the reduction of dust opacity ","authors_text":"Edwin Bergin, Thomas Bethell","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-18T17:43:01Z","title":"Photoelectric cross-sections of gas and dust in protoplanetary disks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.3515","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":"sha256:9b3aab927e6556195885552bf97a97bcbdd3eb2d98c8a91041e11264c30b5dd4","target":"record","created_at":"2026-05-18T02:01:15Z","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":"cd7e0e82f20f49bf96331af055db2aa8f6baca3a95ff884ae1956613fc1fd3e2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-18T17:43:01Z","title_canon_sha256":"daac1f2c9b53e204015a740872b77a7bfb3fa699f089e40509e7fc20e601ca65"},"schema_version":"1.0","source":{"id":"1107.3515","kind":"arxiv","version":1}},"canonical_sha256":"422c432fdd219b9b31691fb3c56976336566470562be98f25234455cf5eca966","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"422c432fdd219b9b31691fb3c56976336566470562be98f25234455cf5eca966","first_computed_at":"2026-05-18T02:01:15.386243Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:15.386243Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"V5pZiLjLXrofmlP7vUGLvZAjfeJOBfkQnQByTPCUTe8R2ykvnkhBGHqFOtLmsMp/hS4VK9rgOEhX08ZVknytBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:15.386788Z","signed_message":"canonical_sha256_bytes"},"source_id":"1107.3515","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9b3aab927e6556195885552bf97a97bcbdd3eb2d98c8a91041e11264c30b5dd4","sha256:49dac06ffb79f38879a79771f1e8e3098a4beeae921ed92bce5d4ef69466df16"],"state_sha256":"103080b2a6378525696977281166481e309e3b0f87cc9a345bfe53f0e3693897"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NJnzyuAYf9X/xLEojaqkEBDjzPWHKK9FyaY0SGSikq2JRrATA9A60g1prDrkm+qllgb1H0mQWLo48PTZlTs9DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T18:49:17.179620Z","bundle_sha256":"2eba4e50ee6db7e27c0953a90ed547cfda80b9f559e25374952f3e56d1cdddad"}}