{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:NYUNHIO72HJB2UV4HHR3QHDNL2","short_pith_number":"pith:NYUNHIO7","canonical_record":{"source":{"id":"1111.1813","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-11-08T06:40:48Z","cross_cats_sorted":[],"title_canon_sha256":"c2daea16f6cdbec0b57950f3d1564fe3506cb59635cb7d3de5a58ee69809046e","abstract_canon_sha256":"00c870ee17f544c8c3bd50cccd96a1eaf2f263647896fd08916360fc7db9609c"},"schema_version":"1.0"},"canonical_sha256":"6e28d3a1dfd1d21d52bc39e3b81c6d5ebe6e65787f36a6af28197604b61cc206","source":{"kind":"arxiv","id":"1111.1813","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.1813","created_at":"2026-05-18T01:59:43Z"},{"alias_kind":"arxiv_version","alias_value":"1111.1813v2","created_at":"2026-05-18T01:59:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.1813","created_at":"2026-05-18T01:59:43Z"},{"alias_kind":"pith_short_12","alias_value":"NYUNHIO72HJB","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_16","alias_value":"NYUNHIO72HJB2UV4","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_8","alias_value":"NYUNHIO7","created_at":"2026-05-18T12:26:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:NYUNHIO72HJB2UV4HHR3QHDNL2","target":"record","payload":{"canonical_record":{"source":{"id":"1111.1813","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-11-08T06:40:48Z","cross_cats_sorted":[],"title_canon_sha256":"c2daea16f6cdbec0b57950f3d1564fe3506cb59635cb7d3de5a58ee69809046e","abstract_canon_sha256":"00c870ee17f544c8c3bd50cccd96a1eaf2f263647896fd08916360fc7db9609c"},"schema_version":"1.0"},"canonical_sha256":"6e28d3a1dfd1d21d52bc39e3b81c6d5ebe6e65787f36a6af28197604b61cc206","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:59:43.918166Z","signature_b64":"fGgwYpLDZOP+DbK1C/CkY6DVGqaqh+wIB+/shHWy5/+q5wszwc+xnGUy8NUOvaEEPhuq7qJRx2WebWmR1t1mAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6e28d3a1dfd1d21d52bc39e3b81c6d5ebe6e65787f36a6af28197604b61cc206","last_reissued_at":"2026-05-18T01:59:43.917521Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:59:43.917521Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1111.1813","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:59:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OW01++ZKm/Mf9lcC5JTLdua9DMeAJg6bbGNiCyR+nshr4YmWEeZNSVGNaVC1lBgcb5JlIXPQ8/bWSnPYkFBjBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T21:19:56.111004Z"},"content_sha256":"3fbd315c35584378fc96c756bec07a4d203c502429add7aff813600761bdca63","schema_version":"1.0","event_id":"sha256:3fbd315c35584378fc96c756bec07a4d203c502429add7aff813600761bdca63"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:NYUNHIO72HJB2UV4HHR3QHDNL2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"First Keck Nulling Observations of a Young Stellar Object: Probing the Circumstellar Environment of the Herbig Ae star MWC 325","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"K. Ohnaka, L. Hillenbrand, M. Hrynevych, M. M. Colavita, R. L. Akeson, R. Millan-Gabet, S. Ragland, S. T. Ridgway, W. A. Traub, W. C. Danchi, W. Cotton","submitted_at":"2011-11-08T06:40:48Z","abstract_excerpt":"We present the first N-band nulling plus K- and L-band V2 observations of a young stellar object, MWC325, taken with the 85 m baseline Keck Interferometer. The Keck nuller was designed for the study of faint dust signatures associated with debris disks, but it also has a unique capability for studying the temperature and density distribution of denser disks found around young stellar objects. Interferometric observations of MWC 325 at K, L and N encompass a factor of five in spectral range and thus, especially when spectrally dispersed within each band, enable characterization of the structure"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.1813","kind":"arxiv","version":2},"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":"2026-05-18T01:59:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lk0LFuUyIU0LeoYzIrn/3KikLBuaifAUZIdP3B7xAMnJmaHYxlN0RwB4/jnm/vf2SfFQFAoEwm8gc6vxC+AkBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T21:19:56.111656Z"},"content_sha256":"da1b457bd0895af5b51750381aea8f174d8b2f2837a8fa4fc3badc51186fab6e","schema_version":"1.0","event_id":"sha256:da1b457bd0895af5b51750381aea8f174d8b2f2837a8fa4fc3badc51186fab6e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NYUNHIO72HJB2UV4HHR3QHDNL2/bundle.json","state_url":"https://pith.science/pith/NYUNHIO72HJB2UV4HHR3QHDNL2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NYUNHIO72HJB2UV4HHR3QHDNL2/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":"2026-05-25T21:19:56Z","links":{"resolver":"https://pith.science/pith/NYUNHIO72HJB2UV4HHR3QHDNL2","bundle":"https://pith.science/pith/NYUNHIO72HJB2UV4HHR3QHDNL2/bundle.json","state":"https://pith.science/pith/NYUNHIO72HJB2UV4HHR3QHDNL2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NYUNHIO72HJB2UV4HHR3QHDNL2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:NYUNHIO72HJB2UV4HHR3QHDNL2","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":"00c870ee17f544c8c3bd50cccd96a1eaf2f263647896fd08916360fc7db9609c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-11-08T06:40:48Z","title_canon_sha256":"c2daea16f6cdbec0b57950f3d1564fe3506cb59635cb7d3de5a58ee69809046e"},"schema_version":"1.0","source":{"id":"1111.1813","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.1813","created_at":"2026-05-18T01:59:43Z"},{"alias_kind":"arxiv_version","alias_value":"1111.1813v2","created_at":"2026-05-18T01:59:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.1813","created_at":"2026-05-18T01:59:43Z"},{"alias_kind":"pith_short_12","alias_value":"NYUNHIO72HJB","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_16","alias_value":"NYUNHIO72HJB2UV4","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_8","alias_value":"NYUNHIO7","created_at":"2026-05-18T12:26:37Z"}],"graph_snapshots":[{"event_id":"sha256:da1b457bd0895af5b51750381aea8f174d8b2f2837a8fa4fc3badc51186fab6e","target":"graph","created_at":"2026-05-18T01:59:43Z","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":"We present the first N-band nulling plus K- and L-band V2 observations of a young stellar object, MWC325, taken with the 85 m baseline Keck Interferometer. The Keck nuller was designed for the study of faint dust signatures associated with debris disks, but it also has a unique capability for studying the temperature and density distribution of denser disks found around young stellar objects. Interferometric observations of MWC 325 at K, L and N encompass a factor of five in spectral range and thus, especially when spectrally dispersed within each band, enable characterization of the structure","authors_text":"K. Ohnaka, L. Hillenbrand, M. Hrynevych, M. M. Colavita, R. L. Akeson, R. Millan-Gabet, S. Ragland, S. T. Ridgway, W. A. Traub, W. C. Danchi, W. Cotton","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-11-08T06:40:48Z","title":"First Keck Nulling Observations of a Young Stellar Object: Probing the Circumstellar Environment of the Herbig Ae star MWC 325"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.1813","kind":"arxiv","version":2},"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":"sha256:3fbd315c35584378fc96c756bec07a4d203c502429add7aff813600761bdca63","target":"record","created_at":"2026-05-18T01:59:43Z","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":"00c870ee17f544c8c3bd50cccd96a1eaf2f263647896fd08916360fc7db9609c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-11-08T06:40:48Z","title_canon_sha256":"c2daea16f6cdbec0b57950f3d1564fe3506cb59635cb7d3de5a58ee69809046e"},"schema_version":"1.0","source":{"id":"1111.1813","kind":"arxiv","version":2}},"canonical_sha256":"6e28d3a1dfd1d21d52bc39e3b81c6d5ebe6e65787f36a6af28197604b61cc206","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6e28d3a1dfd1d21d52bc39e3b81c6d5ebe6e65787f36a6af28197604b61cc206","first_computed_at":"2026-05-18T01:59:43.917521Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:59:43.917521Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fGgwYpLDZOP+DbK1C/CkY6DVGqaqh+wIB+/shHWy5/+q5wszwc+xnGUy8NUOvaEEPhuq7qJRx2WebWmR1t1mAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:59:43.918166Z","signed_message":"canonical_sha256_bytes"},"source_id":"1111.1813","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3fbd315c35584378fc96c756bec07a4d203c502429add7aff813600761bdca63","sha256:da1b457bd0895af5b51750381aea8f174d8b2f2837a8fa4fc3badc51186fab6e"],"state_sha256":"70229714790428e23b2fdc0dc9e7e92b4e9513477b66009ff767a08958b16aaf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tizqiJYhofN7LcA75aQxq4eIOUyhKEEmR73LeZiLipkd4lOACYK0NUmv8HrogNwvhuFjxGoGZWKBO7OV4/FlBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T21:19:56.115010Z","bundle_sha256":"b4a4ee1851b1397476512971327b14d2ade349c4cdf1f28b5d54ff60a7e2b46b"}}