{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:LXRNPT2IMHSWWYXHXTIGW2WW4X","short_pith_number":"pith:LXRNPT2I","canonical_record":{"source":{"id":"1511.07590","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-11-24T06:48:32Z","cross_cats_sorted":[],"title_canon_sha256":"74e73c6549ccad01856100fd5eb8863e31d1b1b3554797658e5de17ca381a529","abstract_canon_sha256":"5bced2e46ba065a5ad2f82c85abd03669136353dd34d0aebf8e58a689d70f330"},"schema_version":"1.0"},"canonical_sha256":"5de2d7cf4861e56b62e7bcd06b6ad6e5c56c1f930ecff8d583bdd56dc859dac4","source":{"kind":"arxiv","id":"1511.07590","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.07590","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"arxiv_version","alias_value":"1511.07590v1","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.07590","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"pith_short_12","alias_value":"LXRNPT2IMHSW","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LXRNPT2IMHSWWYXH","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LXRNPT2I","created_at":"2026-05-18T12:29:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:LXRNPT2IMHSWWYXHXTIGW2WW4X","target":"record","payload":{"canonical_record":{"source":{"id":"1511.07590","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-11-24T06:48:32Z","cross_cats_sorted":[],"title_canon_sha256":"74e73c6549ccad01856100fd5eb8863e31d1b1b3554797658e5de17ca381a529","abstract_canon_sha256":"5bced2e46ba065a5ad2f82c85abd03669136353dd34d0aebf8e58a689d70f330"},"schema_version":"1.0"},"canonical_sha256":"5de2d7cf4861e56b62e7bcd06b6ad6e5c56c1f930ecff8d583bdd56dc859dac4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:23:53.990305Z","signature_b64":"Nt8VBnnOmEPx4y5br/xyFvE9aRrFgMJ3aenw8OtrvWjJdMt3Um1QPjgrZ91r2EgSTeo1pTNkWQ9/xvCt2IcqBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5de2d7cf4861e56b62e7bcd06b6ad6e5c56c1f930ecff8d583bdd56dc859dac4","last_reissued_at":"2026-05-18T01:23:53.989711Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:23:53.989711Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1511.07590","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":"2026-05-18T01:23:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nQaqlqBt/ipMMs8pidtJaybp0RV7i3CoGFS7CAtQBEAEEjHW/lt3YY2xh6HLNRy1f/sEbazVm2FMo7JJvdbSDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:55:08.414461Z"},"content_sha256":"a021311a272fbd5ed22184e9015a408e17f64be9c99382e6b79f84ea74280bb8","schema_version":"1.0","event_id":"sha256:a021311a272fbd5ed22184e9015a408e17f64be9c99382e6b79f84ea74280bb8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:LXRNPT2IMHSWWYXHXTIGW2WW4X","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"DR Tau: Temporal variability of the brightness distribution in the potential planet-forming region","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Florian Ober, Robert Brunngr\\\"aber, Sebastian Wolf, Thorsten Ratzka","submitted_at":"2015-11-24T06:48:32Z","abstract_excerpt":"We investigate the variability of the brightness distribution and the changing density structure of the protoplanetary disk around DR Tau, a classical T Tauri star. DR Tau is known for its peculiar variations from the ultraviolet (UV) to the mid-infrared (MIR). Our goal is to constrain the temporal variation of the disk structure based on photometric and MIR interferometric data. We observed DR Tau with the MID-infrared Interferometric instrument (MIDI) at the Very Large Telescope Interferometer (VLTI) at three epochs separated by about nine years, two months, respectively. We fit the spectral"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.07590","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":"2026-05-18T01:23:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zFnez7k1ylS/tCAcTav8ZZUgMCSXjKwqwBJ0e/iORFlNK86NyUTvZmaC8zsGfrMOTLI7AQ4ae/09ed3IPlHEBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:55:08.415295Z"},"content_sha256":"b04bc35c1fe13c85f32bf16173ba1e25a63ec2da5d425330ef4c2bd5466da989","schema_version":"1.0","event_id":"sha256:b04bc35c1fe13c85f32bf16173ba1e25a63ec2da5d425330ef4c2bd5466da989"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LXRNPT2IMHSWWYXHXTIGW2WW4X/bundle.json","state_url":"https://pith.science/pith/LXRNPT2IMHSWWYXHXTIGW2WW4X/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LXRNPT2IMHSWWYXHXTIGW2WW4X/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":"2026-05-25T18:55:08Z","links":{"resolver":"https://pith.science/pith/LXRNPT2IMHSWWYXHXTIGW2WW4X","bundle":"https://pith.science/pith/LXRNPT2IMHSWWYXHXTIGW2WW4X/bundle.json","state":"https://pith.science/pith/LXRNPT2IMHSWWYXHXTIGW2WW4X/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LXRNPT2IMHSWWYXHXTIGW2WW4X/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:LXRNPT2IMHSWWYXHXTIGW2WW4X","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":"5bced2e46ba065a5ad2f82c85abd03669136353dd34d0aebf8e58a689d70f330","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-11-24T06:48:32Z","title_canon_sha256":"74e73c6549ccad01856100fd5eb8863e31d1b1b3554797658e5de17ca381a529"},"schema_version":"1.0","source":{"id":"1511.07590","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.07590","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"arxiv_version","alias_value":"1511.07590v1","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.07590","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"pith_short_12","alias_value":"LXRNPT2IMHSW","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LXRNPT2IMHSWWYXH","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LXRNPT2I","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:b04bc35c1fe13c85f32bf16173ba1e25a63ec2da5d425330ef4c2bd5466da989","target":"graph","created_at":"2026-05-18T01:23:53Z","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 investigate the variability of the brightness distribution and the changing density structure of the protoplanetary disk around DR Tau, a classical T Tauri star. DR Tau is known for its peculiar variations from the ultraviolet (UV) to the mid-infrared (MIR). Our goal is to constrain the temporal variation of the disk structure based on photometric and MIR interferometric data. We observed DR Tau with the MID-infrared Interferometric instrument (MIDI) at the Very Large Telescope Interferometer (VLTI) at three epochs separated by about nine years, two months, respectively. We fit the spectral","authors_text":"Florian Ober, Robert Brunngr\\\"aber, Sebastian Wolf, Thorsten Ratzka","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-11-24T06:48:32Z","title":"DR Tau: Temporal variability of the brightness distribution in the potential planet-forming region"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.07590","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:a021311a272fbd5ed22184e9015a408e17f64be9c99382e6b79f84ea74280bb8","target":"record","created_at":"2026-05-18T01:23:53Z","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":"5bced2e46ba065a5ad2f82c85abd03669136353dd34d0aebf8e58a689d70f330","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-11-24T06:48:32Z","title_canon_sha256":"74e73c6549ccad01856100fd5eb8863e31d1b1b3554797658e5de17ca381a529"},"schema_version":"1.0","source":{"id":"1511.07590","kind":"arxiv","version":1}},"canonical_sha256":"5de2d7cf4861e56b62e7bcd06b6ad6e5c56c1f930ecff8d583bdd56dc859dac4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5de2d7cf4861e56b62e7bcd06b6ad6e5c56c1f930ecff8d583bdd56dc859dac4","first_computed_at":"2026-05-18T01:23:53.989711Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:23:53.989711Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Nt8VBnnOmEPx4y5br/xyFvE9aRrFgMJ3aenw8OtrvWjJdMt3Um1QPjgrZ91r2EgSTeo1pTNkWQ9/xvCt2IcqBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:23:53.990305Z","signed_message":"canonical_sha256_bytes"},"source_id":"1511.07590","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a021311a272fbd5ed22184e9015a408e17f64be9c99382e6b79f84ea74280bb8","sha256:b04bc35c1fe13c85f32bf16173ba1e25a63ec2da5d425330ef4c2bd5466da989"],"state_sha256":"67f0dc4232ea9378419709886d59b3d9028eee55f1cbba9d8472dd1f7d975eb2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ot4ktWSZeC7Tjxmsm+S3xcwgYceTmNXK+qG69IRu2HuBJaxHxLn7uQRq9IgZTGec5k4nRbpD6zOmgvDZ+yimBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T18:55:08.417869Z","bundle_sha256":"e1085d29e12e4386d07a56a73e4288e0ea7736fc30506a8f50c482f361ee6122"}}