{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:M5AHSRZES33NFKFVBR5FX5UM2K","short_pith_number":"pith:M5AHSRZE","canonical_record":{"source":{"id":"1703.05338","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-03-15T18:03:19Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"d9d0d7b22ed642817af633150896d49e9e4be8450df7adae08c233a434f192a1","abstract_canon_sha256":"324eb136a70c34d2165bdfdd9403d3e9e66e111932edf3c35f8fcd8a1fb82b98"},"schema_version":"1.0"},"canonical_sha256":"674079472496f6d2a8b50c7a5bf68cd2b61510bea57ebf24d16f3aa4607b9125","source":{"kind":"arxiv","id":"1703.05338","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.05338","created_at":"2026-05-18T00:45:41Z"},{"alias_kind":"arxiv_version","alias_value":"1703.05338v1","created_at":"2026-05-18T00:45:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.05338","created_at":"2026-05-18T00:45:41Z"},{"alias_kind":"pith_short_12","alias_value":"M5AHSRZES33N","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_16","alias_value":"M5AHSRZES33NFKFV","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_8","alias_value":"M5AHSRZE","created_at":"2026-05-18T12:31:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:M5AHSRZES33NFKFVBR5FX5UM2K","target":"record","payload":{"canonical_record":{"source":{"id":"1703.05338","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-03-15T18:03:19Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"d9d0d7b22ed642817af633150896d49e9e4be8450df7adae08c233a434f192a1","abstract_canon_sha256":"324eb136a70c34d2165bdfdd9403d3e9e66e111932edf3c35f8fcd8a1fb82b98"},"schema_version":"1.0"},"canonical_sha256":"674079472496f6d2a8b50c7a5bf68cd2b61510bea57ebf24d16f3aa4607b9125","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:45:41.461356Z","signature_b64":"PaGtsyq0g9ApIzieNRmlNDZk77sCkuI/RxB4NKuA8fvCn8rLYDwzBnlwyhObf4wZms7ZI0PPGAM7OUes+h/JAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"674079472496f6d2a8b50c7a5bf68cd2b61510bea57ebf24d16f3aa4607b9125","last_reissued_at":"2026-05-18T00:45:41.460601Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:45:41.460601Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1703.05338","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":"2026-05-18T00:45:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F6mYnYmnWpGKie/4Ve+PplKFdYqkyERjS37vbLm1KIuta1fXJ/X+y55fYDyRvB67sXClKxvVN7kPwQ7+JCgEBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T17:56:11.543700Z"},"content_sha256":"dde1993235fbb774a09ff9d0496f5203ae6892323f84be0d6426e93fe44e09b2","schema_version":"1.0","event_id":"sha256:dde1993235fbb774a09ff9d0496f5203ae6892323f84be0d6426e93fe44e09b2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:M5AHSRZES33NFKFVBR5FX5UM2K","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the origin of the spiral morphology in the Elias 2-27 circumstellar disc","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Attila Juhasz, Cathie J. Clarke, Farzana Meru, Giovanni P. Rosotti, John D. Ilee, Richard A. Booth","submitted_at":"2017-03-15T18:03:19Z","abstract_excerpt":"The young star Elias 2-27 has recently been observed to posses a massive circumstellar disc with two prominent large-scale spiral arms. In this Letter we perform three-dimensional Smoothed Particle Hydrodynamics simulations, radiative transfer modelling, synthetic ALMA imaging and an unsharped masking technique to explore three possibilities for the origin of the observed structures -- an undetected companion either internal or external to the spirals, and a self-gravitating disc. We find that a gravitationally unstable disc and a disc with an external companion can produce morphology that is "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.05338","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":"2026-05-18T00:45:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"me5LVuLqRAwOz4kU+hnBImjPZJQbzFGii4LnSRL9ZvlUhtWqqkpZ7svlS2Ge+LKTNrVSskydSCW0w8dyFcsKDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T17:56:11.544103Z"},"content_sha256":"db10f46f319e7088b047b3776c32d0ba9f69a5f4bf416f54d211eab1facb1fb5","schema_version":"1.0","event_id":"sha256:db10f46f319e7088b047b3776c32d0ba9f69a5f4bf416f54d211eab1facb1fb5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/M5AHSRZES33NFKFVBR5FX5UM2K/bundle.json","state_url":"https://pith.science/pith/M5AHSRZES33NFKFVBR5FX5UM2K/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/M5AHSRZES33NFKFVBR5FX5UM2K/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":"2026-05-29T17:56:11Z","links":{"resolver":"https://pith.science/pith/M5AHSRZES33NFKFVBR5FX5UM2K","bundle":"https://pith.science/pith/M5AHSRZES33NFKFVBR5FX5UM2K/bundle.json","state":"https://pith.science/pith/M5AHSRZES33NFKFVBR5FX5UM2K/state.json","well_known_bundle":"https://pith.science/.well-known/pith/M5AHSRZES33NFKFVBR5FX5UM2K/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:M5AHSRZES33NFKFVBR5FX5UM2K","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":"324eb136a70c34d2165bdfdd9403d3e9e66e111932edf3c35f8fcd8a1fb82b98","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-03-15T18:03:19Z","title_canon_sha256":"d9d0d7b22ed642817af633150896d49e9e4be8450df7adae08c233a434f192a1"},"schema_version":"1.0","source":{"id":"1703.05338","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.05338","created_at":"2026-05-18T00:45:41Z"},{"alias_kind":"arxiv_version","alias_value":"1703.05338v1","created_at":"2026-05-18T00:45:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.05338","created_at":"2026-05-18T00:45:41Z"},{"alias_kind":"pith_short_12","alias_value":"M5AHSRZES33N","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_16","alias_value":"M5AHSRZES33NFKFV","created_at":"2026-05-18T12:31:28Z"},{"alias_kind":"pith_short_8","alias_value":"M5AHSRZE","created_at":"2026-05-18T12:31:28Z"}],"graph_snapshots":[{"event_id":"sha256:db10f46f319e7088b047b3776c32d0ba9f69a5f4bf416f54d211eab1facb1fb5","target":"graph","created_at":"2026-05-18T00:45:41Z","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":"The young star Elias 2-27 has recently been observed to posses a massive circumstellar disc with two prominent large-scale spiral arms. In this Letter we perform three-dimensional Smoothed Particle Hydrodynamics simulations, radiative transfer modelling, synthetic ALMA imaging and an unsharped masking technique to explore three possibilities for the origin of the observed structures -- an undetected companion either internal or external to the spirals, and a self-gravitating disc. We find that a gravitationally unstable disc and a disc with an external companion can produce morphology that is ","authors_text":"Attila Juhasz, Cathie J. Clarke, Farzana Meru, Giovanni P. Rosotti, John D. Ilee, Richard A. Booth","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-03-15T18:03:19Z","title":"On the origin of the spiral morphology in the Elias 2-27 circumstellar disc"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.05338","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:dde1993235fbb774a09ff9d0496f5203ae6892323f84be0d6426e93fe44e09b2","target":"record","created_at":"2026-05-18T00:45:41Z","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":"324eb136a70c34d2165bdfdd9403d3e9e66e111932edf3c35f8fcd8a1fb82b98","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-03-15T18:03:19Z","title_canon_sha256":"d9d0d7b22ed642817af633150896d49e9e4be8450df7adae08c233a434f192a1"},"schema_version":"1.0","source":{"id":"1703.05338","kind":"arxiv","version":1}},"canonical_sha256":"674079472496f6d2a8b50c7a5bf68cd2b61510bea57ebf24d16f3aa4607b9125","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"674079472496f6d2a8b50c7a5bf68cd2b61510bea57ebf24d16f3aa4607b9125","first_computed_at":"2026-05-18T00:45:41.460601Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:45:41.460601Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PaGtsyq0g9ApIzieNRmlNDZk77sCkuI/RxB4NKuA8fvCn8rLYDwzBnlwyhObf4wZms7ZI0PPGAM7OUes+h/JAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:45:41.461356Z","signed_message":"canonical_sha256_bytes"},"source_id":"1703.05338","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dde1993235fbb774a09ff9d0496f5203ae6892323f84be0d6426e93fe44e09b2","sha256:db10f46f319e7088b047b3776c32d0ba9f69a5f4bf416f54d211eab1facb1fb5"],"state_sha256":"f5939f2dc9b1f237a73ad0cb17515960b6985166e443cefa163ebdb9e118591c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"j4KNmsm1sG3OlvRORM8iuN3hHfqthhGfJkzV2ww7ekPNV4MwIcjT3YGbV5otDp0WFo1WPm1+6liXPgW+XQl1BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T17:56:11.546235Z","bundle_sha256":"63ba2d7fe26efa0a029ee8355ab2c67fcc5657c629447f4b3641f7b115095256"}}