{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:DVSQAKFCQ5J5BCOOZ5UYTPGECS","short_pith_number":"pith:DVSQAKFC","canonical_record":{"source":{"id":"1911.11911","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-11-27T01:58:26Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"25fbbe21e2af4189bd1abfab4bb851d8e9e3828143389ac0c1a8a35c4a6db5aa","abstract_canon_sha256":"6f49f723ff414d1ab3f398dce6fdc7f50b6f2370520355ddcc6f5af2afb6fb2f"},"schema_version":"1.0"},"canonical_sha256":"1d650028a28753d089cecf6989bcc414becdadbbf07487487a3d8bb76e93394d","source":{"kind":"arxiv","id":"1911.11911","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1911.11911","created_at":"2026-07-05T00:38:08Z"},{"alias_kind":"arxiv_version","alias_value":"1911.11911v2","created_at":"2026-07-05T00:38:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1911.11911","created_at":"2026-07-05T00:38:08Z"},{"alias_kind":"pith_short_12","alias_value":"DVSQAKFCQ5J5","created_at":"2026-07-05T00:38:08Z"},{"alias_kind":"pith_short_16","alias_value":"DVSQAKFCQ5J5BCOO","created_at":"2026-07-05T00:38:08Z"},{"alias_kind":"pith_short_8","alias_value":"DVSQAKFC","created_at":"2026-07-05T00:38:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:DVSQAKFCQ5J5BCOOZ5UYTPGECS","target":"record","payload":{"canonical_record":{"source":{"id":"1911.11911","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-11-27T01:58:26Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"25fbbe21e2af4189bd1abfab4bb851d8e9e3828143389ac0c1a8a35c4a6db5aa","abstract_canon_sha256":"6f49f723ff414d1ab3f398dce6fdc7f50b6f2370520355ddcc6f5af2afb6fb2f"},"schema_version":"1.0"},"canonical_sha256":"1d650028a28753d089cecf6989bcc414becdadbbf07487487a3d8bb76e93394d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:38:08.080169Z","signature_b64":"CErtRI0zt18Gxm7+hKFDNf8iziEMz1hXrn1e9WAD9S90YEz2Hh52uREt4PhoqqapjjeWw000GKbdV4m4ndWaAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1d650028a28753d089cecf6989bcc414becdadbbf07487487a3d8bb76e93394d","last_reissued_at":"2026-07-05T00:38:08.079813Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:38:08.079813Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1911.11911","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":"2026-07-05T00:38:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vewFshHGMmalW0wJ7p+R/hwsoNg7m0IcV91GSpgX+JKpnV/nOqWWbWkYHmzgYxIjpu46fAjjBtX5IE1cvJ4aBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T14:30:39.563523Z"},"content_sha256":"fa90964dda1d60abdb3bf3fd94599846f9c21f0f079f4d10d94ccd7c20913598","schema_version":"1.0","event_id":"sha256:fa90964dda1d60abdb3bf3fd94599846f9c21f0f079f4d10d94ccd7c20913598"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:DVSQAKFCQ5J5BCOOZ5UYTPGECS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The M31/M33 tidal interaction: A hydrodynamic simulation of the extended gas distribution","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Di Li, Joss Bland-Hawthorn, Thor Tepper-Garc\\'ia","submitted_at":"2019-11-27T01:58:26Z","abstract_excerpt":"We revisit the orbital history of the Triangulum galaxy (M33) around the Andromeda galaxy (M31) in view of the recent Gaia Data Release 2 proper motion measurements for both Local Group galaxies. Earlier studies consider highly idealised dynamical friction, but neglect the effects of dynamical mass loss. We show the latter process to be important using mutually consistent orbit integration and N-body simulations. Following this approach we find an orbital solution that brings these galaxies to within ~50 kpc of each other in the past, ~6.5 Gyr ago. We explore the implications of their interact"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1911.11911","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1911.11911/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:38:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"El8fixi9M5P/NFS01covXgW2TR/JPB38lgCuIuiyGPnnPz4IGbeBcDxxAtls2SnFNQGW+U8zSZZQrD/2OE95AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T14:30:39.564486Z"},"content_sha256":"838a6c53d909d65d244517679f1bbe61e530e29585bcd7e1ec6b73a16f701c16","schema_version":"1.0","event_id":"sha256:838a6c53d909d65d244517679f1bbe61e530e29585bcd7e1ec6b73a16f701c16"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DVSQAKFCQ5J5BCOOZ5UYTPGECS/bundle.json","state_url":"https://pith.science/pith/DVSQAKFCQ5J5BCOOZ5UYTPGECS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DVSQAKFCQ5J5BCOOZ5UYTPGECS/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":"2026-08-23T14:30:39Z","links":{"resolver":"https://pith.science/pith/DVSQAKFCQ5J5BCOOZ5UYTPGECS","bundle":"https://pith.science/pith/DVSQAKFCQ5J5BCOOZ5UYTPGECS/bundle.json","state":"https://pith.science/pith/DVSQAKFCQ5J5BCOOZ5UYTPGECS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DVSQAKFCQ5J5BCOOZ5UYTPGECS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:DVSQAKFCQ5J5BCOOZ5UYTPGECS","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":"6f49f723ff414d1ab3f398dce6fdc7f50b6f2370520355ddcc6f5af2afb6fb2f","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-11-27T01:58:26Z","title_canon_sha256":"25fbbe21e2af4189bd1abfab4bb851d8e9e3828143389ac0c1a8a35c4a6db5aa"},"schema_version":"1.0","source":{"id":"1911.11911","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1911.11911","created_at":"2026-07-05T00:38:08Z"},{"alias_kind":"arxiv_version","alias_value":"1911.11911v2","created_at":"2026-07-05T00:38:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1911.11911","created_at":"2026-07-05T00:38:08Z"},{"alias_kind":"pith_short_12","alias_value":"DVSQAKFCQ5J5","created_at":"2026-07-05T00:38:08Z"},{"alias_kind":"pith_short_16","alias_value":"DVSQAKFCQ5J5BCOO","created_at":"2026-07-05T00:38:08Z"},{"alias_kind":"pith_short_8","alias_value":"DVSQAKFC","created_at":"2026-07-05T00:38:08Z"}],"graph_snapshots":[{"event_id":"sha256:838a6c53d909d65d244517679f1bbe61e530e29585bcd7e1ec6b73a16f701c16","target":"graph","created_at":"2026-07-05T00:38:08Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1911.11911/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We revisit the orbital history of the Triangulum galaxy (M33) around the Andromeda galaxy (M31) in view of the recent Gaia Data Release 2 proper motion measurements for both Local Group galaxies. Earlier studies consider highly idealised dynamical friction, but neglect the effects of dynamical mass loss. We show the latter process to be important using mutually consistent orbit integration and N-body simulations. Following this approach we find an orbital solution that brings these galaxies to within ~50 kpc of each other in the past, ~6.5 Gyr ago. We explore the implications of their interact","authors_text":"Di Li, Joss Bland-Hawthorn, Thor Tepper-Garc\\'ia","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-11-27T01:58:26Z","title":"The M31/M33 tidal interaction: A hydrodynamic simulation of the extended gas distribution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1911.11911","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:fa90964dda1d60abdb3bf3fd94599846f9c21f0f079f4d10d94ccd7c20913598","target":"record","created_at":"2026-07-05T00:38:08Z","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":"6f49f723ff414d1ab3f398dce6fdc7f50b6f2370520355ddcc6f5af2afb6fb2f","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-11-27T01:58:26Z","title_canon_sha256":"25fbbe21e2af4189bd1abfab4bb851d8e9e3828143389ac0c1a8a35c4a6db5aa"},"schema_version":"1.0","source":{"id":"1911.11911","kind":"arxiv","version":2}},"canonical_sha256":"1d650028a28753d089cecf6989bcc414becdadbbf07487487a3d8bb76e93394d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1d650028a28753d089cecf6989bcc414becdadbbf07487487a3d8bb76e93394d","first_computed_at":"2026-07-05T00:38:08.079813Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:38:08.079813Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CErtRI0zt18Gxm7+hKFDNf8iziEMz1hXrn1e9WAD9S90YEz2Hh52uREt4PhoqqapjjeWw000GKbdV4m4ndWaAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T00:38:08.080169Z","signed_message":"canonical_sha256_bytes"},"source_id":"1911.11911","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fa90964dda1d60abdb3bf3fd94599846f9c21f0f079f4d10d94ccd7c20913598","sha256:838a6c53d909d65d244517679f1bbe61e530e29585bcd7e1ec6b73a16f701c16"],"state_sha256":"db554e739652b5c809d544803c7e005a8754ad344ac95e7318bea344f1f6638d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TckhlD7tOHpa+y34DvWu1kgzkYt3bx00MqNBBfLLfGUHTQcCMZjoINHks2VchxcgnTsmiBVgRof4gD5ZRNMkCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T14:30:39.570841Z","bundle_sha256":"5d07674cb4b407ccd0a63513cc4d27866362fe49847722bd5a806502b70aa8d8"}}