{"paper":{"title":"Oort Cloud Ecology -- IV. Exchanging Asteroids","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Sub-virial fractal star clusters exchange asteroids more readily than virialised Plummer clusters, and both suppress Oort Cloud formation.","cross_cats":["astro-ph.GA","astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Erwan Hochart, Simon Portegies Zwart","submitted_at":"2026-04-21T12:45:16Z","abstract_excerpt":"Aims. Investigate the influence of cluster environments on asteroids, with special attention towards captured material. Methods. Using numerical methods, a sub-virial fractally distributed star-forming region and a virialised Plummer distributed star-forming region are simulated. Both models are initialised with a virial radius of 0.5pc and 150 stars. Stellar populations and their corresponding planetary systems are identical between cluster models. Stars initially host 500 asteroids and those with mass M_* <= 2.0 MSun are also orbited by 1 - 8 planets. Clusters are integrated until 30 Myr. Re"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The sub-virial fractal cluster exhibits richer dynamics, with asteroids and planets more frequently acquiring high eccentricities and inclinations, along with a larger fraction of captured and rogue objects. Additionally, this cluster configuration has its extreme trans-Neptunian object and Sednoid analogues occupy regions of phase-space in semi-major axis, eccentricity and inclination commonly frequented by captured asteroids.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The chosen initial conditions (virial radius of 0.5 pc, 150 stars, exactly 500 asteroids per star, 1-8 planets for stars below 2 solar masses, and integration to exactly 30 Myr) are representative of real star-forming regions and sufficient to capture the dominant processes for Oort Cloud assembly and asteroid exchange.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Sub-virial fractal star clusters produce more captured asteroids, rogue objects, and high-eccentricity/inclination bodies than virialised Plummer clusters, but Oort Cloud formation is suppressed in both.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Sub-virial fractal star clusters exchange asteroids more readily than virialised Plummer clusters, and both suppress Oort Cloud formation.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"be679a42f69380a65aca4ea455e359e96df1028fc51150fedf345f35da4262fd"},"source":{"id":"2604.19413","kind":"arxiv","version":2},"verdict":{"id":"f61132e0-a457-4ad8-9056-9451f51dce6e","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T01:43:06.838061Z","strongest_claim":"The sub-virial fractal cluster exhibits richer dynamics, with asteroids and planets more frequently acquiring high eccentricities and inclinations, along with a larger fraction of captured and rogue objects. Additionally, this cluster configuration has its extreme trans-Neptunian object and Sednoid analogues occupy regions of phase-space in semi-major axis, eccentricity and inclination commonly frequented by captured asteroids.","one_line_summary":"Sub-virial fractal star clusters produce more captured asteroids, rogue objects, and high-eccentricity/inclination bodies than virialised Plummer clusters, but Oort Cloud formation is suppressed in both.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The chosen initial conditions (virial radius of 0.5 pc, 150 stars, exactly 500 asteroids per star, 1-8 planets for stars below 2 solar masses, and integration to exactly 30 Myr) are representative of real star-forming regions and sufficient to capture the dominant processes for Oort Cloud assembly and asteroid exchange.","pith_extraction_headline":"Sub-virial fractal star clusters exchange asteroids more readily than virialised Plummer clusters, and both suppress Oort Cloud formation."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.19413/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_compliance","ran_at":"2026-05-20T02:59:56.048501Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"9399563dee721645fc9f476ff6eda01b5e87c5fdec327d3724e6c89d24765b41"},"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"}