{"paper":{"title":"Kinematics of Wolf-Rayet Stars in the LMC: Clues to Subtype Origins","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Transverse velocities of LMC Wolf-Rayet stars indicate distinct ejection mechanisms for different subtypes.","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Caden Burkhardt, Fiona Han, Mathieu Renzo, M. S. Oey, Natalia Ivanova","submitted_at":"2026-03-11T14:33:18Z","abstract_excerpt":"We measure transverse proper motion velocities of LMC Wolf-Rayet (WR) stars using Gaia DR3 astrometry. The combined velocity distribution of WNh, O If*/WN, and WNL very massive stars ($>100\\ M_\\odot$; VMS) shows both slow, unejected objects ($v_\\perp < 10$ $\\rm km\\ s^{-1}$) and stars dominated by fast, runaway velocities ($v_\\perp > 24$ $\\rm km\\ s^{-1}$). This supports expectations that VMS ages are comparable to the dynamical ejection timescale ($\\sim1.5$ Myr). These kinematics share similarities with those of lower-luminosity, classical WNh, O If*/WN, and WNL stars, as well as the SMC field "},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The combined velocity distribution of WNh, O If*/WN, and WNL very massive stars shows both slow, unejected objects (v_perp < 10 km s^{-1}) and stars dominated by fast, runaway velocities (v_perp > 24 km s^{-1}), supporting that VMS ages are comparable to the dynamical ejection timescale (~1.5 Myr).","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the observed transverse velocity distributions directly trace distinct ejection mechanisms without major biases from projection effects, incomplete sampling, or unaccounted radial velocity components.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Gaia DR3 proper motions of LMC Wolf-Rayet stars reveal distinct velocity distributions across subtypes, indicating dynamical ejections dominate some populations while others arise from binary mass transfer or explosive mergers.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Transverse velocities of LMC Wolf-Rayet stars indicate distinct ejection mechanisms for different subtypes.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"f2e610c3b5c8147e395c6283e44611084677dacd66da813e01e00f8eaf0c7107"},"source":{"id":"2603.10826","kind":"arxiv","version":3},"verdict":{"id":"24f78ccd-400e-471d-a38c-dc1d1448a704","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T12:59:32.788751Z","strongest_claim":"The combined velocity distribution of WNh, O If*/WN, and WNL very massive stars shows both slow, unejected objects (v_perp < 10 km s^{-1}) and stars dominated by fast, runaway velocities (v_perp > 24 km s^{-1}), supporting that VMS ages are comparable to the dynamical ejection timescale (~1.5 Myr).","one_line_summary":"Gaia DR3 proper motions of LMC Wolf-Rayet stars reveal distinct velocity distributions across subtypes, indicating dynamical ejections dominate some populations while others arise from binary mass transfer or explosive mergers.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the observed transverse velocity distributions directly trace distinct ejection mechanisms without major biases from projection effects, incomplete sampling, or unaccounted radial velocity components.","pith_extraction_headline":"Transverse velocities of LMC Wolf-Rayet stars indicate distinct ejection mechanisms for different subtypes."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2603.10826/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":1,"snapshot_sha256":"82369d3bbbe07b910974fd9bc90cb34de0f5923fc62c42ddc485222c45996dea"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}