{"paper":{"title":"SPYGLASS. VII-B. Tracing the Fragments of Massive Star Formation Using Low-Mass Associations","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Dynamical traceback links low-mass associations to shared formation sites whose feedback explains Local and Orion-Eridanus Bubble shapes.","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"Adam L. Kraus, Facundo P\\'erez Paolino, Jonathan C. Tan, Jos\\'e G. Fern\\'andez-Trincado, Joshua S. Speagle, Juan P. Farias, Julio Chanam\\'e, Keith Hawkins, Ronan Kerr","submitted_at":"2026-04-29T18:02:18Z","abstract_excerpt":"New observations from the Gaia spacecraft have traced an emerging demographic of low-mass associations disconnected from larger associations or GMCs. The first of these associations were recently characterized, but the star-forming environments they trace remain unknown. Using new velocities and ages alongside literature catalogs, we uncover the origins of 16 low-mass associations ($M\\lesssim100$ M$_{\\odot}$, $\\tau\\lesssim50$ Myr) using dynamical traceback. We reveal that three groups of currently disparate populations share common formation sites, comprising the Leo, CaNMoS, and AquENS associ"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We find that feedback from the oldest co-spatial and co-moving relatives of these associations can explain the current morphologies of the Local and Orion-Eridanus Bubbles, along with the formation of related associations like Sco-Cen and Orion OB1.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The dynamical traceback accurately reconstructs past formation sites without large errors from velocity uncertainties, incomplete membership, or unaccounted gravitational interactions (invoked throughout the traceback analysis described in the abstract).","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Dynamical traceback of 16 low-mass associations shows most originated from larger complexes or feedback-driven bubbles, with one possibly from an intermediate-velocity cloud collision in Orion.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Dynamical traceback links low-mass associations to shared formation sites whose feedback explains Local and Orion-Eridanus Bubble shapes.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"d581efe77f6945c7f2b4b21f33a915899254f2e2439273663fa93a20069b037f"},"source":{"id":"2604.27067","kind":"arxiv","version":2},"verdict":{"id":"8b122dfa-f97c-4519-a73e-e83bb9c0c781","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T17:04:30.414345Z","strongest_claim":"We find that feedback from the oldest co-spatial and co-moving relatives of these associations can explain the current morphologies of the Local and Orion-Eridanus Bubbles, along with the formation of related associations like Sco-Cen and Orion OB1.","one_line_summary":"Dynamical traceback of 16 low-mass associations shows most originated from larger complexes or feedback-driven bubbles, with one possibly from an intermediate-velocity cloud collision in Orion.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The dynamical traceback accurately reconstructs past formation sites without large errors from velocity uncertainties, incomplete membership, or unaccounted gravitational interactions (invoked throughout the traceback analysis described in the abstract).","pith_extraction_headline":"Dynamical traceback links low-mass associations to shared formation sites whose feedback explains Local and Orion-Eridanus Bubble shapes."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.27067/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_compliance","ran_at":"2026-05-19T19:36:17.825013Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"c0d32dc1af0bb5d6e4af1119d1f56f53f9e983f6aaa99f819ad97ecf24182f6c"},"references":{"count":3,"sample":[{"doi":"","year":null,"title":"\" * write output.state after.block = add.period write newline","work_id":"1504260c-aa52-462f-b8f7-4139a0d8fa4e","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"write newline","work_id":"927897d8-535d-410a-9cd3-bd25f995a94f","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1051/0004-6361:20053511","year":2017,"title":"AKt* H q, a ckD V JT h4)ܞ","work_id":"78235096-9373-4c63-82da-0bb342d694ea","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":3,"snapshot_sha256":"26a28f51b83cbf522bc60e787d498fd46c3232fcde9c3a493a7854767ceea99a","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"}