{"paper":{"title":"Equilibrium figure of Haumea and possible detection by stellar occultation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Haumea's observed shape matches hydrostatic models near critical rotation that pinch and deviate up to 110 km from an ellipsoid.","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"C. Staelen, F. Chambat, J. C. Castillo-Rogez, N. Rambaux","submitted_at":"2026-03-12T10:50:44Z","abstract_excerpt":"The equilibrium figure of dwarf planet Haumea is studied to determine if the observed shape is compatible with a differentiated hydrostatic body. Three groups of interior models of Haumea are assumed, all with a rocky core and a volatile-rich outer shell that may contain some porosity. A third layer located between the core and the outer shell has a density suggesting partial differentiation or the presence of a large fraction of organic matter. Using the code BALEINES, which solves for the equilibrium figures of the boundaries between layers, we show that the hydrostatic models closest to the"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Using the code BALEINES, which solves for the equilibrium figures of the boundaries between layers, we show that the hydrostatic models closest to the shape derived by stellar occultation approach a state of critical rotation, which translates into a pinched shape with large deviations from an ellipsoid (up to 110 km).","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The assumption of three specific interior model groups with a rocky core, an intermediate layer of suggested partial differentiation or organic matter, and a volatile-rich outer shell possibly containing porosity, combined with the premise that Haumea is in hydrostatic equilibrium.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Hydrostatic equilibrium models of Haumea with layered interiors predict a pinched shape deviating up to 110 km from an ellipsoid, potentially detectable in the 2026 occultation.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Haumea's observed shape matches hydrostatic models near critical rotation that pinch and deviate up to 110 km from an ellipsoid.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"550bc5355a295bbae1db57170684b9f20a9bd76d4549825f69c737c6f8111a43"},"source":{"id":"2603.11787","kind":"arxiv","version":2},"verdict":{"id":"43aaeb8d-19cb-42cf-8a50-6a99df44ad68","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T12:22:06.288804Z","strongest_claim":"Using the code BALEINES, which solves for the equilibrium figures of the boundaries between layers, we show that the hydrostatic models closest to the shape derived by stellar occultation approach a state of critical rotation, which translates into a pinched shape with large deviations from an ellipsoid (up to 110 km).","one_line_summary":"Hydrostatic equilibrium models of Haumea with layered interiors predict a pinched shape deviating up to 110 km from an ellipsoid, potentially detectable in the 2026 occultation.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The assumption of three specific interior model groups with a rocky core, an intermediate layer of suggested partial differentiation or organic matter, and a volatile-rich outer shell possibly containing porosity, combined with the premise that Haumea is in hydrostatic equilibrium.","pith_extraction_headline":"Haumea's observed shape matches hydrostatic models near critical rotation that pinch and deviate up to 110 km from an ellipsoid."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2603.11787/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":23,"sample":[{"doi":"","year":2024,"title":"2024, Nature Communications, 15, 6202","work_id":"26d121f4-510c-49b2-b6fb-1574e60149db","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2016,"title":"Barr, A. C. & Schwamb, M. E. 2016, MNRAS, 460, 1542 Brozovi´c, M. & Jacobson, R. A. 2024, AJ, 167, 256","work_id":"57034324-dda6-4380-aa17-6d087d26d6a3","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2023,"title":"2023, Journal of Geophys- ical Research: Planets, 128, e2022JE007432","work_id":"21ba915a-1fb2-4081-bed6-ef1a9d89a238","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2023,"title":"2023, A&A, 675, L2","work_id":"83d9f2b6-95b4-455f-9421-0689986fa884","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2019,"title":"Dunham, E. T., Desch, S. J., & Probst, L. 2019, ApJ, 877, 41","work_id":"bb39b336-b0da-4e2e-8e18-7705ce0d1216","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":23,"snapshot_sha256":"c09e298743eee67462c04a599b33c1dffc4223acab73c4fb0d2c28d00834842c","internal_anchors":0},"formal_canon":{"evidence_count":1,"snapshot_sha256":"e0e5f03eda1e26117076c35ef23ccf2cfbda24f629d82c83bc83cef53195b88e"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}