{"paper":{"title":"A Validated Low-to-Intermediate Mass Planetary Interior Structure Model and New Mass-Radius Relations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"A new planetary interior model reproduces solar system radii to within 1 percent and supplies updated mass-radius curves for exoplanets of different compositions.","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Bennett Neil Skinner, Ralph E. Pudritz, Ryan Cloutier","submitted_at":"2026-04-16T17:59:02Z","abstract_excerpt":"The increasing precision of planetary mass and radius observations is bringing major questions about the structure and formation of planets--such as the nature of the radius valley and origin of super-Mercuries--within reach, demanding the development of interior structure models with more physics to more accurately determine planetary radii for a given composition. Here, we present a new model that includes state-of-the-art equations of state following the latest experimental and computational results, a physically-motivated mineralogy allowing multiple species to coexist within planetary lay"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"This model replicates Earth's radius and moment of inertia coefficient to within 0.2%, Mars and the Moon's to within 0.5%, and Mercury, Venus, and Europa's to within 1% or 3σ.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The mineralogy and equations of state calibrated on solar-system bodies and lab data remain accurate when extrapolated to arbitrary compositions, pressures, and temperatures encountered in exoplanets of different formation histories.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A validated interior model with advanced physics produces updated mass-radius relations for low-to-intermediate mass planets that differ from prior relations especially at high and low stellar irradiation.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A new planetary interior model reproduces solar system radii to within 1 percent and supplies updated mass-radius curves for exoplanets of different compositions.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"c08185ed14d28cf7ddfd7670e581d225c39f744bd4d3fca81c7bdf9c64e96473"},"source":{"id":"2604.15304","kind":"arxiv","version":2},"verdict":{"id":"a4f21ce3-7643-4555-9003-25c3616115f9","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T09:36:24.557521Z","strongest_claim":"This model replicates Earth's radius and moment of inertia coefficient to within 0.2%, Mars and the Moon's to within 0.5%, and Mercury, Venus, and Europa's to within 1% or 3σ.","one_line_summary":"A validated interior model with advanced physics produces updated mass-radius relations for low-to-intermediate mass planets that differ from prior relations especially at high and low stellar irradiation.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The mineralogy and equations of state calibrated on solar-system bodies and lab data remain accurate when extrapolated to arbitrary compositions, pressures, and temperatures encountered in exoplanets of different formation histories.","pith_extraction_headline":"A new planetary interior model reproduces solar system radii to within 1 percent and supplies updated mass-radius curves for exoplanets of different compositions."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.15304/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"}