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Combined modelling of the light curves and radial velocities yield masses and radii for both white dwarfs without the need to assume mass-radius relations. We find that the primary white dwarf has a mass of M1 = 0.38(2) Msun and a radius of R1 = 0.0222(4) Rsun. The secondary white dwarf's mass and radius are M2 = 0.32(1) Msun and R2 = 0.0207(4) Rsun, and its temperature and surface gravity (T2 = 11678(313) K, log("},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1401.1503","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-01-07T21:00:09Z","cross_cats_sorted":[],"title_canon_sha256":"56e09e8aa9239b3260650f9a2f42c596b0def0adcd8344d6302da91ce4daf0ac","abstract_canon_sha256":"3019ece76f169369051b2a1e1e0a1b318ddedc3b31e724aeab522684c0f9e051"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:45:33.110949Z","signature_b64":"jw9hAIQcGkL8+T+HTtjRIyQKvkWe4XGeIBhaTMc0Ujnv+EOpSCb4YkxMHySFscRzU4E6FF5l4yLVkzWdgBfeBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3d7f035dc9931da2ab2d6b1a55cb677d0398a6094b4b35da9f4f36928d04e33e","last_reissued_at":"2026-05-18T01:45:33.110477Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:45:33.110477Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Precise parameters for both white dwarfs in the eclipsing binary CSS 41177","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Gianninas, B.T. G\\\"ansicke, C.M. Copperwheat, M.C.P. Bours, P.-E. Tremblay, S.G. Parsons, S.P. Littlefair, T.R. Marsh, V.S. Dhillon","submitted_at":"2014-01-07T21:00:09Z","abstract_excerpt":"We present ULTRACAM photometry and X-Shooter spectroscopy of the eclipsing double white dwarf binary CSS 41177, the only such system that is also a double-lined spectroscopic binary. Combined modelling of the light curves and radial velocities yield masses and radii for both white dwarfs without the need to assume mass-radius relations. We find that the primary white dwarf has a mass of M1 = 0.38(2) Msun and a radius of R1 = 0.0222(4) Rsun. The secondary white dwarf's mass and radius are M2 = 0.32(1) Msun and R2 = 0.0207(4) Rsun, and its temperature and surface gravity (T2 = 11678(313) K, log("},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.1503","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1401.1503","created_at":"2026-05-18T01:45:33.110553+00:00"},{"alias_kind":"arxiv_version","alias_value":"1401.1503v1","created_at":"2026-05-18T01:45:33.110553+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.1503","created_at":"2026-05-18T01:45:33.110553+00:00"},{"alias_kind":"pith_short_12","alias_value":"HV7QGXOJSMO2","created_at":"2026-05-18T12:28:30.664211+00:00"},{"alias_kind":"pith_short_16","alias_value":"HV7QGXOJSMO2FKZN","created_at":"2026-05-18T12:28:30.664211+00:00"},{"alias_kind":"pith_short_8","alias_value":"HV7QGXOJ","created_at":"2026-05-18T12:28:30.664211+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/HV7QGXOJSMO2FKZNNMNFLS3HPU","json":"https://pith.science/pith/HV7QGXOJSMO2FKZNNMNFLS3HPU.json","graph_json":"https://pith.science/api/pith-number/HV7QGXOJSMO2FKZNNMNFLS3HPU/graph.json","events_json":"https://pith.science/api/pith-number/HV7QGXOJSMO2FKZNNMNFLS3HPU/events.json","paper":"https://pith.science/paper/HV7QGXOJ"},"agent_actions":{"view_html":"https://pith.science/pith/HV7QGXOJSMO2FKZNNMNFLS3HPU","download_json":"https://pith.science/pith/HV7QGXOJSMO2FKZNNMNFLS3HPU.json","view_paper":"https://pith.science/paper/HV7QGXOJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1401.1503&json=true","fetch_graph":"https://pith.science/api/pith-number/HV7QGXOJSMO2FKZNNMNFLS3HPU/graph.json","fetch_events":"https://pith.science/api/pith-number/HV7QGXOJSMO2FKZNNMNFLS3HPU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/HV7QGXOJSMO2FKZNNMNFLS3HPU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/HV7QGXOJSMO2FKZNNMNFLS3HPU/action/storage_attestation","attest_author":"https://pith.science/pith/HV7QGXOJSMO2FKZNNMNFLS3HPU/action/author_attestation","sign_citation":"https://pith.science/pith/HV7QGXOJSMO2FKZNNMNFLS3HPU/action/citation_signature","submit_replication":"https://pith.science/pith/HV7QGXOJSMO2FKZNNMNFLS3HPU/action/replication_record"}},"created_at":"2026-05-18T01:45:33.110553+00:00","updated_at":"2026-05-18T01:45:33.110553+00:00"}