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New times of minima ... indicate the presence of a low mass star ∼0.3 M⊙ in an orbit separated by a few AU from the close binary."},{"attestation":"unclaimed","claim_id":"C2","kind":"weakest_assumption","source":"verdict.weakest_assumption","status":"machine_extracted","text":"That reliable physical parameters can be extracted despite only shallow eclipses and sinusoidal light variations that are merely suggestive of a near-contact configuration, as stated in the abstract."},{"attestation":"unclaimed","claim_id":"C3","kind":"one_line_summary","source":"verdict.one_line_summary","status":"machine_extracted","text":"V486 Car is a near-contact binary with component masses 2.1 and 0.4 solar masses, radii 3.2 and 1.48 solar radii, temperatures 10000 K and 6200 K, plus evidence for a ~0.3 solar mass companion at a few AU."},{"attestation":"unclaimed","claim_id":"C4","kind":"headline","source":"verdict.pith_extraction.headline","status":"machine_extracted","text":"V486 Car is a near-contact binary with masses 2.1 and 0.4 solar masses plus a possible 0.3 solar-mass companion a few AU away."}],"snapshot_sha256":"9c92dd155dd92f04daa8979c7c498068c1ccff69aef95371086dbbca91d5ca03"},"formal_canon":{"evidence_count":2,"snapshot_sha256":"e84266a4efa5b7a5c98af9b390373b8e26d3c0b60d469b61a94bdca275043554"},"paper":{"abstract_excerpt":"The hitherto neglected close binary V486 Car is studied with the aid of newly applied satellite photometry (HIPPARCOS and TESS), high dispersion spectrometry (HERCULES) and ground-based B and V photometry. While the sinusoidal light variations are suggestive of a near-contact system, the stars have only shallow eclipse, so highly confident parametrization becomes challenging. We find: $M_1 = 2.1 \\pm 0.1$, $M_2 = 0.4 \\pm 0.1$; $R_1 = 3.20 \\pm 0.02$, $R_2 = 1.48 \\pm 0.01$; (${\\odot}$); $T_{e1} = 10000 \\pm 500$, $T_{e2} = 6200 \\pm 200$ (K); distance = 162 $\\pm$ 12 (pc). New times of minima for V4","authors_text":"Ahmet Erdem, Burcu Ozkardes, Edwin Budding, Mark G. Blackford, Michael D. Rhodes, Timothy S. Banks, Tom Love, Volkan Bakis","cross_cats":[],"headline":"V486 Car is a near-contact binary with masses 2.1 and 0.4 solar masses plus a possible 0.3 solar-mass companion a few AU away.","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-05-14T00:06:57Z","title":"The Close Binary V486 Carinae"},"references":{"count":96,"internal_anchors":3,"resolved_work":96,"sample":[{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":3,"title":"Data reduction and error analysis for the physical sciences","work_id":"2a1f8768-b6f3-4980-bc86-18d8c90aff0b","year":null},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":4,"title":"American Astronomical Society Meeting Abstracts , year = 2002, series =","work_id":"637ac893-5c9a-464d-b829-da6a9e650bda","year":2002},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":5,"title":"A Guide to Close Binary Systems , author=. 2022 , publisher=","work_id":"2806290b-387e-4867-82fa-7e526fed8233","year":2022},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":6,"title":"Introduction to Astronomical Photometry , author=. 2007 , publisher=","work_id":"22b5ab96-58cb-4c6a-8345-a614a9e7e9a5","year":2007},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":8,"title":"Ellipsoidal figures of equilibrium","work_id":"73ac9b1c-cb5a-4433-ae43-5aed7b53abf9","year":null}],"snapshot_sha256":"251f64ea7e39a51752f329e84d3d99893fe807bc3aac1d8f1db014c2893e8d70"},"source":{"id":"2605.14208","kind":"arxiv","version":1},"verdict":{"created_at":"2026-05-15T02:52:51.627705Z","id":"50b1b3b2-44ee-4142-bed2-739b73d4f08e","model_set":{"reader":"grok-4.3"},"one_line_summary":"V486 Car is a near-contact binary with component masses 2.1 and 0.4 solar masses, radii 3.2 and 1.48 solar radii, temperatures 10000 K and 6200 K, plus evidence for a ~0.3 solar mass companion at a few AU.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"V486 Car is a near-contact binary with masses 2.1 and 0.4 solar masses plus a possible 0.3 solar-mass companion a few AU away.","strongest_claim":"We find: M1 = 2.1 ± 0.1, M2 = 0.4 ± 0.1; R1 = 3.20 ± 0.02, R2 = 1.48 ± 0.01; (⊙); Te1 = 10000 ± 500, Te2 = 6200 ± 200 (K); distance = 162 ± 12 (pc). New times of minima ... indicate the presence of a low mass star ∼0.3 M⊙ in an orbit separated by a few AU from the close binary.","weakest_assumption":"That reliable physical parameters can be extracted despite only shallow eclipses and sinusoidal light variations that are merely suggestive of a near-contact configuration, as stated in the abstract."}},"verdict_id":"50b1b3b2-44ee-4142-bed2-739b73d4f08e"}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:470fe5fc3d9194e13381aa6c350562b6cfd3b8bb78beacffdc7f54f6183cb702","target":"record","created_at":"2026-05-17T23:39:10Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"7b8930f60a22ffb312ec7e5d35867dbacc23bbf65a3d0dcd789cd0dc9a7cbd64","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-05-14T00:06:57Z","title_canon_sha256":"58b38e150666bfb2d44a5cc1842204c94b07fe73687d88d3e4210eae7622aa38"},"schema_version":"1.0","source":{"id":"2605.14208","kind":"arxiv","version":1}},"canonical_sha256":"80ecbef6e692e7acd42f85f00d4b48fd4762848d74c0e0bd6fd3d290337c0187","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"80ecbef6e692e7acd42f85f00d4b48fd4762848d74c0e0bd6fd3d290337c0187","first_computed_at":"2026-05-17T23:39:10.957761Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:39:10.957761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"V3ipdSBKHV72fsGEzv9jFRw/VUoXaKvCMwzQTDgt5ovGYIqmcaXVpDrW+BDbCI8ZPNtFaGNE3Ue1dSPsRBMIDg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:39:10.958244Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.14208","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:470fe5fc3d9194e13381aa6c350562b6cfd3b8bb78beacffdc7f54f6183cb702","sha256:0b5b3b21c74c59d916c3c0c3991424bd6635f1cee7154070346cdac77db599b1"],"state_sha256":"3da3021a33056046aaad06d7a763e7cd374a614e08bce7abac48ec009992a0a5"}