{"paper":{"title":"A $1.9\\,M_{\\odot}$ neutron star candidate in a 2-year orbit","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Allyson Bieryla, David W. Latham, Hans-Walter Rix, Henrique Reggiani, Ilya V. Ilyin, Joshua D. Simon, Kareem El-Badry, Lars A. Buchhave, Puragra Guhathakurta, Sahar Shahaf, Sukanya Chakrabarti, Thomas M. Tauris, Tsevi Mazeh","submitted_at":"2024-02-09T19:00:01Z","abstract_excerpt":"We report discovery and characterization of a main-sequence G star orbiting a dark object with mass $1.90\\pm 0.04 M_{\\odot}$. The system was discovered via Gaia astrometry and has an orbital period of 731 days. We obtained multi-epoch RV follow-up over a period of 639 days, allowing us to refine the Gaia orbital solution and precisely constrain the masses of both components. The luminous star is a $\\gtrsim 12$ Gyr-old, low-metallicity halo star near the main-sequence turnoff ($T_{\\rm eff}\\approx 6000$ K; $\\log(g/\\left[{\\rm cm\\,s^{-2}}\\right])\\approx 4.0$; $\\rm [Fe/H]\\approx-1.25$; $M\\approx0.7"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2402.06722","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2402.06722/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"}