{"paper":{"title":"Discovery of a Candidate Binary Supermassive Black Hole in a Periodic Quasar from Circumbinary Accretion Variability","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"Aaron Roodman, Alistair Walker, A. Miguel Holgado, Andr\\'es Plazas Malag\\'on, August Evrard, Aurelio Carnero Rosell, Ben Hoyle, Brenna Flaugher, Carlos Cunha, Chris D'Andrea, Christopher Davis, Daniel Gruen, David Brooks, David James, Devon L. Hollowood, Elisabeth Krause, Elizabeth Buckley-Geer, Emmanuel Bertin, Enrique Gaztanaga, Eric Morganson, Eric Suchyta, Eusebio Sanchez, Felipe Menanteau, Flavia Sobreira, Francisco Javier Castander, Gaston Gutierrez, Gregory Tarle, Hengxiao Guo, H. Thomas Diehl, James Annis, Jennifer Marshall, Jorge Carretero, Josh Frieman, Juan De Vicente, Juan Garcia-Bellido, Julia Gschwend, Karl Glazebrook, Keith Bechtol, Klaus Honscheid, Kyler Kuehn, Luiz da Costa, Manda Banerji, Marcelle Soares-Santos, Marcio Maia, Marcos Lima, Mathew Smith, Matias Carrasco Kind, Michael Schubnell, Molly Swanson, Pablo Fosalba, Paul Martini, Peter Doel, Ramon Miquel, R. Chris Smith, Richard G. McMahon, Richard Kessler, Robert Gruendl, Sahar Allam, Santiago Avila, Santiago Serrano, Shantanu Desai, Tamara Davis, The DES Collaboration, Tim Eifler, Vic Scarpine, Vinu Vikram, Wei-Ting Liao, Will Hartley, Xin Liu, Yu-Ching Chen, Yue Shen","submitted_at":"2020-08-27T18:17:59Z","abstract_excerpt":"Binary supermassive black holes (BSBHs) are expected to be a generic byproduct from hierarchical galaxy formation. The final coalescence of BSBHs is thought to be the loudest gravitational wave (GW) siren, yet no confirmed BSBH is known in the GW-dominated regime. While periodic quasars have been proposed as BSBH candidates, the physical origin of the periodicity has been largely uncertain. Here we report discovery of a periodicity (P=1607$\\pm$7 days) at 99.95% significance (with a global p-value of ~$10^{-3}$ accounting for the look elsewhere effect) in the optical light curves of a redshift "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.12317","kind":"arxiv","version":3},"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/2008.12317/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"}