{"paper":{"title":"The NANOGrav 15 yr Data Set: Impacts of Customized Chromatic Noise Models on Gravitational Wave Analyses","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.CO","authors_text":"Aaron D. Johnson, Abhimanyu Susobhanan, Adam Brazier, Aiden Gundersen, Akash Anumarlapudi, Alessandra Amosso, Alexander McEwen, Alexander Saffer, Anala K. Sreekumar, Andrea Mitridate, Anjana Ashok, Anne M. Archibald, Ann Schmiedekamp, Ashley Martsen, Bence Becsy, Benetge B. P. Perera, Bjorn Larsen, Bradley W. Meyers, Brent J. Shapiro-Albert, Caitlin A. Witt, Carl Schmiedekamp, Cayenne Matt, Cherry Ng, Chiara M. F. Mingarelli, Chung-Pei Ma, C. J. Harris, Daniel J. Oliver, Daniel R. Stinebring, David J. Nice, David L. Kaplan, David Wright, Deborah C. Good, Doa Hashemi Asl, Duncan R. Lorimer, Dustin R. Madison, Elizabeth C. Ferrara, Emiko C. Gardiner, Emmanuel Fonseca, Fronefield Crawford, Gabriel E. Freedman, Gabriella Agazie, Graham M. Doskoch, Haley M. Wahl, Heling Deng, Henri A. Radovan, H. Thankful Cromartie, Ingrid H. Stairs, Jacob E. Turner, Jacob Taylor, James M. Cordes, James W. McKee, J. Andrew Casey-Clyde, Jeffrey S. Hazboun, Jeremy G. Baier, Jessie C. Runnoe, Jing Luo, Joey S. Key, Joris P. W. Verbiest, Joseph D. Romano, Joseph Glaser, Joseph K. Swiggum, Joseph Simon, Kai Schmitz, Kalista Wayt, Kathryn Crowter, Kayhan Gultekin, Ken D. Olum, Kevin P. Wilson, Kevin Stovall, Kyle A. Gersbach, Lankeswar Dey, Laura Blecha, Levi Schult, Luke Zoltan Kelley, Maria Charisi, Matthew Kerr, Matthew T. Miles, Maura A. McLaughlin, Megan E. DeCesar, Megan L. Jones, Mercedes S. Thompson, Michael T. Lam, Michele Vallisneri, Natalia Lewandowska, Natasha McMann, Nate Garver-Daniels, Neil J. Cornish, Nihan S. Pol, Nikita Agarwal, Nima Laal, Olivia Young, Patrick M. Meyers, Paul B. Demorest, Paul R. Brook, Paul S. Ray, Paul T. Baker, Peter A. Gentile, Polina Petrov, Rand Burnette, Robin Case, Robin Strahler, Ross J. Jennings, Rutger van Haasteren, Ryan S. Lynch, Sarah Burke-Spolaor, Sarah J. Vigeland, Scott M. Ransom, Shami Chatterjee, Shania Nichols, Shashwat C. Sardesai, Sophia V. Sosa Fiscella, Stella K. Ocker, Stephen R. Taylor, Timothy Dolch, Timothy T. Pennucci, Tingting Liu, T. Joseph W. Lazio, Tyler Cohen, William Fiore, William G. Lamb, Xavier Siemens, Yu-Ting Chang, Zaven Arzoumanian","submitted_at":"2026-06-26T19:14:32Z","abstract_excerpt":"We report updated nHz gravitational wave (GW) significance, characterization, and interpretations using the customized chromatic-noise models (CNMs) developed in Larsen, Baier et al. (2026). for the NANOGrav 15-year data set. We find increased evidence for the Hellings-Downs (HD) correlation signature of the stochastic gravitational wave background (GWB), with a Bayes factor of $1571\\pm14$ for HD-correlations over a common uncorrelated red-noise process using a power-law model with $14$ Fourier modes. We find this $\\sim8\\times$ increase in Bayes factor from Agazie et al. (2023a) is a result of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.28554","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.28554/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"}