articleThe Astrophysical JournalJun 20, 2025GOLD OA

Union through UNITY: Cosmology with 2000 SNe Using a Unified Bayesian Framework

DRD. RubinGAG. AlderingMBM. BetouleAFAndy FruchterXHXiaosheng Huang

University of Hawaiʻi at Mānoa · Lawrence Berkeley National Laboratory · +11 more institutions

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Abstract

Abstract Type Ia supernovae (SNe Ia) were instrumental in establishing the acceleration of the Universe’s expansion. By virtue of their combination of distance reach, precision, and prevalence, they continue to provide key cosmological constraints, complementing other cosmological probes. Individual SN surveys cover only over about a factor of 2 in redshift, so compilations of multiple SN data sets are strongly beneficial. We assemble an up-to-date “Union” compilation of 2087 cosmologically useful SNe Ia from 24 data sets (“Union3”). We take care to put all SNe on the same distance scale and update the light-curve fitting with SALT3 to use the full rest-frame optical. Over the next few years, the number of…

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Topics & keywords

Topics
Keywords
  • Cosmology
  • Bayesian probability
  • Theoretical physics
  • Physics
  • Computer science
  • Astronomy
  • Artificial intelligence
UN Sustainable Development Goals
  • Climate action
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