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The Pantheon+ Analysis: Cosmological Constraints

Journal Article · · The Astrophysical Journal
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  1. Harvard & Smithsonian, Cambridge, MA (United States); UChicago
  2. Duke Univ., Durham, NC (United States)
  3. Space Telescope Science Inst., Baltimore, MD (United States); Johns Hopkins Univ., Baltimore, MD (United States)
  4. Univ. of Queensland, Brisbane, QLD (Australia)
  5. Univ. of Edinburgh (United Kingdom)
  6. Univ. of Chicago, IL (United States)
  7. Univ. of California, Santa Cruz, CA (United States)
  8. Johns Hopkins Univ., Baltimore, MD (United States)
  9. Australian National Univ., Canberra, ACT (Australia)
  10. Ume Univ. (Sweden)
  11. Univ. of California, Berkeley, CA (United States)
  12. Univ. of Pennsylvania, Philadelphia, PA (United States)
  13. Harvard & Smithsonian, Cambridge, MA (United States); Harvard Univ., Cambridge, MA (United States)
  14. Univ. of Notre Dame, IN (United States)
  15. Texas A & M Univ., College Station, TX (United States); George P. and Cynthia Woods Mitchell Institute for Fundamental Physics & Astronomy, College Station, TX (United States)
  16. Univ. of Hawaii, Honolulu, HI (United States)
  17. Univ. of Dublin (Ireland)
  18. Rutgers Univ., Piscataway, NJ (United States)
  19. Univ. of Portsmouth (United Kingdom)
  20. Harvard & Smithsonian, Cambridge, MA (United States); Gordon and Betty Moore Foundation, Palo Alto, CA (United States)
  21. Swinburne Univ. of Technology, Victoria (Australia); Univ. Clermont Auvergne, Clermont-Ferrand (France)
  22. Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
  23. Univ. College London (United Kingdom)
  24. National Central Univ., Jhongli (Taiwan)
  25. Space Telescope Science Inst., Baltimore, MD (United States)
  26. Univ. de Lyon, Villeurbanne (France)
  27. Univ. of Southampton (United Kingdom)
+ Show Author Affiliations
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves of 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift from z = 0.001 to 2.26. This work features an increased sample size from the addition of multiple cross-calibrated photometric systems of SNe covering an increased redshift span, and improved treatments of systematic uncertainties in comparison to the original Pantheon analysis, which together result in a factor of 2 improvement in cosmological constraining power. For a flat ΛCDM model, we find ΩM = 0.334 ± 0.018 from SNe Ia alone. For a flat w0CDM model, we measure w0 = –0.90 ± 0.14 from SNe Ia alone, H0 = 73.5 ± 1.1 km s–1 Mpc–1 when including the Cepheid host distances and covariance (SH0ES), and w0 = $$-{0.978}_{-0.031}^{+0.024}$$ when combining the SN likelihood with Planck constraints from the cosmic microwave background (CMB) and baryon acoustic oscillations (BAO); both w0 values are consistent with a cosmological constant. We also present the most precise measurements to date on the evolution of dark energy in a flat w0waCDM universe, and measure wa = $$-{0.1}_{-2.0}^{+0.9}$$ from Pantheon+ SNe Ia alone, H0 = 73.3 ± 1.1 km s–1 Mpc–1 when including SH0ES Cepheid distances, and wa = $$-{0.65}_{-0.32}^{+0.28}$$ when combining Pantheon+ SNe Ia with CMB and BAO data. Finally, we find that systematic uncertainties in the use of SNe Ia along the distance ladder comprise less than one-third of the total uncertainty in the measurement of H0 and cannot explain the present "Hubble tension" between local measurements and early universe predictions from the cosmological model.
Research Organization:
Univ. of Chicago, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0009924
OSTI ID:
1902943
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 938; ISSN 0004-637X
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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