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The Dark Energy Survey Supernova Program: Cosmological Analysis and Systematic Uncertainties

Journal Article · · The Astrophysical Journal
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  1. Duke U.
  2. Boston U.; Harvard-Smithsonian Ctr. Astrophys.
  3. Australian Natl. U., Canberra
  4. IP2I, Lyon
  5. UPenn, Philadelphia
  6. Queensland U.
  7. ARC, Canberra; Australian Natl. U., Canberra (main); Australian Natl. U., Canberra
  8. Portsmouth U., ICG
  9. Chicago U., Astron. Astrophys. Ctr.; Chicago U., KICP
  10. Swinburne U. Tech., Hawthorn
  11. Marseille, CPPM
  12. Southampton U.
  13. Madrid U.
  14. African Inst. Math. Sci., Cape Town; South African Astron. Observ.
  15. Trieste Observ.
  16. UC, Santa Cruz
  17. Barcelona, IEEC
  18. Argonne (main)
  19. Macquarie Univ., NSW (Australia); Lowell Observatory, Flagstaff, AZ (United States)
  20. U. Surrey (main)
  21. Baylor U.; Duke U.
  22. Fermilab
  23. Cerro-Tololo InterAmerican Obs.
  24. LIneA, Rio de Janeiro
  25. U. Michigan, Ann Arbor
  26. Wisconsin U., Madison
  27. University Coll. London
  28. KIPAC, Menlo Park; SLAC
  29. IAC, La Laguna; LIneA, Rio de Janeiro; Laguna U., Tenerife
  30. Barcelona, IFAE
  31. Jodrell Bank; Nottingham U.
  32. Hamburg Observ.
  33. Indian Inst. Tech., Hyderabad
  34. Inst. Theor. Astrophys., Oslo
  35. NCSA, Urbana
  36. Fermilab; Chicago U., KICP
  37. Madrid, IFT
  38. Barcelona, IFAE; Chicago U., KICP
  39. Munich U.
  40. NCSA, Urbana; Illinois U., Urbana, Astron. Dept.
  41. Ohio State U., CCAPP; Ohio State U.
  42. Harvard-Smithsonian Ctr. Astrophys.
  43. Caltech, JPL
  44. Texas A-M
  45. LPSC, Grenoble
  46. ICREA, Barcelona; Barcelona, Autonoma U.; Barcelona, IFAE
  47. Carnegie Mellon U.
  48. LIneA, Rio de Janeiro; Rio de Janeiro Observ.
  49. Ruhr U., Bochum
  50. Sussex U.
  51. Madrid, CIEMAT
  52. ORNL, Oak Ridge (main)
  53. Ohio State U., CCAPP
  54. U. Michigan, Ann Arbor; LBNL, Berkeley
+ Show Author Affiliations
We present the full Hubble diagram of photometrically classified Type Ia supernovae (SNe Ia) from the Dark Energy Survey supernova program (DES-SN). DES-SN discovered more than 20,000 SN candidates and obtained spectroscopic redshifts of 7000 host galaxies. Based on the light-curve quality, we select 1635 photometrically identified SNe Ia with spectroscopic redshift 0.10 < z < 1.13, which is the largest sample of supernovae from any single survey and increases the number of known z > 0.5 supernovae by a factor of 5. In a companion paper, we present cosmological results of the DES-SN sample combined with 194 spectroscopically classified SNe Ia at low redshift as an anchor for cosmological fits. Here we present extensive modeling of this combined sample and validate the entire analysis pipeline used to derive distances. We show that the statistical and systematic uncertainties on cosmological parameters are $${\sigma }_{{{\rm{\Omega }}}_{M},\mathrm{stat}+\mathrm{sys}}^{{\rm{\Lambda }}\mathrm{CDM}}=$$ 0.017 in a flat ΛCDM model, and $$({\sigma }_{{{\rm{\Omega }}}_{M}},{\sigma }_{w}{)}_{\mathrm{stat}+\mathrm{sys}}^{w\mathrm{CDM}}$$ = (0.082, 0.152) in a flat wCDM model. Combining the DES SN data with the highly complementary cosmic microwave background measurements by Planck Collaboration reduces by a factor of 4 uncertainties on cosmological parameters. In all cases, statistical uncertainties dominate over systematics. We show that uncertainties due to photometric classification make up less than 10% of the total systematic uncertainty budget. This result sets the stage for the next generation of SN cosmology surveys such as the Vera C. Rubin Observatory's Legacy Survey of Space and Time.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
89243024CSC000002; AC02-07CH11359; AC05-00OR22725; SC0009924; SC0019193
OSTI ID:
3007412
Alternate ID(s):
OSTI ID: 2481171
OSTI ID: 2282565
Report Number(s):
FERMILAB-PUB--23-693-PPD
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 975; ISSN 0004-637X; ISSN 1538-4357
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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79 ASTRONOMY AND ASTROPHYSICS
Type Ia supernovae
cosmological constant experiments
cosmological parameters
dark energy