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Title: The Complete Light-curve Sample of Spectroscopically Confirmed SNe Ia from Pan-STARRS1 and Cosmological Constraints from the Combined Pantheon Sample

Here, we present optical light curves, redshifts, and classifications for 365 spectroscopically confirmed Type Ia supernovae (SNe Ia) discovered by the Pan-STARRS1 (PS1) Medium Deep Survey. We detail improvements to the PS1 SN photometry, astrometry, and calibration that reduce the systematic uncertainties in the PS1 SN Ia distances. We combine the subset of 279 PS1 SNe Ia (0.03 < z < 0.68) with useful distance estimates of SNe Ia from the Sloan Digital Sky Survey (SDSS), SNLS, and various low-z and Hubble Space Telescope samples to form the largest combined sample of SNe Ia, consisting of a total of 1048 SNe Ia in the range of 0.01 < z < 2.3, which we call the Pantheon Sample. When combining Planck 2015 cosmic microwave background (CMB) measurements with the Pantheon SN sample, we find Ω m = 0.307 ± 0.012 and w = -1.026 ± 0.041 for the wCDM model. When the SN and CMB constraints are combined with constraints from BAO and local H 0 measurements, the analysis yields the most precise measurement of dark energy to date: w 0 = -1.007 ± 0.089 and w α = -0.222 ± 0.407 for the w 0w α CDM model. Tension withmore » a cosmological constant previously seen in an analysis of PS1 and low-z SNe has diminished after an increase of 2× in the statistics of the PS1 sample, improved calibration and photometry, and stricter light-curve quality cuts. We find that the systematic uncertainties in our measurements of dark energy are almost as large as the statistical uncertainties, primarily due to limitations of modeling the low-redshift sample. This must be addressed for future progress in using SNe Ia to measure dark energy.« less
Authors:
 [1] ; ORCiD logo [2] ;  [3] ;  [4] ;  [5] ;  [4] ;  [6] ; ORCiD logo [1] ; ORCiD logo [7] ;  [8] ; ORCiD logo [9] ; ORCiD logo [10] ;  [11] ;  [10] ;  [12] ; ORCiD logo [13] ; ORCiD logo [14] ;  [10] ;  [15] ; ORCiD logo [16] more »; ORCiD logo [17] ; ORCiD logo [18] ; ORCiD logo [6] ; ORCiD logo [19] ;  [20] ;  [19] ;  [21] ; ORCiD logo [22] ; ORCiD logo [6] ; ORCiD logo [23] ; ORCiD logo [6] ; ORCiD logo [6] ;  [6] ; ORCiD logo [6] ; ORCiD logo [23] ;  [6] ;  [17] ; ORCiD logo [17] ;  [17] ;  [17] « less
  1. The Univ. of Chicago, Chicago, IL (United States)
  2. Johns Hopkins Univ., Baltimore, MD (United States)
  3. Johns Hopkins Univ., Baltimore, MD (United States); Space Telescope Science Institute, Baltimore, MD (United States)
  4. Univ. of California, Santa Cruz, CA (United States)
  5. Ohio Univ., Athens, OH (United States)
  6. Univ. of Hawaii, Honolulu, HI (United States)
  7. Space Telescope Science Institute, Baltimore, MD (United States)
  8. Space Telescope Science Institute, Baltimore, MD (United States); Johns Hopkins Univ., Baltimore, MD (United States)
  9. Univ. of South Carolina, Columbia, SC (United States)
  10. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  11. Univ. of Pennsylvania, Philadelphia, PA (United States)
  12. The Observatories of the Carnegie Institution for Science, Pasadena, CA (United States)
  13. Harvard Univ., Cambridge, MA (United States)
  14. Stockholm Univ., Stockholm (Sweden)
  15. Private Researcher
  16. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  17. Queens Univ. Belfast, Belfast (United Kingdom)
  18. Harvard Univ., Cambridge, MA (United States); Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  19. Univ. of Pittsburgh, Pittsburgh, PA (United States)
  20. Univ. of Notre Dame, Notre Dame, IN (United States)
  21. Villanova Univ., Villanova, PA (United States)
  22. GMTO Corp., Pasadena, CA (United States)
  23. Univ. of Durham Science Labs., Durham (United Kingdom)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 859; Journal Issue: 2; Related Information: © 2018 2018. The American Astronomical Society. All rights reserved.; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmology: observations; dark energy; supernovae: general
OSTI Identifier:
1461165