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The Foundation Supernova Survey: Measuring Cosmological Parameters with Supernovae from a Single Telescope

Journal Article · · The Astrophysical Journal (Online)
 [1];  [2];  [3];  [4];  [2];  [5];  [6];  [3];  [7];  [5];  [6];  [7];  [8];  [3];  [9];  [10];  [11];  [12];  [4];  [6] more »;  [3];  [5];  [13];  [6];  [6];  [14];  [14];  [6];  [6];  [6] « less
  1. Univ. of California, Santa Cruz, CA (United States); University of Chicago
  2. Univ. of Chicago, IL (United States)
  3. Univ. of California, Santa Cruz, CA (United States)
  4. Space Telescope Science Inst., Baltimore, MD (United States); Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Physics and Astronomy
  5. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  6. Univ. of Hawaii, Honolulu, HI (United States)
  7. Rutgers Univ., Piscataway, NJ (United States)
  8. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Physics and Astronomy
  9. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States); Gordon and Betty Moore Foundation, Palo Alto, CA (United States)
  10. Villanova Univ., Villanova, PA (United States)
  11. Space Telescope Science Inst., Baltimore, MD (United States)
  12. Division of Theoretical Astronomy, National Astronomical Observatory of Japan (Japan); Academia Sinica, Taipei (Taiwan)
  13. Ohio Univ., Athens, OH (United States)
  14. Queen's Univ., Belfast, Northern Ireland (United Kingdom)
+ Show Author Affiliations
Measurements of the dark energy equation-of-state parameter, w, have been limited by uncertaintyin the selection effects and photometric calibration of $z <0.1$ Type Ia supernovae (SNe Ia). The Foundation Supernova Survey is designed to lower these uncertainties by creating a new sample of $z < 0.1$ SNe Ia observed on the Pan-STARRS system. Here, we combine the Foundation sample with SNe from the Pan-STRRS Medium Deep Survey and measure cosmological parameters with 1,338 SNe from a single telescope and a single, well-calibrated photometric system. For the firsttime, both the low-z and high-z data are predominantly discovered by surveys that do not target pre-selected galaxies, reducing selection bias uncertainties. The $z > 0.1$ data include 875 SNe without spectroscopic classifications and we show that we can robustly marginalize over CC SN contamination. We measure Foundation Hubble residuals to be fainter than the pre-existing low-z Hubble residualsby 0.046±0.027 mag (stat+sys). By combining the SN Ia data with cosmic microwave backgroundconstraints, we find w = -0.938±0.053, consistent with $$Λ$$CDM. With 463 spectroscopically classified SNe Ia alone, we measure w = -0.933±0.061. Using the more homogeneous and better-characterized Foundation sample gives a 55% reduction in the systematic uncertainty attributed to SN Ia sampleselection biases. Although use of just a single photometric system at low and high redshift increases the impact of photometric calibration uncertainties in this analysis, previous low-z samples may have correlated calibration uncertainties that were neglected in past studies. The full Foundation sample will observe up to 800 SNe to anchor the LSST and WFIRST Hubble diagrams.
Research Organization:
Univ. of Chicago, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
SC0009924
OSTI ID:
1593851
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 881; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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