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The Complete Light-curve Sample of Spectroscopically Confirmed SNe Ia from Pan-STARRS1 and Cosmological Constraints from the Combined Pantheon Sample
- Source :
- The Astrophysical Journal, vol 859, iss 2, Astrophysical Journal, vol 859, iss 2, Astrophysical journal, 2018, Vol.859(2), pp.101 [Peer Reviewed Journal], Scolnic, DM; Jones, DO; Rest, A; Pan, YC; Chornock, R; Foley, RJ; et al.(2018). The Complete Light-curve Sample of Spectroscopically Confirmed SNe Ia from Pan-STARRS1 and Cosmological Constraints from the Combined Pantheon Sample. Astrophysical Journal, 859(2). doi: 10.3847/1538-4357/aab9bb. UC Santa Cruz: Retrieved from: http://www.escholarship.org/uc/item/84d0q763
- Publication Year :
- 2018
- Publisher :
- eScholarship, University of California, 2018.
-
Abstract
- 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 SN Ia ($0.03 < z < 0.68$) with useful distance estimates of SN Ia from SDSS, SNLS, various low-z and HST samples to form the largest combined sample of SN Ia consisting of a total of 1048 SN Ia ranging from $0.01 < z < 2.3$, which we call the `Pantheon Sample'. When combining Planck 2015 CMB measurements with the Pantheon SN sample, we find $��_m=0.307\pm0.012$ and $w = -1.026\pm0.041$ for the wCDM model. When the SN and CMB constraints are combined with constraints from BAO and local H0 measurements, the analysis yields the most precise measurement of dark energy to date: $w0 = -1.007\pm 0.089$ and $wa = -0.222 \pm0.407$ for the w0waCDM model. Tension with a cosmological constant previously seen in an analysis of PS1 and low-z SNe has diminished after an increase of $2\times$ in the statistics of the PS1 sample, improved calibration and photometry, and stricter light-curve quality cuts. We find 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 SN Ia to measure dark energy.<br />Accepted by ApJ. Data can be found here: http://dx.DOI.org/10.17909/T95Q4X
- Subjects :
- Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cosmic microwave background
FOS: Physical sciences
Cosmological constant
Astrophysics
Astronomy & Astrophysics
Physical Chemistry
01 natural sciences
Atomic
Photometry (optics)
symbols.namesake
Particle and Plasma Physics
supernovae: general
0103 physical sciences
Nuclear
Planck
dark energy
010303 astronomy & astrophysics
Physics
010308 nuclear & particles physics
Molecular
Astronomy and Astrophysics
Light curve
Redshift
observations [cosmology]
cosmology: observations
Supernova
Space and Planetary Science
Dark energy
symbols
astro-ph.CO
general [supernovae]
Astronomical and Space Sciences
Astrophysics - Cosmology and Nongalactic Astrophysics
Physical Chemistry (incl. Structural)
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal, vol 859, iss 2, Astrophysical Journal, vol 859, iss 2, Astrophysical journal, 2018, Vol.859(2), pp.101 [Peer Reviewed Journal], Scolnic, DM; Jones, DO; Rest, A; Pan, YC; Chornock, R; Foley, RJ; et al.(2018). The Complete Light-curve Sample of Spectroscopically Confirmed SNe Ia from Pan-STARRS1 and Cosmological Constraints from the Combined Pantheon Sample. Astrophysical Journal, 859(2). doi: 10.3847/1538-4357/aab9bb. UC Santa Cruz: Retrieved from: http://www.escholarship.org/uc/item/84d0q763
- Accession number :
- edsair.doi.dedup.....d8d531fd16999614946f687d549835ac