COSMOLOGICAL CONSTRAINTS FROM MEASUREMENTS OF TYPE Ia SUPERNOVAE DISCOVERED DURING THE FIRST 1.5 yr OF THE Pan-STARRS1 SURVEY

By Armin Rest, D. Scolnic, Ryan J. Foley, M. Huber, Ryan Chornock, G. Narayan, J. Tonry, E. Berger, A. Soderberg, C. Stubbs and 39 more. 2013

254 citations recorded by the source corpus.

We present grizP1 light curves of 146 spectroscopically confirmed Type Ia supernovae (SNe Ia; 0.03 < z < 0.65) discovered during the first 1.5 yr of the Pan-STARRS1 Medium Deep Survey. The Pan-STARRS1 natural photometric system is determined by a combination of on-site measurements of the instrument response function and observations of spectrophotometric standard stars. We find that the systematic uncertainties in the photometric system are currently 1.2% without accounting for the uncertainty in the Hubble Space Telescope Calspec definition of the AB system. A Hubble diagram is constructed with a subset of 113 out of 146 SNe Ia that pass our light curve quality cuts. The cosmological fit to 310 SNe Ia (113 PS1 SNe Ia + 222 light curves from 197 low-z SNe Ia), using only supernovae (SNe) and assuming a constant dark energy equation of state and flatness, yields . When combined with BAO+CMB(Planck)+H0, the analysis yields and including all identified systematics. The value of w is inconsistent with the cosmological constant value of −1 at the 2.3σ level. Tension endures after removing either the baryon acoustic oscillation (BAO) or the H0 constraint, though it is strongest when including the H0 constraint. If we include WMAP9 cosmic microwave background (CMB) constraints instead of those from Planck, we find , which diminishes the discord to <2σ. We cannot conclude whether the tension with flat ΛCDM is a feature of dark energy, new physics, or a combination of chance and systematic errors. The full Pan-STARRS1 SN sample with ∼three times as many SNe should provide more conclusive results.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/69f6a3084e62067803b6662f3a2013c7f655108a

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In Astronomy and Astrophysics

1. A. Filippenko
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4. E. Berger
5. Ryan Chornock
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Citations in the corpus

• The Data Release of the Sloan Digital Sky Survey-II Supernova Survey (2014, methodology): “…photometric identification represents an important example analysis for ongoing and future large surveys, such as PanSTARRS (Scolnic et al. 2013a; Rest et al. 2013), DES (Bernstein et al. 2012) and LSST (Tyson 2002), where full spectroscopic follow up of all active SN candidates will be…”
• On the Progenitors of Type Ia Supernovae (2018, unknown): “SNe Ia continue to be a key ingredient in the attempts to determine the equation of state (the ratio of pressure to density) of the “dark energy” that appears to propel the acceleration (e.g., Rest et al. 2014; Sullivan et al. 2011).”
• Planck2015 results (2015, unknown): “Since the submission of PCP13, first results from a sample of Type Ia SNe discovered with the Pan-STARRS survey have been reported by Rest et al. (2014) and Scolnic et al. (2014).”
• TOWARD CHARACTERIZATION OF THE TYPE IIP SUPERNOVA PROGENITOR POPULATION: A STATISTICAL SAMPLE OF LIGHT CURVES FROM Pan-STARRS1 (2014, methodology): “A summary of details of PS1 operations relevant to SN studies is given in Rest et al. (2013), and we discuss its key features here.”
• Correcting Type Ia Supernova Distances for Selection Biases and Contamination in Photometrically Identified Samples (2016, background): “Approximately 1000 spectroscopically confirmed SNe Ia (Conley et al. 2011; Betoule et al. 2014; Rest et al. 2014; Scolnic et al. 2014a) have been combined with measurements of the cosmic microwave background (Hinshaw et al. 2013; Planck Collaboration XVI 2014) to measure the dark energy equation of…”