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Systematic Uncertainties Associated with the Cosmological Analysis of the First Pan-STARRS1 Type Ia Supernova Sample

Scolnic, D.; Rest, A.; Riess, A.; Huber, M.E.; Foley, R.J.; Brout, D.; Chornock, R.; Narayan, G.; Tonry, J.L.; Berger, E.; Soderberg, A.M.; Stubbs, C.W.; Kirshner, R.P.; Rodney, S.; Smartt, S.J.; Schlafly, E.; Botticella, M.T.; Challis, P.; Czekala, I.; Drout, M.; Hudson, M.J.; Kotak, R.; Leibler, C.; Lunnan, R.; Marion, G.H.; McCrum, M.; Milisavljevic, D.; Pastorello, A.; Sanders, N.E.; Smith, K.; Stafford, E.; Thilker, D.; Valenti, S.; Wood-Vasey, W.M.; Zheng, Z.; Burgett, W.S.; Chambers, K.C.; Denneau, L.; Draper, P.W.; Flewelling, H.; Hodapp, K.W.; Kaiser, N.; Kudritzki, R.-P.; Magnier, E.A.; Metcalfe, N.; Price, P.A.; Sweeney, W.; Wainscoat, R.; Waters, C.

Systematic Uncertainties Associated with the Cosmological Analysis of the First Pan-STARRS1 Type Ia Supernova Sample Thumbnail


D. Scolnic

A. Rest

A. Riess

M.E. Huber

R.J. Foley

D. Brout

R. Chornock

G. Narayan

J.L. Tonry

E. Berger

A.M. Soderberg

C.W. Stubbs

R.P. Kirshner

S. Rodney

S.J. Smartt

E. Schlafly

M.T. Botticella

P. Challis

I. Czekala

M. Drout

M.J. Hudson

R. Kotak

C. Leibler

R. Lunnan

G.H. Marion

M. McCrum

D. Milisavljevic

A. Pastorello

N.E. Sanders

K. Smith

E. Stafford

D. Thilker

S. Valenti

W.M. Wood-Vasey

Z. Zheng

W.S. Burgett

K.C. Chambers

L. Denneau

H. Flewelling

K.W. Hodapp

N. Kaiser

R.-P. Kudritzki

E.A. Magnier

P.A. Price

W. Sweeney

R. Wainscoat

C. Waters


We probe the systematic uncertainties from the 113 Type Ia supernovae (SN Ia) in the Pan-STARRS1 (PS1) sample along with 197 SN Ia from a combination of low-redshift surveys. The companion paper by Rest et al. describes the photometric measurements and cosmological inferences from the PS1 sample. The largest systematic uncertainty stems from the photometric calibration of the PS1 and low-z samples. We increase the sample of observed Calspec standards from 7 to 10 used to define the PS1 calibration system. The PS1 and SDSS-II calibration systems are compared and discrepancies up to ∼0.02 mag are recovered. We find uncertainties in the proper way to treat intrinsic colors and reddening produce differences in the recovered value of w up to 3%. We estimate masses of host galaxies of PS1 supernovae and detect an insignificant difference in distance residuals of the full sample of 0.037 ± 0.031 mag for host galaxies with high and low masses. Assuming flatness and including systematic uncertainties in our analysis of only SNe measurements, we find w =−1.120+0.360 −0.206(Stat)+0.269 −0.291(Sys). With additional constraints from Baryon acoustic oscillation, cosmic microwave background (CMB) (Planck) and H0 measurements, we find w = −1.166+0.072 −0.069 and Ωm = 0.280+0.013 −0.012 (statistical and systematic errors added in quadrature). The significance of the inconsistency with w = −1 depends on whether we use Planck or Wilkinson Microwave Anisotropy Probe measurements of the CMB: wBAO+H0+SN+WMAP = −1.124+0.083 −0.065.


Scolnic, D., Rest, A., Riess, A., Huber, M., Foley, R., Brout, D., …Waters, C. (2014). Systematic Uncertainties Associated with the Cosmological Analysis of the First Pan-STARRS1 Type Ia Supernova Sample. Astrophysical Journal, 795(1), Article 45.

Journal Article Type Article
Acceptance Date Jul 30, 2014
Publication Date Nov 1, 2014
Deposit Date Jun 16, 2015
Publicly Available Date Jun 30, 2015
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 795
Issue 1
Article Number 45
Keywords Dark energy, Supernovae: general.


Published Journal Article (2.6 Mb)

Copyright Statement
© 2014. The American Astronomical Society. All rights reserved.

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