First cosmology results using type Ia supernovae from the Dark Energy Survey: the effect of host galaxy properties on supernova luminosity

M Smith; M Sullivan; P Wiseman; R Kessler; D Scolnic; D Brout; C B D’Andrea; T M Davis; R J Foley; C Frohmaier; L Galbany; R R Gupta; C P Gutiérrez; S R Hinton; L Kelsey; C Lidman; E Macaulay; A Möller; R C Nichol; P Nugent; A Palmese; M Pursiainen; M Sako; E Swann; R C Thomas; B E Tucker; M Vincenzi; D Carollo; G F Lewis; N E Sommer; T M C Abbott; M Aguena; S Allam; S Avila; E Bertin; S Bhargava; D Brooks; E Buckley-Geer; D L Burke; A Carnero Rosell; M Carrasco Kind; M Costanzi; L N da Costa; J De Vicente; S Desai; H T Diehl; P Doel; T F Eifler; S Everett; B Flaugher; P Fosalba; J Frieman; J García-Bellido; E Gaztanaga; K Glazebrook; D Gruen; R A Gruendl; J Gschwend; G Gutierrez; W G Hartley; D L Hollowood; K Honscheid; D J James; E Krause; K Kuehn; N Kuropatkin; M Lima; N MacCrann; M A G Maia; J L Marshall; P Martini; P Melchior; F Menanteau; R Miquel; F Paz-Chinchón; A A Plazas; A K Romer; A Roodman; E S Rykoff; E Sanchez; V Scarpine; M Schubnell; S Serrano; I Sevilla-Noarbe; E Suchyta; M E C Swanson; G Tarle; D Thomas; D L Tucker; T N Varga; A R Walker; DES Collaboration

doi:10.1093/mnras/staa946

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First cosmology results using type Ia supernovae from the Dark Energy Survey: the effect of host galaxy properties on supernova luminosity

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First cosmology results using type Ia supernovae from the Dark Energy Survey: the effect of host galaxy properties on supernova luminosity

M Smith, M Sullivan, P Wiseman, R Kessler, D Scolnic, D Brout, C B D’Andrea, T M Davis, R J Foley, C Frohmaier, …

Monthly notices of the Royal Astronomical Society, Vol.494(3), pp.4426-4447

30/01/2020

DOI: https://doi.org/10.1093/mnras/staa946

Abstract

surveys

cosmology: observations

supernovae: general

distance scale

transients: supernovae

ABSTRACT We present improved photometric measurements for the host galaxies of 206 spectroscopically confirmed type Ia supernovae discovered by the Dark Energy Survey Supernova Program (DES-SN) and used in the first DES-SN cosmological analysis. For the DES-SN sample, when considering a 5D (z, x1, c, α, β) bias correction, we find evidence of a Hubble residual ‘mass step’, where SNe Ia in high-mass galaxies (>1010M⊙) are intrinsically more luminous (after correction) than their low-mass counterparts by $\gamma =0.040\pm 0.019$ mag. This value is larger by 0.031 mag than the value found in the first DES-SN cosmological analysis. This difference is due to a combination of updated photometric measurements and improved star formation histories and is not from host-galaxy misidentification. When using a 1D (redshift-only) bias correction the inferred mass step is larger, with $\gamma =0.066\pm 0.020$ mag. The 1D−5D γ difference for DES-SN is $0.026\pm 0.009$ mag. We show that this difference is due to a strong correlation between host galaxy stellar mass and the x1 component of the 5D distance-bias correction. Including an intrinsic correlation between the observed properties of SNe Ia, stretch and colour, and stellar mass in simulated SN Ia samples, we show that a 5D fit recovers γ with −9 mmag bias compared to a +2 mmag bias for a 1D fit. This difference can explain part of the discrepancy seen in the data. Improvements in modelling correlations between galaxy properties and SN is necessary to ensure unbiased precision estimates of the dark energy equation of state as we enter the era of LSST.

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Title: First cosmology results using type Ia supernovae from the Dark Energy Survey: the effect of host galaxy properties on supernova luminosity
Creators: M Smith - University of Southampton
M Sullivan - University of Southampton
P Wiseman - University of Southampton
R Kessler - University of Chicago
D Scolnic - Duke University
D Brout - University of Pennsylvania
C B D’Andrea - University of Pennsylvania
T M Davis - University of Queensland
R J Foley - Santa Cruz Institute for Particle Physics, Santa Cruz, CA 95064, USA
C Frohmaier - University of Portsmouth
L Galbany - University of Pittsburgh
R R Gupta - Lawrence Berkeley National Laboratory
C P Gutiérrez - University of Southampton
S R Hinton - University of Queensland
L Kelsey - University of Southampton
C Lidman - Australian National University
E Macaulay - University of Portsmouth
A Möller - Australian National University
R C Nichol - University of Portsmouth
P Nugent - Lawrence Berkeley National Laboratory
A Palmese - Fermi National Accelerator Laboratory
M Pursiainen - University of Southampton
M Sako - University of Pennsylvania
E Swann - University of Portsmouth
R C Thomas - Lawrence Berkeley National Laboratory
B E Tucker - Australian National University
M Vincenzi - University of Portsmouth
D Carollo - Osservatorio Astrofisico di Torino
G F Lewis - University of Sydney
N E Sommer - Australian National University
T M C Abbott - Cerro Tololo Inter-American Observatory
M Aguena - Laboratório Interinstitucional de e-Astronomia
S Allam - Fermi National Accelerator Laboratory
S Avila - Autonomous University of Madrid
E Bertin - Institut d'Astrophysique de Paris
S Bhargava - University of Sussex
D Brooks - University College London
E Buckley-Geer - Fermi National Accelerator Laboratory
D L Burke - SLAC National Accelerator Laboratory
A Carnero Rosell - Laboratório Interinstitucional de e-Astronomia
M Carrasco Kind - University of Illinois at Urbana Champaign
M Costanzi - Trieste Astronomical Observatory
L N da Costa - Laboratório Interinstitucional de e-Astronomia
J De Vicente - Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
S Desai - Indian Institute of Technology Hyderabad
H T Diehl - Fermi National Accelerator Laboratory
P Doel - University College London
T F Eifler - University of Arizona
S Everett - Santa Cruz Institute for Particle Physics, Santa Cruz, CA 95064, USA
B Flaugher - Fermi National Accelerator Laboratory
P Fosalba - Institute of Space Sciences
J Frieman - University of Chicago
J García-Bellido - Autonomous University of Madrid
E Gaztanaga - Institute of Space Sciences
K Glazebrook - Swinburne University of Technology
D Gruen - Kavli Institute for Particle Astrophysics and Cosmology
R A Gruendl - University of Illinois Urbana-Champaign
J Gschwend - Laboratório Interinstitucional de e-Astronomia
G Gutierrez - Fermi National Accelerator Laboratory
W G Hartley - University College London
D L Hollowood - Santa Cruz Institute for Particle Physics, Santa Cruz, CA 95064, USA
K Honscheid - The Ohio State University
D J James - Center for Astrophysics Harvard & Smithsonian
E Krause - University of Arizona
K Kuehn - Australian Astronomical Observatory
N Kuropatkin - Fermi National Accelerator Laboratory
M Lima - Laboratório Interinstitucional de e-Astronomia
N MacCrann - The Ohio State University
M A G Maia - Laboratório Interinstitucional de e-Astronomia
J L Marshall - Mitchell Institute
P Martini - The Ohio State University
P Melchior - Princeton University
F Menanteau - National Center for Supercomputing Applications
R Miquel - Institució Catalana de Recerca i Estudis Avançats
F Paz-Chinchón - University of Cambridge
A A Plazas - Princeton University
A K Romer - University of Sussex
A Roodman - Kavli Institute for Particle Astrophysics and Cosmology
E S Rykoff - Kavli Institute for Particle Astrophysics and Cosmology
E Sanchez - Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
V Scarpine - Fermi National Accelerator Laboratory
M Schubnell - University of Michigan–Ann Arbor
S Serrano - Institute of Space Sciences
I Sevilla-Noarbe - Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
E Suchyta - Oak Ridge National Laboratory
M E C Swanson - National Center for Supercomputing Applications
G Tarle - University of Michigan–Ann Arbor
D Thomas - University of Portsmouth
D L Tucker - Fermi National Accelerator Laboratory
T N Varga - Max Planck Institute for Extraterrestrial Physics
A R Walker - Cerro Tololo Inter-American Observatory
DES Collaboration
Publication Details: Monthly notices of the Royal Astronomical Society, Vol.494(3), pp.4426-4447
Publisher: Oxford University Press
Date published: 30/01/2020
Identifiers: 99820328402346
Academic Unit: FEPS Central Faculty Admin
Language: English
Resource Type: Journal article

First cosmology results using type Ia supernovae from the Dark Energy Survey: the effect of host galaxy properties on supernova luminosity

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