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Standardizing type Ia supernovae optical brightness using near infrared rebrightening time

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Title: Standardizing type Ia supernovae optical brightness using near infrared rebrightening time
Authors: Shariff, H
Dhawan, S
Jiao, X
Leibundgut, B
Trotta, R
Van Dyk, DA
Item Type: Journal Article
Abstract: Accurate standardization of Type Ia supernovae (SNIa) is instrumental to the usage of SNIa as distance indicators. We analyse a homogeneous sample of 22 lowz SNIa, observed by the Carnegie Supernova Project (CSP) in the optical and near infra-red (NIR). We study the time of the second peak in the J-band, t2, as an alternative standardization parameter of SNIa peak optical brightness, as measured by the standard SALT2 parameter mB. We use BAHAMAS, a Bayesian hierarchical model for SNIa cosmology, to estimate the residual scatter in the Hubble diagram. We find that in the absence of a colour correction, t2 is a better standardization parameter compared to stretch: t2 has a 1σ posterior interval for the Hubble residual scatter of σ∆µ = {0.250, 0.257} mag, compared to σ∆µ = {0.280, 0.287} mag when stretch (x1) alone is used. We demonstrate that when employed together with a colour correction, t2 and stretch lead to similar residual scatter. Using colour, stretch and t2 jointly as standardization parameters does not result in any further reduction in scatter, suggesting that t2 carries redundant information with respect to stretch and colour. With a much larger SNIa NIR sample at higher redshift in the future, t2 could be a useful quantity to perform robustness checks of the standardization procedure.
Issue Date: 9-Sep-2016
Date of Acceptance: 7-Sep-2016
URI: http://hdl.handle.net/10044/1/39893
DOI: https://dx.doi.org/10.1093/mnras/stw2278
ISSN: 1365-2966
Publisher: Oxford University Press (OUP)
Start Page: 4311
End Page: 4316
Journal / Book Title: Monthly Notices of the Royal Astronomical Society
Volume: 463
Issue: 4
Copyright Statement: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Sponsor/Funder: The Royal Society
Commission of the European Communities
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council [2006-2012]
Science and Technology Facilities Council [2006-2012]
Commission of the European Communities
European Commission
Science and Technology Facilities Council
Science and Technology Facilities Council (STFC)
Funder's Grant Number: WM110023
FP7-PEOPLE-2012-CIG-321865
ST/K001051/1
ST/K001051/1
ST/K001051/1
691164
H2020-MSCA-RISE-2015-691164
ST-N000838
ST/N000838/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
methods: data analysis
methods: statistical
supernovae: general
distance scale
PHOTOMETRY DATA RELEASE
LIGHT CURVES
ABSOLUTE MAGNITUDES
2ND MAXIMUM
PROJECT
CONSTRAINTS
MASS
LUMINOSITY
CONSTANT
NOVAE
astro-ph.CO
0201 Astronomical And Space Sciences
Publication Status: Published
Appears in Collections:Physics
Mathematics
Astrophysics
Statistics
Faculty of Natural Sciences



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