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Title:
Cosmological Inference from Host-Selected Type Ia Supernova Samples
Authors:
Uddin, Syed A.; Mould, Jeremy; Lidman, Chris; Ruhlmann-Kleider, Vanina; Hardin, Delphine
Affiliation:
AA(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Melbourne, VIC 3122, Australia; Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, Jiangshu 210008, China; Australian Research Council Centre of Excellence for All-Sky Astrophysics, Building A28, School of Physics, The University of Sydney, NSW 2006, Australia), AB(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Melbourne, VIC 3122, Australia; Australian Research Council Centre of Excellence for All-Sky Astrophysics, Building A28, School of Physics, The University of Sydney, NSW 2006, Australia), AC(Australian Astronomical Observatory, North Ryde, NSW 2113, Australia; Australian Research Council Centre of Excellence for All-Sky Astrophysics, Building A28, School of Physics, The University of Sydney, NSW 2006, Australia), AD(CEA, Centre de Saclay, Irfu/SPP, 91191 Gif-sur-Yvette, Paris, France), AE(Universite Pierre et Marie Curie, Laboratoire de Physique Nucleaire et des Hautes Energies, 4 place Jussieu, Paris, France)
Publication:
Publications of the Astronomical Society of Australia, Volume 34, id.e009 7 pp. (PASA Homepage)
Publication Date:
01/2017
Origin:
CUP
Astronomy Keywords:
stars: supernovae: general, (cosmology): dark energy
Abstract Copyright:
2017: Astronomical Society of Australia
DOI:
10.1017/pasa.2017.2
Bibliographic Code:
2017PASA...34....9U

Abstract

We compare two Type Ia supernova samples that are drawn from a spectroscopically confirmed Type Ia supernova sample: a host-selected sample in which SNe Ia are restricted to those that have a spectroscopic redshift from the host; and a broader, more traditional sample in which the redshift could come from either the SN or the host. The host-selected sample is representative of SN samples that will use the redshift of the host to infer the SN redshift, long after the SN has faded from view. We find that SNe Ia that are selected on the availability of a redshift from the host differ from SNe Ia that are from the broader sample. The former tend to be redder, have narrower light curves, live in more massive hosts, and tend to be at lower redshifts. We find that constraints on the equation of state of dark energy, w, and the matter density, OmegaM, remain consistent between these two types of samples. Our results are important for ongoing and future supernova surveys, which unlike previous supernova surveys, will have limited real-time follow-up to spectroscopically classify the SNe they discover. Most of the redshifts in these surveys will come from the hosts.
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