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Sampling the probability distribution of Type Ia Supernova lightcurve parameters in cosmological analysis

Dai, Mi and Wang, Yun (2016) Sampling the probability distribution of Type Ia Supernova lightcurve parameters in cosmological analysis. Monthly Notices of the Royal Astronomical Society, 459 (2). pp. 1819-1826. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20160707-090752668

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Abstract

In order to obtain robust cosmological constraints from Type Ia supernova (SN Ia) data, we have applied Markov Chain Monte Carlo (MCMC) to SN Ia lightcurve fitting. We develop a method for sampling the resultant probability density distributions (pdf) of the SN Ia lightcuve parameters in the MCMC likelihood analysis to constrain cosmological parameters, and validate it using simulated data sets. Applying this method to the ‘joint lightcurve analysis (JLA)’ data set of SNe Ia, we find that sampling the SN Ia lightcurve parameter pdf's leads to cosmological parameters closer to that of a flat Universe with a cosmological constant, compared to the usual practice of using only the best-fitting values of the SN Ia lightcurve parameters. Our method will be useful in the use of SN Ia data for precision cosmology.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/mnras/stw762DOIArticle
http://mnras.oxfordjournals.org/content/459/2/1819PublisherArticle
http://arxiv.org/abs/1505.05086arXivDiscussion Paper
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 March 29. Received 2016 March 29; in original form 2015 May 19. First published online April 5, 2016. We are grateful to Rick Kessler and Alex Conley for very helpful discussions. The computing for this project was performed at the OU Supercomputing Center for Education & Research (OSCER) at the University of Oklahoma (OU).
Group:Infrared Processing and Analysis Center (IPAC)
Subject Keywords:supernovae: general – cosmological parameters – cosmology: observations – dark energy
Issue or Number:2
Record Number:CaltechAUTHORS:20160707-090752668
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160707-090752668
Official Citation:Mi Dai and Yun Wang Sampling the probability distribution of Type Ia Supernova lightcurve parameters in cosmological analysis MNRAS (June 21, 2016) Vol. 459 1819-1826 doi:10.1093/mnras/stw762 first published online April 5, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68882
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Jul 2016 19:37
Last Modified:03 Oct 2019 10:17

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