Correcting Type Ia Supernova Distances for Selection Biases and Contamination in Photometrically Identified Samples

被引:213
作者
Kessler, R. [1 ,2 ]
Scolnic, D. [1 ]
机构
[1] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA
[2] Univ Chicago, Dept Astron & Astrophys, 5640 South Ellis Ave, Chicago, IL 60637 USA
基金
美国国家科学基金会; 美国国家航空航天局;
关键词
cosmological parameters; supernovae: general; SYSTEMATIC UNCERTAINTIES; COSMOLOGICAL CONSTRAINTS; SDSS-II; CLASSIFICATION; SEARCH; COLOR;
D O I
10.3847/1538-4357/836/1/56
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a new technique to create a bin-averaged Hubble diagram (HD) from photometrically identified SN. Ia data. The resulting HD is corrected for selection biases and contamination from core-collapse (CC) SNe, and can be used to infer cosmological parameters. This method, called "BEAMS with Bias Corrections" ( BBC), includes two fitting stages. The first BBC fitting stage uses a posterior distribution that includes multiple SN likelihoods, a Monte Carlo simulation to bias-correct the fitted SALT-II parameters, and CC probabilities determined from a machine-learning technique. The BBC fit determines (1) a bin-averaged HD (average distance versus redshift), and (2) the nuisance parameters alpha and beta, which multiply the stretch and color (respectively) to standardize the SN brightness. In the second stage, the bin-averaged HD is fit to a cosmological model where priors can be imposed. We perform high-precision tests of the BBC method by simulating large (150,000 event) data samples corresponding to the Dark Energy Survey Supernova Program. Our tests include three models of intrinsic scatter, each with two different CC rates. In the BBC fit, the SALT-II nuisance parameters a and a are recovered to within 1% of their true values. In the cosmology fit, we determine the dark energy equation of state parameter w using a fixed value of Omega(M) as a prior: averaging over all six tests based on 6x150,000 = 900,000 SNe, there is a small wbias of 0.006 +/- 0.002. Finally, the BBC fitting code is publicly available in the SNANA package.
引用
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页数:14
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