The rise time of normal and subluminous type Ia supernovae

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DOIResolve DOI: http://doi.org/10.1088/0004-637X/745/1/44
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TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
Volume745
Issue1
Article number44
AbstractWe calculate the average stretch-corrected rise time of Type Ia supernovae (SNeIa) in the Supernova Legacy Survey. We use the aggregate light curves of spectroscopic and photometrically identified SNeIa to fit the rising part of the light curve with a simple quadratic model. We obtain a light curve shape corrected, i.e., stretch-corrected, fiducial rise time of 17.02(exponential +0.18) -0.28 (stat) days. The measured rise time differs from an earlier finding by the SNLS (Conley etal.) due to the use of different SN Ia templates. We compare it to nearby samples using the same methods and find no evolution in the early part of the light curve of SNeIa up to z = 1. We search for variations among different populations, particularly subluminous objects, by dividing the sample in stretch. Bright and slow decliners (s > 1.0) have consistent stretch-corrected rise times compared to fainter and faster decliners (0.8 < s ≤ 1.0); they are shorter by 0.57 (exponential +0.47) -0.50 (stat) days. Subluminous SNeIa (here defined as objects with s ≤ 0.8), although less constrained, are also consistent, with a rise time of 18.03 (exponential +0.81) -1.37 (stat) days. We study several systematic biases and find that the use of different fiducial templates may affect the average rise time but not the intrinsic differences between populations. Based on our results, we estimate that subluminous SNeIa are powered by 0.05-0.35 M ⊙ of (exponential 56)Ni synthesized in the explosion. Our conclusions are the same for the single-stretch and two-stretch parameterizations of the light curve.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number21270250
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Record identifier99d192dd-e4ea-4566-91ff-0392c26722c2
Record created2014-01-16
Record modified2016-05-09
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