Details

Autor(en) / Beteiligte

• González-Gaitán, S
• Conley, A
• Bianco, F. B
• Howell, D. A
• Sullivan, M
• Perrett, K
• Carlberg, R
• Astier, P
• Balam, D
• Balland, C
• Basa, S
• Fouchez, D
• Fourmanoit, N
• Graham, M. L
• Guy, J
• Hardin, D
• Hook, I. M
• Lidman, C
• Pain, R
• Palanque-Delabrouille, N
• Pritchet, C. J
• Regnault, N
• Rich, J
• Ruhlmann-Kleider, V

Titel

The Rise Time of Normal and Subluminous Type Ia Supernovae

Ist Teil von

• The Astrophysical journal, 2012-01, Vol.745 (1), p.44-13

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2012

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• (ProQuest: ... denotes formulae and/or non-USASCII text omitted) We calculate the average stretch-corrected rise time of Type Ia supernovae (SNe Ia) in the Supernova Legacy Survey. We use the aggregate light curves of spectroscopic and photometrically identified SNe Ia 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 ... (stat) days. The measured rise time differs from an earlier finding by the SNLS (Conley et al.) 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 SNe Ia 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 [< or =, slant] 1.0); they are shorter by ... (stat) days. Subluminous SNe Ia (here defined as objects with s [< or =, slant] 0.8), although less constrained, are also consistent, with arise time of ... (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 SNe Ia are powered by 0.05-0.35 M sub([middot in circle]) of super(56)Ni synthesized in the explosion. Our conclusions are the same for the single-stretch and two-stretch parameterizations of the light curve.