An Empirical Fitting Method for Type Ia Supernova Light Curves. II. Estimating the First-light Time and Rise Time

Weikang Zheng; Patrick L. Kelly; Alexei V. Filippenko

doi:10.3847/1538-4357/aa8b19

An Empirical Fitting Method for Type Ia Supernova Light Curves. II. Estimating the First-light Time and Rise Time

Weikang Zheng, Patrick L. Kelly, Alexei V. Filippenko

Minnesota Institute for Astrophysics

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17 Scopus citations

Abstract

We investigate a new empirical fitting method for the optical light curves of Type Ia supernovae (SNe Ia) that is able to estimate the first-light time of SNe Ia, even when they are not discovered extremely early. With an improved ability to estimate the time of first light for SNe Ia, we compute the rise times for a sample of 56 wellobserved SNe Ia. We find rise times ranging from 10.5 to 20.5 days, with a mean of 16.0 days, and confirm that the rise time is generally correlated with the decline rate Δm₁₅ (B), but with large scatter. The rise time could be an additional parameter to help classify SN Ia subtypes.

Original language	English (US)
Article number	66
Journal	Astrophysical Journal
Volume	848
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aa8b19
State	Published - Oct 10 2017

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© 2017. The American Astronomical Society. All rights reserved.

Keywords

methods: data analysis
supernovae: general

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AB - We investigate a new empirical fitting method for the optical light curves of Type Ia supernovae (SNe Ia) that is able to estimate the first-light time of SNe Ia, even when they are not discovered extremely early. With an improved ability to estimate the time of first light for SNe Ia, we compute the rise times for a sample of 56 wellobserved SNe Ia. We find rise times ranging from 10.5 to 20.5 days, with a mean of 16.0 days, and confirm that the rise time is generally correlated with the decline rate Δm15 (B), but with large scatter. The rise time could be an additional parameter to help classify SN Ia subtypes.

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An Empirical Fitting Method for Type Ia Supernova Light Curves. II. Estimating the First-light Time and Rise Time

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