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The Rise Time of the Normal Type Ia SN 1990N

Published online by Cambridge University Press:  26 May 2016

Paolo A. Mazzali  and
Brian P. Schmidt
Paolo A. Mazzali
Affiliation:
Osservatorio Astronomico, Via Tiepolo, 11, Trieste, I-34131, Italy
Brian P. Schmidt
Affiliation:
Mt. Stromlo and Siding Spring Obs., ACT, Australia

Abstract

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The earliest spectrum available of a well-observed, local type Ia SN, the UV-optical spectrum of SN 1990N obtained 14 days before B maximum, was modelled with a Monte Carlo code in order to determine its epoch and consequently the rise time from explosion to B max, which is important for fitting template light curves. If a standard density distribution and composition for the SN ejecta are used, and the Cepheid distance modulus to the host galaxy, NGC4639 in the Virgo cluster, μ = 32.0, is adopted, the spectrum is best reproduced for an epoch t = 5.5 ± 1 days, implying for the SN a rise time of 19.5 ± 1 days. For a shorter μ, t is smaller, but for a T-F distance μ = 31.4 the solution is not consistent.

Type
Part VII: Evidence for non-zero A
Information
Symposium - International Astronomical Union , Volume 201: New Cosmological Data and the Values of the Fundamental Parameters , 2005 , pp. 241 - 244
Copyright
Copyright © Astronomical Society of the Pacific 2005 

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