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Absence of fast-moving iron in an intermediate type ia supernova between normal and super-chandrasekhar

Cao, Y, Johansson, J, Nugent, PE, Goobar, A, Nordin, J, Kulkarni, SR, Cenko, SB, Fox, OD, Kasliwal, MM, Fremling, C, Amanullah, R, Hsiao, EY, Perley, DA, Bue, BD, Masci, FJ, Lee, WH and Chotard, N (2016) Absence of fast-moving iron in an intermediate type ia supernova between normal and super-chandrasekhar. The Astrophysical Journal, 823 (2). ISSN 1538-4357

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Abstract

The American Astronomical Society. All rights reserved.In this paper, we report observations of a peculiar SN Ia iPTF13asv (a.k.A., SN2013cv) from the onset of the explosion to months after its peak. The early-phase spectra of iPTF13asv show an absence of iron absorption, indicating that synthesized iron elements are confined to low-velocity regions of the ejecta, which, in turn, implies a stratified ejecta structure along the line of sight. Our analysis of iPTF13asv's light curves and spectra shows that it is an intermediate case between normal and super-Chandrasekhar events. On the one hand, its light curve shape (B-band ) and overall spectral features resemble those of normal SNe Ia. On the other hand, its large peak optical and UV luminosity (, ) and its low but almost constant Si ii velocities of about 10,000 km s-1 are similar to those in super-Chandrasekhar events, and its persistent carbon signatures in the spectra are weaker than those seen commonly in super-Chandrasekhar events. We estimate a 56Ni mass of and a total ejecta mass of . The large ejecta mass of iPTF13asv and its stratified ejecta structure together seemingly favor a double-degenerate origin. © 2016.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 17 Feb 2017 12:19
Last Modified: 07 Sep 2017 13:03
DOI or Identification number: 10.3847/0004-637X/823/2/147
URI: http://researchonline.ljmu.ac.uk/id/eprint/5586

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