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

Cao, Y and Johansson, J and Nugent, PE and Goobar, A and Nordin, J and Kulkarni, SR and Cenko, SB and Fox, OD and Kasliwal, MM and Fremling, C and Amanullah, R and Hsiao, EY and Perley, DA and Bue, BD and Masci, FJ and 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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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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