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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 |
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| 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: | 04 Sep 2021 11:55 |
| DOI or ID number: | 10.3847/0004-637X/823/2/147 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/5586 |
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