ABSENCE OF FAST-MOVING IRON IN AN INTERMEDIATE TYPE Ia SUPERNOVA BETWEEN NORMAL AND SUPER-CHANDRASEKHAR

ABSTRACT 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 re...

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Published in:The Astrophysical journal 2016-06, Vol.823 (2), p.147-147
Main Authors: Cao, Yi, Johansson, J., Nugent, Peter E., Goobar, A., Nordin, Jakob, Kulkarni, S. R., Cenko, S. Bradley, Fox, Ori D., Kasliwal, Mansi M., Fremling, C., Amanullah, R., Hsiao, E. Y., Perley, D. A., Bue, Brian D., Masci, Frank J., Lee, William H., Chotard, Nicolas
Format: Article
Language:English
Subjects:
Absorption
ASTRONOMY AND ASTROPHYSICS
Carbon
Ejecta
iPTF13asv
Iron
Line of sight
Spectra
Supernovae
supernovae: general
supernovae: individual (iPTF13asv)
Texts
ultraviolet
ultraviolet: general
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Summary:ABSTRACT 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.
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.3847/0004-637X/823/2/147