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ABSENCE OF FAST-MOVING IRON IN AN INTERMEDIATE TYPE Ia SUPERNOVA BETWEEN NORMAL AND SUPER-CHANDRASEKHAR
- Cao, Yi (author)
- Johansson, J. (author)
- Nugent, Peter E. (author)
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- Nordin, Jakob (author)
- Kulkarni, S. R. (author)
- Cenko, S. Bradley (author)
- Fox, Ori D. (author)
- Kasliwal, Mansi M. (author)
- Hsiao, E. Y. (author)
- Perley, D. A. (author)
- Bue, Brian D. (author)
- Masci, Frank J. (author)
- Lee, William H. (author)
- Chotard, Nicolas (author)
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- (creator_code:org_t)
- 2016
- 2016
- English.
- In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 823:2
- Journal article (peer-reviewed)
Abstract
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- 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 Delta m(15)=1.03 +/- 0.01) and overall spectral features resemble those of normal SNe Ia. On the other hand, its large peak optical and UV luminosity (M-B = -19.84 mag, M-uvm2 = -15.5 mag) 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 Ni-56 mass of 0.81(-0.18)(+0.10) M-circle dot and a total ejecta mass of 1.59(-0.12)(+0.45) M-circle dot. The large ejecta mass of iPTF13asv and its stratified ejecta structure together seemingly favor a double-degenerate origin.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- supernovae: general
- supernovae: individual (iPTF13asv)
- ultraviolet: general
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Johansson, J.
- Nugent, Peter E.
- Goobar, Ariel
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- Kulkarni, S. R.
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- Cenko, S. Bradle ...
- Fox, Ori D.
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- Hsiao, E. Y.
- Perley, D. A.
- Bue, Brian D.
- Masci, Frank J.
- Lee, William H.
- Chotard, Nicolas
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