Optical observations of the fast declining type Ib supernova iPTF13bvn

Srivastav, Shubham ; Anupama, G. C. ; Sahu, D. K. (2014) Optical observations of the fast declining type Ib supernova iPTF13bvn Monthly Notices of the Royal Astronomical Society, 445 (2). pp. 1932-1941. ISSN 0035-8711

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Official URL: http://mnras.oxfordjournals.org/content/445/2/1932...

Related URL: http://dx.doi.org/10.1093/mnras/stu1878


We present optical UBVRI photometry and medium resolution spectroscopy of the Type Ib supernova iPTF13bvn, spanning a phase of ~−13 d to +71 d with respect to B-band maximum. The post-maximum decline rates indicate a fast decline with Δm15(B) = 1.82. Correcting for a Galactic extinction E(B − V) MW = 0.045 and host galaxy extinction of E(B − V) host = 0.17, the absolute V-band magnitude peaks at MV = −17.23 ± 0.20. The bolometric light curve indicates that ~0.09 M☉ of 56Ni was synthesized in the explosion. The earliest spectrum (−13 d) shows the presence of He I 5876 Å feature at a velocity of ~15 000 km s−1, which falls rapidly by the time the SN approaches the epoch of B-band maximum. The photospheric velocity near maximum light, as indicated by the Fe ii 5169 Å feature, is ~9000 km s-1. The estimate for the 56Ni mass, together with the estimates for the ejected mass (Mej) and kinetic energy of the explosion (Ek) indicate that iPTF13bvn is a low-luminosity Type Ib supernova, with a lower than average ejected mass and kinetic energy. Our results suggest that the progenitor of iPTF13bvn is inconsistent with a single Wolf–Rayet star.

Item Type:Article
Source:Copyright of this article belongs to Oxford University Press.
Keywords:Supernovae: General; Supernovae: Individual: iPTF13bvn; Galaxies: Individual: NGC 5806
ID Code:100474
Deposited On:10 Dec 2016 12:58
Last Modified:12 Dec 2016 09:37

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