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The Massive Progenitor of the Type II-Linear SN 2009kr
N. Elias-Rosa, S. D. Van Dyk, W. Li +13
We present early-time photometric and spectroscopic observations of supernova (SN) 2009kr in NGC 1832. We find that its properties to date support its classification as Type II-lin…
Large Late-time Asphericities in Three Type IIP Supernovae
Ryan Chornock, Alexei V. Filippenko, Weidong Li +1
Type II-plateau supernovae (SNe IIP) are the results of the explosions of red supergiants and are the most common subclass of core-collapse supernovae. Past observations have shown…
SN 2006bt: A Perplexing, Troublesome, and Possibly Misleading Type Ia Supernova
Ryan J. Foley, Gautham Narayan, Peter J. Challis +4
SN 2006bt displays characteristics unlike those of any other known Type Ia supernova (SN Ia). We present optical light curves and spectra of SN 2006bt which demonstrate the peculia…
Characteristic velocities of stripped-envelope core-collapse supernova cores
I. Maurer, P. A. Mazzali, J. Deng +9
The velocity of the inner ejecta of stripped-envelope core-collapse supernovae (CC-SNe) is studied by means of an analysis of their nebular spectra. Stripped-envelope CC-SNe are th…
Unveiling the Origin of GRB 090709A: Lack of Periodicity in a Reddened Cosmological Long-Duration Gamma-Ray Burst
S. B. Cenko, N. R. Butler, E. O. Ofek +15
We present broadband (gamma-ray, X-ray, near-infrared, optical, and radio) observations of the gamma-ray burst (GRB) 090709A and its afterglow in an effort to ascertain the origin…
An Unusually Fast-Evolving Supernova
Dovi Poznanski, Ryan Chornock, Peter E. Nugent +6
Analyses of supernovae (SNe) have revealed two main types of progenitors: exploding white dwarfs and collapsing massive stars. We present SN2002bj, which stands out as different fr…