THE BROAD-LINED Type Ic SN 2012ap AND THE NATURE OF RELATIVISTIC SUPERNOVAE LACKING A GAMMA-RAY BURST DETECTION

@article{Milisavljevic2014THEBT,
  title={THE BROAD-LINED Type Ic SN 2012ap AND THE NATURE OF RELATIVISTIC SUPERNOVAE LACKING A GAMMA-RAY BURST DETECTION},
  author={Dan Milisavljevic and Raffaella Margutti and Jerod Parrent and Alicia Margarita Soderberg and Robert A. Fesen and Paolo A. Mazzali and Kei-ichi Maeda and Nathan Edward Sanders and S. Bradley Cenko and Jeffrey M. Silverman and Alexei V. Filippenko and Atish Kamble and Sayan Chakraborti and Maria R. Drout and Robert P. Kirshner and Timothy Edward Pickering and Koji S. Kawabata and Takashi Hattori and Eric Y. Hsiao and Maximilian D. Stritzinger and G. H. Marion and J{\'o}zsef Vink{\'o} and J. Craig Wheeler},
  journal={The Astrophysical Journal},
  year={2014},
  volume={799}
}
We present ultraviolet, optical, and near-infrared observations of SN 2012ap, a broad-lined Type Ic supernova in the galaxy NGC 1729 that produced a relativistic and rapidly decelerating outflow without a gamma-ray burst signature. Photometry and spectroscopy follow the flux evolution from −13 to +272 days past the B-band maximum of −17.4 ± 0.5 mag. The spectra are dominated by Fe ii, O i, and Ca ii absorption lines at ejecta velocities of v ≈ 20,000 km s−1 that change slowly over time. Other… 

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