Journal Article

Peculiar Type II supernovae from blue supergiants

Io K. W. Kleiser, Dovi Poznanski, Daniel Kasen, Timothy R. Young, Ryan Chornock, Alexei V. Filippenko, Peter Challis, Mohan Ganeshalingam, Robert P. Kirshner, Weidong Li, Thomas Matheson, Peter E. Nugent and Jeffrey M. Silverman

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 1, pages 372-382
Published in print July 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18708.x
Peculiar Type II supernovae from blue supergiants

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The vast majority of Type II supernovae (SNeII) are produced by red supergiants, but SN 1987A revealed that blue supergiants (BSGs) can produce members of this class as well, albeit with some peculiar properties. This best-studied event revolutionized our understanding of SNe and linking it to the bulk of Type II events is essential. We present here the optical photometry and spectroscopy gathered for SN 2000cb, which is clearly not a standard SNII and yet is not a SN 1987A analogue. The light curve of SN 2000cb is reminiscent of that of SN 1987A in shape, with a slow rise to a late optical peak, but on substantially different time-scales. Spectroscopically, SN 2000cb resembles a normal SNII, but with ejecta velocities that far exceed those measured for SN 1987A or normal SNeII, above 18 000 km s−1 for Hα at early times. The red colours, high velocities, late photometric peak and our modelling of this object all point towards a scenario involving the high-energy explosion of a small-radius star, most likely a BSG, producing 0.1 M of 56Ni. Adding a similar object to the sample, SN 2005ci, we derive a rate of ∼2 per cent of the core-collapse rate for this loosely defined class of BSG explosions.

Keywords: supernovae: general; supernovae: individual: SN 2000cb; supernovae: individual: SN 1987A; supernovae: individual: SN 2005ci; supernovae: individual: SN 1998A; supernovae: individual: SN 1999em

Journal Article.  7200 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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