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Astronomy Tea Talks at Caltech

Mondays, Robinson 106
Tea:  4.00pm
Talk: 4.15pm

Organized by:

2008 - 2009 season:
1 December 2008 Jeff Cooke (UC Irvine)

"The Detection of z > 2 Type IIn Supernovae in the CFHTLS Deep Fields"

Type IIn supernovae (SNe IIn) result from the deaths of the most massive stars. The broad magnitude
distribution of SNe IIn make these the brightest SN events ever recorded. In addition, they are
the brightest SNe in the rest-frame UV which make them ideal targets for high redshift searches. I
will discuss our method of detecting 1.9 < z < 3.3 SNe IIn events in the CFHTLS Deep survey and present
compelling photometric candidates and spectroscopic host galaxy redshifts. In addition, SNe IIn
spectra exhibit extremely bright narrow emission lines. This is a result of the interaction between
SN ejecta and cool circumstellar material released in pre-explosion outbursts. SNe IIn emission lines
remain bright for years after outburst and are above the thresholds of current 8m-class telescope
sensitivities even out to z ~ 3. The detection and evolution of these lines can be used to confirm
high redshift SNe and measure their energies. I will conclude with the implications of the data on
the universal SNe IIn density, the high-redshift Type II supernova rate, and discuss our future
program to spectroscopiclly confirm the emission of detected z > 2 SNe IIn, and the potential of
future projects such as LSST and TMT

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Last modified on 20th Jul 2011 by Scott Schnee.  

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