A Multi-wavelength Perspective on the GRB-SN Connection

Details A Multi-wavelength Perspective on the GRB-SN Connection A Multi-wavelength Perspective on the GRB-SN Connection

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20922702s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #227.02; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

With the discovery of Type Ic SNe 1998bw and 2006aj in association with nearby GRB 980425 and XRF 060218, respectively, a new class of cosmic explosion has been identified. In comparison with typical GRBs, these events are sub-energtic by a factor of 100 but are up to 10 times more common. Moreover, they are distinguished from ordinary Type Ibc supernovae by the presense of a central engine. These intermediate explosions are identified through radio observations which probe relativistic material. Motivated by SN 1998bw, we began a comprehensive study of local Type Ibc SNe with the Very Large Array in 1999. Since then we have observed 150 optically-selected local (d < 150 Mpc) SNe Ibc, each within a few weeks of explosion. This six-year effort has resulted in two key advances. The first is a clear distinction between GRBs/XRFs and ordinary SNe Ibc: engine-driven explosions are rare, less than 3% of the local sample, and couple at least 10^{48} erg to mildly-relativistic ejecta. Second, we find a wide dispersion in the radio properties of SNe Ibc, implying significant variations in their ejecta properties, environments and/or progenitor systems. I will discuss the surprising results of our ongoing survey and the complex picture of stellar death that is emerging.

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