AgrinwithoutacatthefirstcentralenginedrivenSN.PDF

A grin without a cat: A grin without a cat: the first central engine driven SN 2009bb without the associated GRB Alak Ray Tata Institute of Fundamental Research, Mumbai JIGSAW10, Mumbai, Feb 26, 2010 Friday 26 February 2010 1 Core-collapse supernovae SNe and their relation with GRBs Result from collapse of iron cores of massive stars M8 Msun. They lead to neutron stars, black holes as compact stellar remnants. A subset of core-collapse SNe of type Ic’s have been found in some cases to be associated with long duration Gamma Ray Bursts. For example SN 1998bw was found to be coincident with GRB 980425. Normally a typical SN would show a non-relativistic outflow of its outermost layers as seen by the non-thermal radio emission from it, whereas a GRB outflow is initially relativistic, believed to be powered by a “central engine”. Friday 26 February 2010 2 Different types of Supernovae 6150A deep absorption trough due to blueshifted 6355A lines from high velocity ejecta Found in all types of galaxies Found in spiral including ellipticals. In spiral galaxies Hubble type galaxies they are in interarm Sbc or later, close to regions, i.e. they have moved HII regions from their birthplace After M. Turatto 2004 Friday 26 February 2010