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Unformatted text preview: 4.2.6 Supernovae in binary systems It is quite common for a supernova to be in a binary system. In fact, some supernovae are caused by a companion star's dumping mass on a star, until the latter explodes (section 4.3.4, below). What happens to the binary system when the explosion occurs? It turns out that the force of the explosion is not an important e ect on the star, but its mass loss is. Before the supernova we have (say) two stars in circular orbit: v1 M1 r1 r2 CoM M2 v2 Putting the CoM at rest, we have M1v1 + M2v2 = 0 M1r1 + M2r2 = 0 : Let M1 be the mass that explodes. Typically it is the more massive star that explodes, so M1 > M2. When it explodes, it quickly (and spherically, say) blows o most of its mass, so that its new mass M10 is M10 = M1 M and we have 87...
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