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Companion star could have triggered supernova

Extra blue light supports explanation for type 1a explosions

3:00pm, March 23, 2016

PURPLE HAZE  Supernova SN 2012cg (bright dot, center) exploded in a hazy galaxy (purple) 50 million light-years away. The explosion might have been triggered by a companion star, a new study reports.

Debris from a cosmic explosion bumped into a neighboring star, a new study reports, suggesting that the surviving star might be responsible for its partner’s demise. 

The explosion, known as a type 1a supernova, was discovered in 2012. It went off in a galaxy about 50 million light-years away in the constellation Virgo. Astronomers quickly noticed more blue light coming from the supernova than expected. The excess light probably came from gas that was compressed and heated as the shock wave ran into another star, Howie Marion, an astronomer at the University of Texas at Austin, and colleagues report online March 22 in the Astrophysical Journal. It’s the first strong evidence that some normal type 1a supernovas have orbiting companions.

Astronomers suspect that a type 1a supernova is the detonation of a white dwarf, the dense core left behind after some stars die. What

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