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Supernova rapidly creates dust between stars

Explosions are probably primary source of dust in galaxies

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1:00pm, July 9, 2014

VIOLENT ORIGINS  X-rays burst from supernova SN 2010jl (bright purple circle, top), seen in a composite image from the Chandra and Hubble space telescopes of its host galaxy. Within weeks of the explosion, a shell of interstellar dust formed around the dead star.

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Supernova 2010jl is helping unravel the origin of interstellar dust, the sootlike grains that fill the space between stars. New observations published July 9 in Nature show a shell of dust forming around the dying star within weeks of the explosion. The data support the idea that supernovas are the main dust factories in the universe.

The unusually bright supernova, first seen in 2010, is roughly 160 million light-years away in the constellation Leo. Researchers watched the dust form almost in real time for nearly two and a half years using the Very Large Telescope in Chile. They did so by tracking how much the dust dimmed different colors of light from the explosion.

The dust probably formed in the wake of the supernova’s shock wave, which traveled at nearly 126 million kilometers per hour as it tore through clouds of gas that had previously been shed by the dying star. The dust grains are larger than expected, some bigger than a micrometer, which should help them survive the harsh environment of interstellar space, says lead author Christa Gall, of Aarhus University in Denmark. Their hardiness helps explain how supernovas might contribute much of the dust amid galaxies, she adds.

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