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posted by Fnord666 on Saturday January 25 2020, @04:23PM   Printer-friendly
from the heavy-light dept.

New insights about the brightest explosions in the Universe:

Swedish and Japanese researchers have, after ten years, found an explanation to the peculiar emission lines seen in one of the brightest supernovae ever observed—SN 2006gy. At the same time they found an explanation for how the supernova arose.

Superluminous supernovae are the most luminous explosions in the cosmos. SN 2006gy is one of the most studied such events, but researchers have been uncertain about its origin. Astrophysicists at Stockholm University have, together with Japanese colleagues, now discovered large amounts of iron in the supernova through spectral lines that have never previously been seen either in supernovae or in other astrophysical objects. That has led to a new explanation for how the supernova arose.

"No-one had tested to compare spectra from neutral iron, i.e. iron in which all electrons are retained, with the unidentified emission lines in SN 2006gy, because iron is normally ionized (one or more electrons removed). We tried it and saw with excitement how line after line lined up just as in the observed spectrum," says Anders Jerkstrand, Department of Astronomy, Stockholm University.

"It became even more exciting when it quickly turned out that very large amounts of iron were needed to make the lines—at least a third of the Sun's mass—which directly ruled out some old scenarios and instead revealed a new one."


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  • (Score: 3, Interesting) by Anonymous Coward on Saturday January 25 2020, @06:34PM (1 child)

    by Anonymous Coward on Saturday January 25 2020, @06:34PM (#948545)

    A Ia supernova is essentially hydrogen powered, as the explosion is created by the hydrogen falling onto the star being subjected to enough gravity to trigger fusion.

    Hydrogen that hasn't actually fallen onto the white dwarf will not be under enough pressure and instead will just blow away. The high luminosity is not caused by fusion, but by more of the energy being absorbed by the surrounding material and re-emitted as light.

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  • (Score: 0) by Anonymous Coward on Sunday January 26 2020, @12:43AM

    by Anonymous Coward on Sunday January 26 2020, @12:43AM (#948676)

    I should point out though, that it's not hydrogen fusion, but rather carbon and oxygen, that actually produces most of the energy.