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A Star Escaped a Supernova Explosion, and NASA Snapped its Picture

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sn 2001ig supernova explosion and images of its stars

Scientists recently spotted the lone survivor of a supernova explosion.

 

NASA recently announced that it detected a star that escaped from a supernova explosion. Called SN 2001ig, this took place in a galaxy of the constellation Grus.

Located about 40 million light-years from Earth, the star escaped from the explosion of its binary companion. Most large stars are binary, according to Stuart Ryder of the Australian Astronomical Observatory. A “survivor” like this has never before been detected.

The Lone Survivor of the Supernova Explosion

 

According to research from NASA, the two stars of this binary system orbited each other over the course of about a year. However, in the process, the surviving star was siphoning off the hydrogen from its neighbor’s stellar envelope, which helped bring about the supernova explosion.

That makes SN 2001ig a Type IIb supernova, or a stripped-envelope supernova. Until now, scientists were not sure how such stars lost their outer envelopes. The presumed culprit were and still are powerful stellar winds.

Notably, researchers have had a hard time finding primary stars that undergo this process. Primary stars are space bodies that do not have binary companions.
“That was especially bizarre because astronomers expected that they would be the most massive and the brightest progenitor stars,” said Space Telescope Science Institute researcher Ori Fox.

He also noted that the number of Type IIb supernovae is higher than predicted. According to a new theory, published in the March 28 issue of The Astrophysical Journal, up to half of Type IIb supernovae may be binary stars. Also, the remaining ones might lose their envelopes due to the aforementioned stellar winds.

Both the European Southern Observatory and the Gemini South Observatory in Chile spotted SN 2001ig and its escapee.

The surviving star was also not easy to photograph. Being very faint, it would have been invisible to the Hubble Space Telescope had it been a few more light-years away.
Image Source: Wikimedia

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