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Ghosts of ancient explosions live on in stars today

Dragon
Dragon
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Post by Dragon on Fri Jan 24, 2020 4:29 pm

When small, dense stars called white dwarfs explode, they produce bright, short-lived flares called Type Ia supernovae. These supernovae are informative cosmological markers for astronomers—for example, they were used to prove that the universe is accelerating in its expansion.

White dwarfs are not all the same, ranging from half of the mass of our sun to almost 50 percent more massive than our sun. Some explode in Type Ia supernovae; others simply die quietly.

Now, by studying the "fossils" of long-exploded white dwarfs, Caltech astronomers have found that early on in the universe, white dwarfs often exploded at lower masses than they do today. This discovery indicates that a white dwarf could explode from a variety of causes, and does not necessarily have to reach a critical mass before exploding.

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Ghosts of ancient explosions live on in stars today 334pu7m
Dragon
Dragon
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Post by Dragon on Fri Jan 24, 2020 4:30 pm

Ghosts of ancient explosions live on in stars today Ghostsofanci
Credit: Zwicky Transient Facility

Image of a Type Ia supernova.

Source / Image Courtesy


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Ghosts of ancient explosions live on in stars today 334pu7m
Dragon
Dragon
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Ghosts of ancient explosions live on in stars today Empty Re: Ghosts of ancient explosions live on in stars today

Post by Dragon on Fri Jan 24, 2020 4:31 pm



White dwarf star explosion into a Ia type supernova


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Ghosts of ancient explosions live on in stars today 334pu7m

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