Model 3 - D baru bisa memecahkan misteri supernova--T-REC-komunitas reptil-semarang--KSE-komunitas satwa eksotik

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Model 3 - D baru  bisa memecahkan misteri supernova

Date:

July 21, 2015

Source:

Michigan State University

Summary:

Para ilmuwan telah mengembangkan sebuah model 3 - D dari saat-saat terakhir bintang raksasa , pekerjaan yang bisa menjelaskan bagaimana bintang-bintang ini meledak .

............... Bagaimana bintang-bintang ini meledak masih menjadi misteri . Namun, karya terbaru yang dipimpin oleh Michigan State University dapat membawa beberapa jawaban untuk pertanyaan astronomi ini .

Dalam sebuah makalah yang diterbitkan dalam Astrophysical Journal Letters , tim dengan detail bagaimana mengembangkan model tiga dimensi saat-saat terakhir bintang raksasa .

" Ini adalah sesuatu yang belum pernah dilakukan sebelumnya , " kata Sean Couch ,  MSU asisten profesor fisika dan astronomi dan penulis utama . " Ini adalah langkah signifikan untuk memahami bagaimana bintang-bintang meledak. "....more

Seeing triple:
New 3-D model could solve supernova mystery

Date:

July 21, 2015

Source:

Michigan State University

Summary:

Scientists have developed a 3-D model of a giant star's last moments, work
that could shed light on how these stars explode.

................

Giant stars die a violent death. After a life of several million years,
they collapse into themselves and then explode in what is known as a supernova.

How these stars explode remains a mystery. However, recent work led by
Michigan State University may bring some answers to this astronomical question.

In a paper published in the Astrophysical Journal Letters, the
team details how it developed a three-dimensional model of a giant star's last
moments.

"This is something that has never been done before," said Sean
Couch, an MSU assistant professor of physics and astronomy and lead author of
the paper. "This is a significant step toward understanding how these
stars blow up."

The ongoing problem is that, until now, researchers have only been able to
do this in one-dimension. Nature, of course, is three-dimensional.

"We were always using one-D models that don't actually occur in
nature," Couch said.

What allowed the researchers to break the 3-D barrier is new developments
in technology. "There are new resources, both hardware and software, that
allow this to now be feasible," Couch said.

Until now, computer models did not match what was observed in the real
world.

"We just couldn't get the darn things to blow up," he said.
"And that was a problem because that's what happens in nature. It was
telling us that we were missing something."

The other problem the 3-D model addresses is the actual shape of the star.
Older computer models yielded stars that were perfectly spherical. However,
that is not what real stars look like, and this new work shows that the messy
details matter for understanding supernova explosions.

Millions of years of nuclear burning in massive stars results in central
cores made of inert iron. This iron cannot be used by the star as fuel.
Eventually, without any fuel source, the star collapses from its own tremendous
gravitational pull.

"This is what we see in our simulation process," Couch said.
"The iron core building up to where it can no longer support itself and
down it comes."

He said the development of the 3-D model is an early stop in pinning down
the reasons why stars explode, but could completely change the way scientists
approach the supernova mechanism.

Other members of the research team are Emmanouil Chatzopoulos of the University
of Chicago; W. David Arnett from the University of Arizona; and F.X. Timmes
from Arizona State University.

Couch and Timmes also are affiliated with the Joint Institute for Nuclear
Astrophysics, a National Science Foundation-funded center partly housed at MSU
which studies how the elements found throughout the universe first came to be.

Parts of this work also were carried out at the California Institute of
Technology prior to Couch joining MSU.







Story Source:

The above post is reprinted from materials provided byMichigan
State University. Note: Materials may be edited for content and length.







Journal Reference:

1.   
Sean M. Couch, Emmanouil Chatzopoulos, W. David Arnett, and F. X.
Timmes. The Three-Dimensional Evolution to Core Collapse of a Massive
Star. Astrophysical Journal Letters, 2015 DOI: 10.1088/2041-8205/808/1/L21

http://www.sciencedaily.com/releases/2015/07/150721124636.htm

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