Christian Ott
Petascale Simulations of Core-Collapse Supernovae and Hypermassive Neutron Stars
(jr6)Sep 2016 - Aug 2017
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Philipp Moesta: Modeling Hyperenergetic and Superluminous Core-collapse Supernovae
Blue Waters Symposium 2017, May 17, 2017
Sun and Hypernovae: Computer Simulation Opens Up Inner World
Dec 14, 2015
The process behind some of the most powerful explosions in the universe has long remained somewhat of a mystery to scientists, but the inner workings of such phenomena have just come one step closer to full visibility, thanks to computer simulation. ... The computer simulation took place over the course of two weeks on the Blue Waters supercomputer, which is located at the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign. The simulation indicated that a turbulence-driven dynamo may lie at the core of hypernovae, according to a statement.
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- http://www.natureworldnews.com/articles/18753/20151214/sun-hypernovae-computer-simulation-opens-up-inner-world.htm
- http://www.hngn.com/articles/155563/20151201/supercomputer-simulation-shows-what-truly-happens-when-stars-die-burst.htm
Simulation Sees Supernova Innards
Dec 8, 2015
It’s hard to make a star explode. Within Blue Waters, one of the most powerful supercomputers in the world, 130,000 computer processors worked around the clock for 18 days to simulate the supernova of a star six times the Sun’s mass. The result? 10 milliseconds of swirling gas that gives an all-too-brief window into the magnetic mechanics of stellar blasts.
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Unveiling the turbulent times of a dying star
Dec 1, 2015
All the stars in the sky will eventually die — and some will really go out with a bang. When a dying star goes supernova, it explodes with such ferocity that it outshines the entire galaxy in which it lived, spewing material and energy across unimaginable distances at near-light speed. ... Understanding how these jets are created is a vexing challenge, but an international research team has recently employed powerful computer simulations to sleuth out some answers. The team — led by Phillip Mösta (NASA Einstein Fellow at UC Berkeley), with Caltech researchers Christian Ott, David Radice and Luke Roberts, Perimeter Institute computational scientist Erik Schnetter, and Roland Haas of the Max-Planck Institute for Gravitational Physics — published their findings on 30 November in Nature.
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Missing Link Found Between Turbulence In Collapsing Star And Hypernova, Gamma-ray Burst
Nov 30, 2015
A supercomputer simulation of a mere 10 milliseconds in the collapse of a massive star into a neutron star proves that these catastrophic events, often called hypernovae, can generate the enormous magnetic fields needed to explode the star and fire off bursts of gamma rays visible halfway across the universe. The results of the simulation, published online Nov. 30 in advance of publication in the journal Nature, demonstrate that as a rotating star collapses, the star and its attached magnetic field spin faster and faster, forming a dynamo that revs the magnetic field to a million billion times the magnetic field of Earth.
Sources:
- http://www.ecnmag.com/news/2015/11/missing-link-found-between-turbulence-collapsing-star-and-hypernova-gamma-ray-burst
- http://phys.org/news/2015-11-link-turbulence-collapsing-star-hypernova.html
Simulation Shows Key to Building Powerful Magnetic Fields
Nov 30, 2015
When certain massive stars use up all of their fuel and collapse onto their cores, explosions 10 to 100 times brighter than the average supernova occur. Exactly how this happens is not well understood. Astrophysicists from Caltech, UC Berkeley, the Albert Einstein Institute, and the Perimeter Institute for Theoretical Physics have used the National Science Foundation's Blue Waters supercomputer to perform three-dimensional computer simulations to fill in an important missing piece of our understanding of what drives these blasts.
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2015 Blue Waters Symposium highlights successes, looks to the future of supercomputing
May 29, 2015
The 2015 Blue Waters Symposium, held May 10-13 at Oregon's beautiful Sunriver Resort, brought together leaders in petascale computational science and engineering to share successes and methods. Around 130 attendees, many of whom were Blue Waters users and the NCSA staff who support their work, enjoyed presentations on computational advances in a range of research areas—including sub-atomic physics, weather, biology, astronomy, and many others—as well as keynotes from innovative thinkers and leaders in high-performance computing. Over the three days of the symposium, 58 science teams from across the country presented on their work on Blue Waters.
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NSF awards time on Blue Waters to seven new projects
Oct 1, 2014
The National Science Foundation (NSF) has awarded 14 new allocations on the Blue Waters petascale supercomputer at the National Center for Supercomputing Applications (NCSA) at the University of Illinois at Urbana-Champaign. Seven of the awards are for new projects.
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3D Simulations Raise Bar for Astrophysics
Jul 3, 2014
For those outside the HPC/science realm who question why there need to be ever-more powerful supercomputers, one need only look at the amazing breakthroughs that the petascale age has facilitated. Astrophysics research out of Caltech is the latest example. Because of leadership-class systems like Stampede and Blue Waters and their experienced support staff, researchers from Caltech were able to perform fully 3D model simulations of supernova explosions.
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XSEDE and Blue Waters go supernova
Jul 2, 2014
If you were to go back far enough into the Earth’s cosmic ancestry, you might be surprised to find it all started with a supernova explosion. These explosive cosmic events are like laboratories in space, generating elements that enable the creation of life later on; in fact, most of what makes up the Earth, including us humans, evolved from these fundamental elements. This is why simulating the process of a star going supernova is so important—it could potentially be the key to unlocking some of the bigger mysteries of how we came to be in the universe. Philipp Mösta, postdoctoral scholar at Caltech, Christian D. Ott, professor of astrophysics at Caltech, and fellow researchers working with Peter Diener, research professor at the Center for Computation and Technology of Louisiana State University, are studying extreme core-collapse supernovae. These events make up only one percent of all supernovae that are observed but are the most extreme in terms of the energy emitted into the universe.
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