Featured Research

from universities, journals, and other organizations

Stability lost as supernovae explode

Date:
May 15, 2014
Source:
Springer Science+Business Media
Summary:
Exploding supernovae are a phenomenon that is still not fully understood. The trouble is that the state of nuclear matter in stars cannot be reproduced on Earth. Scientists have now developed a new model of supernovae represented as dynamical systems subject to a loss of stability, just before they explode. Because similar stability losses also occur in dynamical systems in nature, this model could be used to predict natural catastrophes before they happen.

Gamma-rays detected by Fermi's LAT show that the remnant of Tycho's supernova shines in the highest-energy form of light. This portrait of the shattered star includes gamma rays (magenta), X-rays (yellow, green, and blue), infrared (red) and optical data.
Credit: Gamma ray, NASA/DOE/Fermi LAT Collaboration; X-ray, NASA/CXC/SAO; Infrared, NASA/JPL-Caltech; Optical, MPIA, Calar Alto, O. Krause et al. and DSS

Exploding supernovae are a phenomenon that is still not fully understood. The trouble is that the state of nuclear matter in stars cannot be reproduced on Earth. In a recent paper published in EPJ E, Yves Pomeau from the University of Arizona, USA, and his French colleagues from the CNRS provide a new model of supernovae represented as dynamical systems subject to a loss of stability, just before they explode.

Related Articles


Because similar stability losses also occur in dynamical systems in nature, this model could be used to predict natural catastrophes before they happen. Previous studies of the creeping of soft solids, earthquakes, and sleep-wake transitions have already confirmed the validity of this approach.

The authors show that the stars' loss of stability can be described in mathematical terms as a so-called dynamical saddle-node bifurcation. This approach makes it possible to devise a universal equation describing supernovae dynamics at its onset, taking into account the initial physical conditions of stability.

Unlike previous studies, this one sheds light on why the time scale of a supernova explosion-lasting between ten and thirty seconds-is considerably shorter than the overall pace of evolution of the star, in the billion year range.

This study also attempts to elucidate whether supernova explosions are genuine and do not result from a reversed implosion. Indeed, supernovae are believed to be initially subjected to an inward flow-as the star's core may collapse into a neutron star or a black hole-that is subsequently superseded by the violent outward flow of the supernova explosion. The authors attempt to explain this phenomenon through a detailed model, demonstrating that the star enters a global free fall following its loss of stability.


Story Source:

The above story is based on materials provided by Springer Science+Business Media. Note: Materials may be edited for content and length.


Journal Reference:

  1. Yves Pomeau, Martine Le Berre, Pierre-Henri Chavanis, Bruno Denet. Supernovae: An example of complexity in the physics of compressible fluids. The European Physical Journal E, 2014; 37 (4) DOI: 10.1140/epje/i2014-14026-1

Cite This Page:

Springer Science+Business Media. "Stability lost as supernovae explode." ScienceDaily. ScienceDaily, 15 May 2014. <www.sciencedaily.com/releases/2014/05/140515090813.htm>.
Springer Science+Business Media. (2014, May 15). Stability lost as supernovae explode. ScienceDaily. Retrieved April 1, 2015 from www.sciencedaily.com/releases/2014/05/140515090813.htm
Springer Science+Business Media. "Stability lost as supernovae explode." ScienceDaily. www.sciencedaily.com/releases/2014/05/140515090813.htm (accessed April 1, 2015).

Share This


More From ScienceDaily



More Space & Time News

Wednesday, April 1, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

The Universe Could Be Full Of Tatooine Sunsets

The Universe Could Be Full Of Tatooine Sunsets

Newsy (Mar. 30, 2015) University of Utah researchers say mathematical simulations show small, rocky planets, like Tatooine from "Star Wars," can form in dual-star systems. Video provided by Newsy
Powered by NewsLook.com
What NASA Wants To Learn From Its 'Year In Space' Tests

What NASA Wants To Learn From Its 'Year In Space' Tests

Newsy (Mar. 28, 2015) Astronaut Scott Kelly and cosmonaut Mikhail Kornienko will spend a year in space running tests on human physiology and psychology. Video provided by Newsy
Powered by NewsLook.com
Raw: Astronauts Arrive at ISS for 1-Year Mission

Raw: Astronauts Arrive at ISS for 1-Year Mission

AP (Mar. 28, 2015) The capsule carrying a Russian and an American who are to spend a year away from Earth docked Saturday with the International Space Station. (March 28) Video provided by AP
Powered by NewsLook.com
Crew Starts One-Year Space Mission

Crew Starts One-Year Space Mission

Reuters - News Video Online (Mar. 28, 2015) Russian-U.S. crew arrives safely at the International Space Station for the start of a ground-breaking year-long stay. Paul Chapman reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins