Space

March 20, 2013

Famous supernova reveals clues about crucial cosmic distance markers

A new study using data from NASA’s Chandra X-ray Observatory points to the origin of a famous supernova. This supernova, discovered in 1604 by Johannes Kepler, belongs to an important class of objects that are used to measure the rate of expansion of the universe.

Astronomers have used a very long Chandra observation of the remnant of Kepler’s supernova to deduce that the supernova was triggered by an interaction between a white dwarf and a red giant star. This is significant because another study has already shown that a so-called Type Ia supernova caused the Kepler supernova remnant.

The thermonuclear explosion of a white dwarf star produces such supernovas. Because they explode with nearly uniform brightness, astronomers have used them as cosmic distance markers to track the accelerated expansion of the universe.

However, there is an ongoing controversy about Type Ia supernovas. Are they caused by a white dwarf pulling so much material from a companion star that it becomes unstable and explodes? Or do they result from the merger of two white dwarfs?

“While we can’t speak to all Type Ia supernovas, our evidence points to Kepler being caused by a white dwarf pulling material from a companion star, and not the merger of two white dwarfs,” said the first author of the new Chandra study, Mary Burkey of North Carolina State University. “To continue improving distance measurements with these supernovas, it is crucial to understand how they are triggered.”

The Kepler supernova remnant is one of only a few Type Ia supernovas known to have exploded in the Milky Way galaxy. Its proximity and its identifiable explosion date make it an excellent object to study.

“Johannes Kepler made such good naked-eye observations in 1604 that we can identify the supernova as Type Ia,” said co-author Stephen Reynolds, also of NCSU. “He would be thrilled that we can use today’s terrific instruments to reveal the hidden secrets of his supernova.”

The new Chandra images reveal a disk-shaped structure near the center of the remnant. The researchers interpret this X-ray emission to be caused by the collision between supernova debris and disk-shaped material that the giant star expelled before the explosion. Another possibility is that the structure is just debris from the explosion.

The evidence that this disk-shaped structure was left behind by the giant star is two-fold: first, a substantial amount of magnesium — an element not produced in great amounts in Type Ia supernovas – was found in the Kepler remnant. This suggests the magnesium came from the giant companion star.

Secondly, the disk structure seen by Chandra in X-rays bears a remarkable resemblance in both shape and location to one observed by the Spitzer Space Telescope. These infrared-emitting disks are thought to be dusty bands expelled by stars in a wind, rather than material ejected in a supernova.

The researchers found a remarkably large and puzzling concentration of iron on one side of the center of the remnant but not the other. The authors speculate that the cause of this asymmetry might be the “shadow” in iron that was cast by the companion star, which blocked the ejection of material. Previously, theoretical work has suggested this shadowing is possible for Type Ia supernova remnants.

“One remaining challenge is to find the damaged and fast-moving leftovers of the giant star that was pummeled by the explosion at close quarters,” said co-author Kazimierz Borkowski, also of NCSU.

Much of the evidence in the last several years has favored the white dwarf merger scenario for Type Ia supernovas within the Milky Way as well as those found in other galaxies. This result strengthens the case that Type Ia supernovas may have more than one triggering mechanism.

These results could imply that many Type Ia supernovas have a similar origin, but the authors warn that they are unsure whether Kepler was a typical explosion. For example, a recent analysis based on Chandra data and computer simulations, led by Daniel Patnaude from Harvard-Smithsonian Center for Astrophysics, has suggested that Kepler was an unusually powerful explosion.

“We could settle the issue of how normal — or abnormal — the Kepler supernova was if we could discover some light from the supernova explosion that just happened to bounce off some interstellar dust to take a few hundred extra years to get here: a light echo,” said Reynolds. Such light echoes have been found for two other galactic supernovas in the last millennium.

These results were published online and in the February 10, 2013, issue of The Astrophysical Journal [http://iopscience.iop.org/0004-637X/764/1/63]. The other co-author is John Blondin, also from NCSU.

 

NASA’s Marshall Space Flight Center in Huntsville, Ala., manages the Chandra program for NASA’s Science Mission Directorate in Washington. The Smithsonian Astrophysical Observatory controls Chandra’s science and flight operations from Cambridge, Mass.

 




All of this week's top headlines to your email every Friday.


 
 

 

Headlines May 6, 2015

News: President nominates Gen. Joseph F. Dunford as Joint Chiefs chairman - President Obama nominated Marine Corps Gen. Joseph F. Dunford May 5 as chairman of the Joint Chiefs of Staff, calling the commander of troops in Iraq and Afghanistan “a proven leader.”   Business: U.S. Air Force says may revisit rocket plan if firms do...
 
 

News Briefs May 6, 2015

NATO to briefly move command headquarters A top NATO commander says the alliance will briefly move an allied joint force command headquarters to Romania as NATO continues to hone its ability to react to Russia’s moves in Ukraine and other security challenges. U.S Navy Adm. Mark E. Ferguson III, commander of the Allied Joint Force...
 
 
Boeing photograph

Australia accepts new Boeing CH-47F Chinook aircraft

Boeing photograph Boeing has delivered the first two of seven CH-47F Chinooks to the Australian Army at a ceremony in Queensland. The remaining aircraft will be delivered throughout 2015. At a May 5 ceremony at Royal Australian...
 

 
Northrop Grumman photograph

RQ-4 Global Hawk achieves milestone C

Northrop Grumman photograph A U.S. Air Force RQ-4 Global Hawk on a runway in Palmdale, Calif. The U.S. Air Force RQ-4 Global Hawk high altitude, long endurance autonomous unmanned aircraft system successfully completed Mileston...
 
 
Army photograph by Maj. Daniel Markert

‘Futurist’ predicts Far East challenges for expeditionary Army

Army photograph by Maj. Daniel Markert Soldiers will face anti-satellite operations and electronic warfare in the future, predicted Dr. Andrew F. Krepinevich Jr., president of the Center for Strategic and Budgetary Assessments,...
 
 

Boeing upgrading Australian F/A-18 trainers to aid maintenance effectiveness

Boeing will update two maintenance trainers for the Royal Australian Air Force so they better support the RAAFís F/A-18F and EA-18G aircraft. Australia is the only nation other than the United States flying F/A-18 Super Hornet fighters and EA-18G Growler airborne electronic attack aircraft. While it operates the two-seat F variant of the Super Hornet,...
 




0 Comments


Be the first to comment!


Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>