The study, submitted in a paper to the Astrophysical Journal, provides the latest result from an Ohio State University galaxy survey underway with the Large Binocular Telescope, located in Arizona.
This Large Binocular Telescope image below of the Whirlpool Galaxy, otherwise known as M51, is part of a new galaxy survey by Ohio State University, where astronomers are searching for signs that stars are about to go supernova. The insets show one particular binary star system before (left) and after (right) one of its stars went supernova.
Credit: Image by Dorota Szczygiel, courtesy of Ohio State University.
In the first survey of its kind, the researchers have been scanning 25 nearby galaxies for stars that brighten and dim in unusual ways, in order to catch a few that are about to meet their end. In the three years since the study began, this particular unnamed binary system in the Whirlpool Galaxy was the first among the stars they've cataloged to produce a supernova.
The astronomers were trying to find out if there are patterns of brightening or dimming that herald the end of a star's life. Instead, they saw one star in this binary system dim noticeably before the other one exploded in a supernova during the summer of 2011.
Though they're still sorting through the data, it's likely that they didn't get any direct observations of the star that exploded – only its much brighter partner.
Yet, principal investigator Christopher Kochanek, professor of astronomy at Ohio State and the Ohio Eminent Scholar in Observational Cosmology, does not regard this first result as a disappointment. Rather, it's a proof of concept.
"Our underlying goal is to look for any kind of signature behavior that will enable us to identify stars before they explode," he said. "It's a speculative goal at this point, but at least now we know that it's possible."
"Maybe stars give off a clear signal of impending doom, maybe they don't," said study co-author Krzystof Stanek, professor of astronomy at Ohio State, "But we'll learn something new about dying stars no matter the outcome."
Postdoctoral researcher Dorota Szczygiel, who led the study of this supernova, explained why the galaxy survey is important.
"The odds are extremely low that we would just happen to be observing a star for several years before it went supernova. We would have to be extremely lucky," she said.
"With this galaxy survey, we're making our own luck. We're studying all the variable stars in 25 galaxies, so that when one of them happens go supernova, we've already compiled data on it." The supernova, labeled 2011dh, was first detected on May 31 and is still visible in telescopes. It originated from a binary star system in the Whirlpool Galaxy – also known as M51, one of the galaxies that the Ohio State astronomers have been observing for three years.
The system is believed to have contained one very bright blue star and one even brighter red star. From what the astronomers can tell, it's likely that the red star is the one that dimmed over the three years, before the blue star initiated the supernova.
When the Ohio State researchers reviewed the Large Binocular Telescope data as well as Hubble Space Telescope images of M51, they saw that the red star had dimmed by about 10 percent over three years, at a pace of three percent per year.
Szczygiel believes that the red star likely survived its partner's supernova.
"After the light from the explosion fades away, we should be able to see the companion that did not explode," she said.
As astronomers gather data from more supernovae – Kochanek speculates that as many as one per year could emerge from their data set – they could assemble a kind of litmus test to predict whether a particular star is near death. Whether it's going to spawn a supernova or shrink into a black hole, there may be particular signals visible on the surface, and this study has shown that those signals are detectable.
The team won't be watching our sun for any changes, however. At less than 10 percent of the mass of the star in supernova 2011dh, our star will most likely meet a very boring end.
"There'll be no supernova for our sun – it'll just fizzle out," Kochanek said. "But that's okay – you don't want to live around an exciting star."
This research was supported by the National Science Foundation.
The Large Binocular Telescope is an international collaboration among institutions in the United Sates, Italy, and Germany. The LBT Corporation partners are: the University of Arizona on behalf of the Arizona University System; the Instituto nazionale di Astrofisica, Italy; the LBT Beteiligungsesellschaft, Germany, representing the Max Planck Society, the Astrophysical Institute of Potsdam, and Heidelberg University; the Ohio State University; and the Research Corporation, on behalf of the University of Notre Dame, University of Minnesota, and University of Virginia.Contact: Christopher Kochanek, 614-292-5954; Kochanek.firstname.lastname@example.org.
Christopher Kochanek | EurekAlert!
Igniting a solar flare in the corona with lower-atmosphere kindling
29.03.2017 | New Jersey Institute of Technology
NASA spacecraft investigate clues in radiation belts
28.03.2017 | NASA/Goddard Space Flight Center
The Institute of Semiconductor Technology and the Institute of Physical and Theoretical Chemistry, both members of the Laboratory for Emerging Nanometrology (LENA), at Technische Universität Braunschweig are partners in a new European research project entitled ChipScope, which aims to develop a completely new and extremely small optical microscope capable of observing the interior of living cells in real time. A consortium of 7 partners from 5 countries will tackle this issue with very ambitious objectives during a four-year research program.
To demonstrate the usefulness of this new scientific tool, at the end of the project the developed chip-sized microscope will be used to observe in real-time...
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
29.03.2017 | Materials Sciences
29.03.2017 | Physics and Astronomy
29.03.2017 | Earth Sciences