Subscribe free to our newsletters via your
. 24/7 Space News .




STELLAR CHEMISTRY
Solving the riddle of neutron stars
by Staff Writers
Frankfurt, Germany (SPX) Mar 13, 2015


File image.

It has not yet been possible to measure the gravitational waves predicted by Einstein's theory of general relativity. They are so weak that they get lost in the noise of the measurements. But thanks to the latest simulations of the merging of binary neutron star systems, the structure of the sought-after signals is now known.

As a team of German and Japanese theoretical astrophysicists reports in the Editor's choice of the current edition of the scientific journal "Physical Review D", gravitational waves have a characteristic spectrum that is similar to the spectral lines of atoms.

Gravitational waves are generated when masses accelerate. The first indirect evidence for their existence was detected in 1974 when the binary pulsar PSR B1913+16 was discovered in the constellation Aquila. The two rapidly rotating neutron stars are drifting towards each other in a spiral shape, which is why, the astrophysicists explain, they are losing energy and emitting gravitational waves.

Russell A. Hulse and Joseph H. Taylor received the 1993 Nobel Prize in Physics for this discovery. In the meantime, there are now several large-scale experiments for detecting gravitational waves: the American LIGO experiment, the European Virgo experiment, and the Japanese KAGRA detector. Experts estimate that signals of gravitational waves from merging binary neutron star systems will be detected within the next five years.

"These signals are not easy to detect, because they have an extremely small amplitude." But despite these difficult conditions, it is possible to find them, if you know what to look for in advance," explained Professor Luciano Rezzolla from the Institute for Theoretical Physics at Goethe University.

Together with a Japanese colleague from Osaka University, he has studied a number of binary neutron star systems with the help of the latest simulation techniques and has discovered that the merging of the stars generates characteristic gravitational wave spectra.

"These spectra correspond, at least logically, to the electromagnetic spectral lines emitted by atoms or molecules. From these we can derive information on the characteristics of the stars," explains Rezzolla.

As the astrophysicists show in two publications with related content in "Physical Review Letters" (published in November 2014) and in the current edition of "Physical Review D," the gravitational waves spectrum is like a fingerprint for the two stars. If scientists learn how to interpret these spectra, they will know what the neutron stars are made of and will be able to determine what is their equation of state, which is so far unknown.

Equations of state describe the thermodynamic properties of systems as a function of variables, such as pressure, temperature, volume, or particle number. To this Rezzolla adds: "This is a very exciting possibility, because then we would be able to solve a riddle that has remained unsolved for 40 years: What are neutron stars made of and what is their stellar structure?"

"If the signal is strong and thus the fingerprint is very clear, even a single measurement would be sufficient," Rezzolla predicts.

"The prospects of solving the riddle of neutron stars have never been this good. The gravitational waves that we hope to detect in a few years are already on their way from the farthest reaches of the universe."

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

.


Related Links
Goethe University Frankfurt
Stellar Chemistry, The Universe And All Within It






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





STELLAR CHEMISTRY
Carina Nebula survey reveals details of star formation
Houston TX (SPX) Mar 11, 2015
A new Rice University-led survey of one of the most active star-forming regions in the galactic neighborhood is helping astronomers better understand the processes that may have contributed to the formation of the sun 4.5 billion years ago. The survey of Carina Nebula is available online in the Astronomical Journal. "Most stars form in giant molecular clouds, regions where the density of m ... read more


STELLAR CHEMISTRY
China Gets One Step Closer to Completing its Ambitious Lunar Mission

Billionaire Teams Up with NASA to Mine the Moon

Core work: Iron vapor gives clues to formation of Earth and moon

Application of laser microprobe technology to Apollo samples refines lunar impact history

STELLAR CHEMISTRY
Mystery Giant Mars Plumes Still Unexplained

Have you ever used a camera on board an interplanetary spacecraft

Taking a Closer Look at Purple-Bluish Rock Formation

Use of Rover Arm Expected to Resume in a Few Days

STELLAR CHEMISTRY
Intergalactic GPS Will Guide You through the Stars

Planetary Society Announces Test Flight for Privately Funded LightSail Spacecraft

Space soprano plans first duet from ISS

Orion's Launch Abort System Motor Exceeds Expectations

STELLAR CHEMISTRY
China has ability but no plan for manned lunar mission: expert

Tianzhou-1 cargo ship to dock with space lab in 2016

China's test spacecraft simulates orbital docking

China's Space Laboratory Still Cloaked

STELLAR CHEMISTRY
Testing astronauts' lungs in Space Station airlock

Astronauts return to Earth on Russian Soyuz spaceship

International Space Station 'Lost' Without Russia Says NASA Chief

US astronauts speed through spacewalk at orbiting lab

STELLAR CHEMISTRY
THOR 7 being fueled for Arianespace's dual-payload April mission

Arianespace wins SES-15 launch contract

45th Space Wing unveils multi-vehicle launch support center

Soyuz Installed at Baikonur, Expected to Launch Wednesday

STELLAR CHEMISTRY
'Habitable' planet GJ 581d previously dismissed as noise probably does exist

Scientists: Nearby Earth-like planet isn't just 'noise'

Exorings on the Horizon

Planet 'Reared' by Four Parent Stars

STELLAR CHEMISTRY
Spaceflight Industries Raises $20 Million to Accelerate Growth

Understanding The Electromagnetic Environmental Effects On Space Systems

German govt okays bill to boost electronic appliance recyling

Google gearing Android for virtual reality: report




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.