New study shows colliding neutron stars may unlock mysteries of universe expansion

July 08, 2020

ORLANDO, July 8, 2020 - The National Science Foundation's Arecibo Observatory in Puerto Rico has proven itself instrumental in another major astronomical discovery.

An international team of scientists, led by the University of East Anglia in the United Kingdom, found an asymmetrical double neutron star system using the facility's powerful radio telescope. This type of star system is believed to be a precursor to merging double neutron star systems like the one that LIGO (the Laser Interferometer Gravitational-Wave Observatory in the United States) discovered in 2017. The LIGO observation was important, because it confirmed the gravitational waves associated with merging neutron stars.

The work published by this team today in the journal Nature, indicates these specific kinds of double neutron star systems may be the key to understanding dead star collisions and the expansion of the universe.

"Back in 2017, scientists at LIGO first detected the merger of two neutron stars," says physicist Robert Ferdman, who led the team. "The event caused gravitational-wave ripples through the fabric of space time, as predicted by Albert Einstein over a century ago. It confirmed that the phenomenon of short gamma-ray bursts was due to the merger of two neutron stars."

One of the unique aspects of the 2017 discovery and today's is that the double neutron systems observed are composed of stars that have very different masses. Current theories about the 2017 discovery are based on the masses of stars being equal or very close in size.

"The double neutron star system we observed shows the most asymmetric masses amongst the known merging systems within the age of the universe," says Benetege Perera, a UCF scientist at Arecibo who co-authored the paper. "Based on what we know from LIGO and our study, understanding and characterizing of the asymmetric mass double neutron star population is vital to gravitational wave astronomy."

Perera, whose research is focused on pulsars and gravitational waves, joined the NSF-funded Arecibo Observatory in June 2019. The facility, which is managed by the University of Central Florida through a cooperative agreement with the NSF, offers scientists around the world a unique look into space because of its specialized instruments and its location near the equator.

The Discovery

The team discovered an unusual pulsar - one of deep space's magnetized spinning neutron-star 'lighthouses' that emits highly focused radio waves from its magnetic poles.

The newly discovered pulsar (known as PSR J1913+1102) is part of a binary system - which means that it is locked in a fiercely tight orbit with another neutron star.

"The Arecibo Observatory has a long legacy of important pulsar discoveries," says NSF Program Officer, Ashley Zauderer. "This exciting result shows how incredibly relevant the facility's unique sensitivity remains for scientific investigations in the new era of multi-messenger astrophysics."

Neutron stars are the dead stellar remnants of a supernova explosion. They are made up of the densest matter known - packing hundreds of thousands of times the Earth's mass into a sphere the size of a city like New York.

In about half a billion years the two neutron stars will collide, releasing astonishing amounts of energy in the form of gravitational waves and light.

That collision is what the LIGO team observed in 2017. The event was not surprising, but the enormous amount of matter ejected from the merger and its brightness was unexpected, Ferdman said.

"Most theories about this event assumed that neutron stars locked in binary systems are very similar in mass," Ferdman says. "But this newly discovered binary is unusual because the masses of its two neutron stars are quite different - with one far larger than the other. Our discovery changes these assumptions."

This asymmetric system gives scientists confidence that double neutron star mergers will provide vital clues about unsolved mysteries in astrophysics - including a more accurate determination of the expansion rate of the universe, known as the Hubble constant.
-end-
Other members on the discovery team are: P.C.C. Freire from the Max-Planck Institute f¨ur Radioastronomie in Germany, F. Camilo from the South African Radio Astronomy Observatory, J.M. Cordes from Cornell University, F. Crawrod from Franklin and Marshall College, J.W. T. Hessels from the University of Amsterdam and the Netherlands Institute for Radio Astronomy, V. M. Kaspi and E. Parent from McGill University, N. Pol from West Virginia University, I. H. Stairs from University of British Columbia. And J. van Leeuwen from the Netherlands Institute for Radio Astronomy.

Perera has multiple degrees including a doctorate in physics from West Virginia University. He's authored or co-authored dozens of peer-reviewed journal articles and presented at conferences around the world. He previously taught at the University of Manchester and was a summer scholar at Purdue University.

CONTACT: Zenaida Gonzalez Kotala, UCF Office of Research, Zenaida.kotala@ucf.edu UEA communications office on +44 (0)1603 593496 or communications@uea.ac.uk.

University of Central Florida

Related Science Articles from Brightsurf:

75 science societies urge the education department to base Title IX sexual harassment regulations on evidence and science
The American Educational Research Association (AERA) and the American Association for the Advancement of Science (AAAS) today led 75 scientific societies in submitting comments on the US Department of Education's proposed changes to Title IX regulations.

Science/Science Careers' survey ranks top biotech, biopharma, and pharma employers
The Science and Science Careers' 2018 annual Top Employers Survey polled employees in the biotechnology, biopharmaceutical, pharmaceutical, and related industries to determine the 20 best employers in these industries as well as their driving characteristics.

Science in the palm of your hand: How citizen science transforms passive learners
Citizen science projects can engage even children who previously were not interested in science.

Applied science may yield more translational research publications than basic science
While translational research can happen at any stage of the research process, a recent investigation of behavioral and social science research awards granted by the NIH between 2008 and 2014 revealed that applied science yielded a higher volume of translational research publications than basic science, according to a study published May 9, 2018 in the open-access journal PLOS ONE by Xueying Han from the Science and Technology Policy Institute, USA, and colleagues.

Prominent academics, including Salk's Thomas Albright, call for more science in forensic science
Six scientists who recently served on the National Commission on Forensic Science are calling on the scientific community at large to advocate for increased research and financial support of forensic science as well as the introduction of empirical testing requirements to ensure the validity of outcomes.

World Science Forum 2017 Jordan issues Science for Peace Declaration
On behalf of the coordinating organizations responsible for delivering the World Science Forum Jordan, the concluding Science for Peace Declaration issued at the Dead Sea represents a global call for action to science and society to build a future that promises greater equality, security and opportunity for all, and in which science plays an increasingly prominent role as an enabler of fair and sustainable development.

PETA science group promotes animal-free science at society of toxicology conference
The PETA International Science Consortium Ltd. is presenting two posters on animal-free methods for testing inhalation toxicity at the 56th annual Society of Toxicology (SOT) meeting March 12 to 16, 2017, in Baltimore, Maryland.

Citizen Science in the Digital Age: Rhetoric, Science and Public Engagement
James Wynn's timely investigation highlights scientific studies grounded in publicly gathered data and probes the rhetoric these studies employ.

Science/Science Careers' survey ranks top biotech, pharma, and biopharma employers
The Science and Science Careers' 2016 annual Top Employers Survey polled employees in the biotechnology, biopharmaceutical, pharmaceutical, and related industries to determine the 20 best employers in these industries as well as their driving characteristics.

Three natural science professors win TJ Park Science Fellowship
Professor Jung-Min Kee (Department of Chemistry, UNIST), Professor Kyudong Choi (Department of Mathematical Sciences, UNIST), and Professor Kwanpyo Kim (Department of Physics, UNIST) are the recipients of the Cheong-Am (TJ Park) Science Fellowship of the year 2016.

Read More: Science News and Science Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.