{"id":70961,"date":"2019-05-02T17:07:11","date_gmt":"2019-05-02T22:07:11","guid":{"rendered":"https:\/\/uwm.edu\/news\/?p=70961"},"modified":"2019-05-06T10:55:31","modified_gmt":"2019-05-06T15:55:31","slug":"ligo-and-virgo-detect-second-neutron-star-smash-up","status":"publish","type":"post","link":"https:\/\/uwm.edu\/news\/ligo-and-virgo-detect-second-neutron-star-smash-up\/","title":{"rendered":"LIGO and Virgo detect second neutron star smash-up"},"content":{"rendered":"

Nearly two years after a detecting gravitational waves from a neutron star collision, three detectors \u2013 the Laser Interferometer Gravitational-Wave Observatory and the European-based Virgo detector \u2013 have found waves from two other such sources.<\/p>\n

The gravitational waves detected April 25 also appear to be from a crash between two neutron stars \u2014 the dense remnants of massive stars that previously exploded. Then, on April 26, the LIGO-Virgo network spotted another candidate wave-source with a potentially interesting twist: It may, in fact, have resulted from the collision of a neutron star and black hole, an event never before witnessed.<\/p>\n

\u201cThe universe is keeping us on our toes,\u201d says Patrick Brady, spokesperson for the LIGO Scientific Collaboration and a professor of physics at the University of Wisconsin-Milwaukee.<\/p>\n

\u201cWe’re especially curious about the April 26 candidate. Unfortunately, the signal is rather weak. It’s like listening to somebody whisper a word in a busy caf\u00e9; it can be difficult to make out the word or even to be sure that the person whispered at all. It will take some time to reach a conclusion about this candidate.\u201d<\/p>\n

Realizing potential<\/h3>\n

With these new discoveries, the LIGO-Virgo collaborations are realizing their potential of regularly producing discoveries that were once impossible, National Science Foundation Director France Cordova said.<\/p>\n

The discoveries come just weeks after LIGO and Virgo turned back on<\/a>. The twin detectors of LIGO \u2014 one in Washington state and one in Louisiana \u2014 along with Virgo, located in Italy, resumed operations April 1, after undergoing a series of upgrades to increase their sensitivities to gravitational waves \u2014 ripples in space and time.<\/p>\n

Each detector now surveys larger volumes of the universe than before, searching for extreme events such as smash-ups between black holes and neutron stars.<\/p>\n

In addition to the two new candidates involving neutron stars, the LIGO-Virgo network has, in this latest run, spotted three likely black hole mergers. In total, since making history with the first-ever direct detection of gravitational waves<\/a> in 2015, the network has spotted evidence for two neutron star mergers, 13 black hole mergers and one possible black hole-neutron star merger.<\/p>\n

\u201cWith these observations we are performing a census of the black hole and neutron star binaries in the universe,\u201d said Jolien Creighton, 51ÁÔÆæ professor of physics. \u201cThis census will give us new insight into how massive stars live and die, the origin of heavy elements, the expansion of the cosmos, and it will allow us to perform unique tests of Einstein\u2019s theory of gravity.\u201d<\/p>\n

Tremendous impacts<\/h3>\n

When two black holes collide, they warp the fabric of space and time, producing gravitational waves. When two neutron stars collide, they send out not only gravitational waves but also light. That means telescopes sensitive to light waves across the electromagnetic spectrum can witness these fiery impacts together with LIGO and Virgo.<\/p>\n

One such event occurred in August 2017<\/a>: LIGO and Virgo initially spotted a neutron star merger in gravitational waves and then, in the days and months that followed, about 70 telescopes on the ground and in space witnessed the explosive aftermath in light waves, including everything from gamma rays to optical light to radio waves.<\/p>\n

In the case of the two recent neutron star candidates, telescopes around the world once again raced to track the sources and pick up the light expected to arise from these mergers. Hundreds of astronomers eagerly pointed telescopes at patches of sky suspected to house the signal sources. However, at this time, neither of the sources has been pinpointed.<\/p>\n

Finding the locations of these events soon after the gravitational waves are detected offers scientists the opportunity to gain more information about violent events in the cosmos.<\/p>\n

\u201cEven with all of the planning and preparation that we did following the first double neutron star detection, fantastic new telescopes and truly staggering non-stop efforts by astronomers around the world, we couldn\u2019t identify a likely signal,\u201d said David Kaplan, 51ÁÔÆæ associate professor of physics. \u201cBut we are even more excited for the discoveries to come.\u201d<\/p>\n

Difficult to find<\/h3>\n

The search for explosive counterparts of the gravitational-wave signal is challenging because of the amount of sky that must be covered and the rapid changes in brightness that are expected, the astronomers said.<\/p>\n

The April 25 neutron star smash-up, dubbed S190425z, is estimated to have occurred about 500 million light-years away from Earth. Only one of the twin LIGO facilities picked up its signal along with Virgo (the LIGO detector in Washington state was offline). Because only two of the three detectors registered the signal, estimates of the location in the sky from which it originated were not precise, leaving astronomers to survey nearly one-quarter of the sky for the source.<\/p>\n

The possible April 26 neutron star-black hole collision (referred to asS190426c) is estimated to have taken place roughly 1.2 billion light-years away. It was detected by all three LIGO-Virgo facilities, which helped better narrow its location to regions covering about 1,100 square degrees, or about three percent of the total sky.<\/p>\n

Researchers at 51ÁÔÆæ are part of the LIGO Scientific Collaboration, an international consortium of 70 institutions and hundreds of researchers. The 51ÁÔÆæ team developed the analytical framework and the computational tools<\/a> to make LIGO\u2019s discoveries possible.<\/p>\n","protected":false},"excerpt":{"rendered":"

Nearly two years after a detecting gravitational waves from a neutron star collision, three detectors have found waves from two other such sources. 51ÁÔÆæ researchers are an integral part of the effort. <\/p>\n","protected":false},"author":836,"featured_media":70995,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","uwm_wg_additional_authors":[]},"categories":[174,175],"tags":[],"section":[140,139],"display_categories":[115,116],"related-coverage":[],"uwmnews-feed":[158],"class_list":["post-70961","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-research","section-science","section-science-technology","display_categories-top-story-secondary","display_categories-top-story-section","uwmnews-feed-letters-science"],"yoast_head":"\nLIGO and Virgo detect second neutron star smash-up<\/title>\n<meta name=\"description\" content=\"Nearly two 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