{"id":119910,"date":"2019-05-07T21:42:57","date_gmt":"2019-05-07T21:42:57","guid":{"rendered":"https:\/\/www.bnreport.com\/ligo-is-on-the-lookout-for-these-8-sources-of-gravitational-waves\/"},"modified":"2019-05-07T21:42:57","modified_gmt":"2019-05-07T21:42:57","slug":"ligo-is-on-the-lookout-for-these-8-sources-of-gravitational-waves","status":"publish","type":"post","link":"https:\/\/www.bnreport.com\/en\/ligo-is-on-the-lookout-for-these-8-sources-of-gravitational-waves\/","title":{"rendered":"LIGO is on the lookout for these 8 sources of gravitational waves"},"content":{"rendered":"<p>Seekers of gravitational waves are on a cosmic scavenger hunt.<\/p>\n<p>Since the Advanced Laser Interferometer Gravitational-wave Observatory turned on in 2015, physicists have caught these ripples in spacetime from several exotic gravitational beasts \u2014 and scientists want more.<\/p>\n<p>This week, LIGO and its partner observatory Virgo announced <a href=\"https:\/\/www.sciencenews.org\/article\/ligo-virgo-made-5-likely-gravitational-wave-detections-month?tgt=nr\" rel=\"noreferrer noopener\" target=\"_blank\">five new possible gravitational wave detections in a single month<\/a>, making what was once a decades-long goal almost commonplace (<em>SN Online: 5\/2\/19<\/em>).<\/p>\n<p>\u201cWere just beginning to see the field of gravitational wave astronomy open,\u201d LIGO spokesperson Patrick Brady from the University of Wisconsin\u2013Milwaukee said May 2 in a news conference. \u201cOpening up a new window on the universe like this will hopefully bring us a whole new perspective on whats out there.\u201d<\/p>\n<p>The speed and pitch of gravitational wave signals allow astronomers to make out whats stirring up the waves. Here are the sources of gravitational waves that scientists that already have in their nets, and what theyre still hoping to find.<\/p>\n<h4><strong>1. Pairs of colliding black holes<\/strong>[hhmc]<br \/>\n<\/h4>\n<p><strong>Status: Found<\/strong><\/p>\n<p>LIGOs <a href=\"https:\/\/www.sciencenews.org\/article\/gravity-waves-black-holes-verify-einsteins-prediction\" rel=\"noreferrer noopener\" target=\"_blank\">first catch was a pair of colliding black holes<\/a>, each around 30 times the mass of the sun (<em>SN: 3\/5\/16, p. 6<\/em>). The experiment detected vibrations from the merging black holes on September 14, 2015, four days before the official start of observations for the freshly upgraded LIGO.<\/p>\n<p>That first discovery proved that massive, moving objects do in fact shake spacetime to produce gravitational waves, as Einstein predicted a century earlier. Not only that, the find proved that experiments on Earth could detect those waves, something of which Einstein was skeptical. Three of LIGOs founders were awarded the <a href=\"https:\/\/www.sciencenews.org\/article\/trio-wins-physics-nobel-prize-gravitational-wave-detection\" rel=\"noreferrer noopener\" target=\"_blank\">Nobel Prize in physics in 2017<\/a> for the detection (<em>SN: 10\/28\/17, p. 6<\/em>).<\/p>\n<p>In total, LIGO and Virgo have detected gravitational waves from 10 confirmed pairs of colliding black holes, plus another three candidates netted in the last month.<\/p>\n<h4><strong>2. Pairs of colliding neutron stars<\/strong>[hhmc]<br \/>\n<\/h4>\n<p><strong>Status: Found<\/strong><\/p>\n<p>It was thought that a pair of merging neutron stars, the dense stellar corpses of massive stars that died in a supernova, could also set off gravitational waves. Then, in <a href=\"https:\/\/www.sciencenews.org\/article\/neutron-star-collision-gravitational-waves?mode=pick&amp;context=2783\" rel=\"noreferrer noopener\" target=\"_blank\">August 2017<\/a>, the LIGO-Virgo team caught the first known instance of such an event, and a second on April 25 (<em>SN: 11\/11\/17, p. 6<\/em>).<\/p>\n<table>\n<tbody>\n<tr>\n<td>[youtube https:\/\/www.youtube.com\/watch?v=_SQbaILipjY?rel=0]<\/td>\n<\/tr>\n<tr>\n<td>\nCOSMIC CHIRP Gravitational waves are analogous to sound waves. If human ears could hear the waves created by a pair of colliding neutron stars, they would sound like a low rumble as the neutron stars circled each other. Then, the sound would increase in pitch as the stars drew closer and closer, culminating in a faint \u201cchirp\u201d as the objects merged (around 29 seconds).\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Max Planck Institute for Gravitational Physics<\/p>\n<p>Follow-up observations with telescopes that are sensitive to light across the electromagnetic spectrum revealed hidden details of that first neutron star crash, including that the collision forged precious elements like gold, silver and platinum.<\/p>\n<h4><strong>3. A neutron star crashing into a black hole<\/strong>[hhmc]<br \/>\n<\/h4>\n<p>Status: Maybe<\/p>\n<p>Another type of merger that could spawn ripples in spacetime is like the chocolate-vanilla swirl at an ice cream stand: one black hole and one neutron star merging into a single object. The observatories saw a possible signature of this kind of merger on April 26, but the signal was too weak for scientists to be sure.<\/p>\n<p>If the team confirms that that signal really represents a black hole and neutron star swirl, it would prove that the two kinds of objects can live side by side. Before merging, the black hole and neutron star would have had to orbit each other in a close binary system.<\/p>\n<p>\u201cWed be surprised if they didnt exist, but we havent seen one\u201d of these combinations, says LIGO team member Christopher Berry of Northwestern University in Evanston, Ill.<\/p>\n<p>Studying such a system could help illuminate the <a href=\"https:\/\/www.sciencenews.org\/article\/nuclear-pasta-neutron-stars-may-be-strongest-material-universe\" rel=\"noreferrer noopener\" target=\"_blank\">mysterious material called nuclear pasta that makes up neutron stars<\/a> (<em>SN: 10\/27\/18, p. 8<\/em>). \u201cNeutron stars are kind of like giant atomic nuclei. Theyre nothing like what we can create on Earth,\u201d Berry says. The neutron star merger spotted in 2017 gave some details of <a href=\"https:\/\/www.sciencenews.org\/article\/collision-illuminates-mysterious-makeup-neutron-stars\" rel=\"noreferrer noopener\" target=\"_blank\">the stars makeup<\/a> (<em>SN: 12\/23\/17, p. 7<\/em>), including their maximum mass and squishiness. Spying a black hole-neutron star merger could show how a neutron star deforms near the extreme gravity of a black hole, another piece in the puzzle of how nuclear pasta behaves.<\/p>\n<h4><strong>4. A collision involving an intermediate-mass black hole <\/strong>[hhmc]<br \/>\n<\/h4>\n<p><strong>Status: Not yet<\/strong><\/p>\n<p>All the black holes that LIGO and Virgo have detected so far have been stellar mass, which means that they typically weigh less than 100 times the mass of the sun. Physicists also know of <a href=\"https:\/\/www.sciencenews.org\/article\/black-hole-first-picture-event-horizon-telescope\" rel=\"noreferrer noopener\" target=\"_blank\">supermassive black holes<\/a> that weigh millions or billions times the mass of the sun (<em>SN: 4\/27\/19, p. 6<\/em>). But its not clear if there are black holes with masses in between.<\/p>\n<p>Such <a href=\"https:\/\/www.sciencenews.org\/article\/middling-black-hole-may-be-hiding-star-cluster\" rel=\"noreferrer noopener\" target=\"_blank\">intermediate-mass black holes<\/a> \u201ccould be the link between stellar mass black holes and supermassive black holes in the centers of galaxies,\u201d Virgo team member Giovanni Andrea Prodi of the University of Trento in Italy said May 2 at a news conference.<\/p>\n<p>Previous research has seen hints of such middleweight black holes, but a collision detected with gravitational waves would be more definitive proof. If they dont exist, \u201cthats really interesting,\u201d Berry says, because it would mean supermassive black holes must have been <a href=\"https:\/\/www.sciencenews.org\/article\/astronomers-cant-figure-out-why-some-black-holes-got-so-big-so-fast\" rel=\"noreferrer noopener\" target=\"_blank\">born bigger than physicists can explain<\/a> (<em>SN Online: 3\/16\/18<\/em>).<\/p>\n<h4><strong>5. A bumpy neutron star<\/strong>[hhmc]<br \/>\n<\/h4>\n<p><strong>Status: Not yet<\/strong><\/p>\n<p>Another way to steal the secrets of neutron stars mysterious nuclear pasta is to detect miniature \u201cmountains\u201d on their surfaces. All massive objects that accelerate generate gravitational waves, but most of them are too faint to detect. Physicists think that a lone neutron star with a slight imperfection on it, like a bump about a millimeter high, would emit detectable gravitational waves as it spins. Such waves could help tell how stiff the neutron star material can be, in order to support the bumps.<\/p>\n<p>Unlike most other sources on this list, bumpy neutron stars would produce continuous gravitational waves, detected as a constant \u201chum\u201d by the observatories.<\/p>\n<h4><strong>6. Supernova explosions<\/strong>[hhmc]<br \/>\n<\/h4>\n<p><strong>Status: Not yet<\/strong><\/p>\n<p>LIGO and Virgo might also be able to pick up gravitational waves from supernova explosions, the bright cataclysms at the end of massive stars lives.<\/p>\n<p>Supernovas emit <a href=\"https:\/\/www.sciencenews.org\/article\/30-year-anniversary-supernova-1987a\" rel=\"noreferrer noopener\" target=\"_blank\">many types of light and particles<\/a>, including ghostly subatomic particles called neutrinos that are born deep in the heart of the explosions (<em>SN: 2\/18\/17, p. 20<a href=\"https:\/\/www.sciencenews.org\/article\/ligo-virgo-searching-sources-gravitational-waves\" rel=\"noreferrer noopener\" target=\"_blank\"><strong>Read More \u2013 Source<\/strong><\/a><\/em><br \/>\n[contf]<br \/>\n[contfnew]<br \/>\n        <img decoding=\"async\" src=\"https:\/\/www.sciencenews.org\/profiles\/sn\/themes\/science_news\/logo.png\" \/><\/p>\n<h5><a href=\"https:\/\/app.newswirenow.co.uk\/www.sciencenews.org\" rel=\"noreferrer noopener\" target=\"_blank\">science news<\/a><\/h5>\n<p>[contfnewc]<br \/>\n[contfnewc]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Seekers of gravitational waves are on a cosmic scavenger hunt.<\/p>\n<p>Since the Advanced Laser Interferome..<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[],"class_list":["post-119910","post","type-post","status-publish","format-standard","hentry","category-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LIGO is on the lookout for these 8 sources of gravitational waves - Business News Report<\/title>\n<meta name=\"description\" content=\"Seekers of gravitational waves are on a cosmic scavenger hunt. 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