![\"A](\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/cds\/creative\/flare_magnetar.jpg?w=1900&h=1069&fit=clip&crop=faces%2Cfocalpoint\")
<\/a><\/figure>Since the big bang, the early universe had hydrogen, helium, and a scant amount of lithium. Later, some heavier elements, including iron, were forged in stars. But one of the biggest mysteries in astrophysics is: How did the first elements heavier than iron, such as gold, get created and distributed throughout the universe?<\/p>\n
\u201cIt\u2019s a pretty fundamental question in terms of the origin of complex matter in the universe,\u201d said Anirudh Patel, a doctoral student at Columbia University in New York. \u201cIt\u2019s a fun puzzle that hasn\u2019t actually been solved.\u201d<\/p>\n
Patel led a study using 20-year-old archival data from NASA and ESA telescopes that finds evidence for a surprising source of a large amount of these heavy elements: flares from highly magnetized neutron stars, called magnetars. The study is published in The Astrophysical Journal Letters<\/a>.<\/p>\n Study authors estimate that magnetar giant flares could contribute up to 10% of the total abundance of elements heavier than iron in the galaxy. Since magnetars existed relatively early in the history of the universe, the first gold could have been made this way.<\/p>\n \u201cIt\u2019s answering one of the questions of the century and solving a mystery using archival data that had been nearly forgotten,\u201d said Eric Burns, study co-author and astrophysicist at Louisiana State University in Baton Rouge.<\/p>\n Neutron stars are the collapsed cores of stars that have exploded. They are so dense that one teaspoon of neutron star material, on Earth, would weigh as much as a billion tons. A magnetar is a neutron star with an extremely powerful magnetic field.<\/p>\n On rare occasions, magnetars release an enormous amount of high-energy radiation when they undergo \u201cstarquakes,\u201d which, like earthquakes, fracture the neutron star\u2019s crust. Starquakes may also be associated with powerful bursts of radiation called magnetar giant flares, which can even affect Earth\u2019s atmosphere. Only three magnetar giant flares have been observed in the Milky Way and the nearby Large Magellanic Cloud, and seven outside.<\/p>\n Patel and colleagues, including his advisor Brian Metzger, professor at Columbia University and senior research scientist at the Flatiron Institute in New York, have been thinking about how radiation from giant flares could correspond to heavy elements forming there. This would happen through a \u201crapid process\u201d of neutrons forging lighter atomic nuclei into heavier ones. \u00a0\u00a0<\/p>\n Protons define the element\u2019s identity on the periodic table: hydrogen has one proton, helium has two, lithium has three, and so on. Atoms also have neutrons which do not affect identity, but do add mass. Sometimes when an atom captures an extra neutron\u00a0the atom becomes unstable and\u00a0a nuclear decay process happens that converts a neutron into a proton, moving the atom forward on the periodic table. This is how, for example, a gold atom could take on an extra neutron and then transform into mercury.\u00a0<\/p>\n In the unique environment of a\u00a0disrupted\u00a0neutron star, in which the density of neutrons is extremely high, something even stranger happens: single atoms can rapidly capture so many neutrons that they undergo multiple decays, leading to the creation of a much heavier element like uranium.<\/p>\n When astronomers observed the collision of two neutron stars in 2017<\/a> using NASA telescopes and the Laser Interferometer Gravitational wave Observatory (LIGO<\/a>), and numerous telescopes on the ground and in space that followed up the initial discovery, they confirmed that this event could have created gold, platinum, and other heavy elements. But neutron star mergers happen too late in the universe\u2019s history to explain the earliest gold and other heavy elements. Recent research<\/a> by co-authors of the new study \u2014 Jakub Cehula of Charles University in Prague, Todd Thompson of The Ohio State University, and Metzger \u2014 has found that magnetar flares can heat and eject neutron star crustal material at high speeds, making them a potential source.<\/p>\n At first, Metzger and colleagues thought that the signature from the creation and distribution of heavy elements at a magnetar would appear in the visible and ultraviolet light, and published their predictions. But Burns in Louisiana wondered if there could be a gamma-ray signal bright enough to be detected, too. He asked Metzger and Patel to check, and they found that there could be such a signature.<\/p>\n \u201cAt some point, we said, \u2018OK, we should ask the observers if they had seen any,\u2019\u201d Metzger said.<\/p>\n Burns looked up the gamma ray data from the last giant flare that has been observed, which was in December 2004. He realized that while scientists had explained the beginning of the outburst, they had also identified a smaller signal<\/a> from the magnetar, in data from ESA (European Space Agency)\u2019s INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL<\/a>), a recently retired mission with NASA contributions. \u201cIt was noted at the time, but nobody had any conception of what it could be,\u201d Burns said.<\/p>\n Metzger remembers that Burns thought he and Patel were \u201cpulling his leg\u201d because the prediction from their team\u2019s model so closely matched the mystery signal in the 2004 data. In other words, the gamma ray signal detected over 20 years ago corresponded to what it should look like when heavy elements are created and then distributed in a magnetar giant flare.<\/p>\n Patel was so excited, \u201cI wasn\u2019t thinking about anything else for the next week or two. It was the only thing on my mind,\u201d he said.<\/p>\n Researchers supported their conclusion using data from two NASA heliophysics missions: the retired RHESSI\u00a0(Reuven Ramaty High Energy Solar Spectroscopic Imager<\/a>) and the ongoing NASA\u2019s\u00a0Wind<\/a> satellite, which had also observed the magnetar giant flare. Other collaborators on the new study included Jared Goldberg at the Flatiron Institute.<\/p>\n NASA\u2019s forthcoming COSI (Compton Spectrometer and Imager) mission<\/a> can follow up on these results. A wide-field gamma ray telescope, COSI is expected to launch in 2027 and will study energetic phenomena in the cosmos, such as magnetar giant flares. COSI will be able to identify individual elements created in these events, providing a new advancement in understanding the origin of the elements. It is one of many telescopes that can work together to look for \u201ctransient\u201d changes across the universe<\/a>.<\/p>\n Researchers will also follow up on other archival data to see if other secrets are hiding in observations of other magnetar giant flares.<\/p>\n \u201cIt very cool to think about how some of the stuff in my phone or my laptop was forged in this extreme explosion of the course of our galaxy\u2019s history,\u201d Patel said.<\/p>\n Elizabeth Landau Powered by WPeMatico<\/a><\/small><\/p>\n Get The Details…<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" Since the big bang, the early universe had hydrogen, helium, and a scant amount of lithium. Later, some heavier elements, including iron, were forged in stars. But one of the biggest mysteries in astrophysics is: How did the first elements heavier than iron, such as gold, get created and distributed throughout the universe? \u201cIt\u2019s a [\u2026] Continue reading How could gold be made at a magnetar?<\/strong><\/h3>\n
<\/a><\/figure>New clues in old data<\/strong><\/h3>\n
Next steps in the magnetar gold rush<\/strong><\/h3>\n
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