Eric Burns

Dr. Eric Burns is a leading researcher in high-energy astrophysics, he studies neutron star mergers and gamma-ray bursts and helped lead the first multimessenger discovery of a binary neutron star merger. "Given the vast size of the universe, most scientists think life beyond Earth likely exists, and we are actively searching for it. However, there is no credible evidence that extraterrestrials have visited Earth or made contact with humanity. Previous government reviews of UFO reports have not produced convincing proof of alien technology. Astronomers are terrible at keeping secrets — if even one of us had solid evidence of aliens, the entire world would know by lunchtime. I strongly support transparency and look forward to the release of additional information, but extraordinary claims require extraordinary evidence."

Black Hole Eats Star: NASA Missions Discover Record-Setting Blast Dr. Eric Burns, associate professor of Physics & Astronomy in LSU’s College of Science, leads a consortium that studies gamma-ray bursts (GRBs), including the July event that, because of its long duration, stands in a class by itself. Because opportunities to study such events are so rare, and because they may reveal new ways to create GRBs, astronomers are particularly excited about the July burst. Burns discussed the discovery and the significance of this area of research. Can you explain your interest in gamma-ray bursts, why they matter, and how they play into these new discoveries? "I run a consortium that studies gamma-ray bursts. These are the most luminous explosions in the universe, other than the Big Bang itself. The consortium's been operating for almost 50 years. We've seen 15,000 gamma-ray bursts. We've used these sightings to understand the speed of gravity, where gold is created, and fundamental properties in the universe. In July, we detected a gamma-ray burst that was longer than we've ever seen before. They're normally like 30 seconds long. This one was 8 hours. It was so long that we didn't believe it was a gamma-ray burst for a while." What was your role in investigating this phenomenon? "The consortium I run helped find it and helped figure out where it was coming from. We put a bunch of telescopes on it to try and figure out what was happening and to understand what caused this event. Normal gamma-ray bursts come from a massive star near the end of its life. The interior of the star collapses, and it forms a black hole. That black hole eats it from the inside out, and it launches this matter that's moving at basically the speed of light, and that produces your gamma-ray burst. By chance, a colleague and I had written a paper earlier this year on what is the longest gamma-ray burst you could produce with this scenario. And the answer is 1,000 seconds. So we're pretty sure that what happened here was this: You have that massive star, but instead of its core becoming the black hole, instead you have a black hole that falls into it. Or they sort of fall into each other." How was this long gamma-ray burst discovered? And what led to your involvement in studying it? "We have what’s called gamma-ray burst monitors. They're a version of a telescope, but they're not like a long tube that you use to see visible light with your eyes. They're actually crystals that detect when they are hit by a gamma ray by fluorescing and sending out light. And so we could detect them that way. In the consortium I run, there are about a dozen of these gamma ray detectors. They're all on different satellites. Most of them are around Earth, but some of them are much further out in our solar system. We've automated most of our processes. The spacecraft itself will detect this event and report it to the community. All of that happens in like 30 seconds. In this case, our satellite had four different triggers spread over eight hours, and a member of the community pointed out that these events were coming from the same general area in the sky. So, even before the last trigger, within a couple hours, we realized, oh, there's something really long happening here that we haven't really seen before." Full story available here.

BATON ROUGE – 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? A new answer has come from an unexpected place – magnetars. 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. On rare occasions, magnetars release an enormous amount of high-energy radiation when they undergo “starquakes,” which, like earthquakes, fracture the neutron star’s crust. Starquakes may also be associated with powerful bursts of radiation called magnetar giant flares, which can even affect Earth’s atmosphere. Only three magnetar giant flares have been observed in the Milky Way and the nearby Large Magellanic Cloud, and seven from other nearby galaxies. Astrophysicist Eric Burns and his team of researchers at Louisiana State University in Baton Rouge study magnetars extensively through the observation of gamma-rays. These are the most energetic photons, most famous for turning Bruce Banner into the Incredible Hulk. Burns joined with researchers at Columbia University and other institutions to see if we could use gamma-rays to understand if magnetar giant flares forge the heaviest elements, and unexpectedly found the smoking-gun signature in decades-old data. The study, led by Anirudh Patel, a doctoral student at Columbia University in New York, is published in The Astrophysical Journal Letters. “It’s answering one of the questions of the century and solving a mystery using archival data that people had just forgotten about, demonstrating something that occurred when the Universe was younger,” said Burns. “Giant flares should occur just after the first stars died, meaning we have identified what could be the origin of the first gold in the universe.” How could gold be made at a magnetar? 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 “rapid process” of neutrons forging lighter atomic nuclei into heavier ones. Protons define the element’s identity on the periodic table: hydrogen has 1 proton, helium has 2, lithium has 3, and so on. Atoms also have neutrons which do not affect identity, but do add mass. Sometimes when an atom captures an extra neutron the atom becomes unstable and a 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. In the unique environment of a disrupted neutron 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. When astronomers observed the collision of two neutron stars in 2017 using NASA telescopes and the gravitational wave observatory LIGO, they confirmed that this event could have created gold, platinum, and other heavy elements. “LIGO tells us there was a merger of compact objects, and Fermi tells us there was a short gamma-ray burst. Together, we know that what we observed was the merging of two neutron stars, dramatically confirming the relationship,” said Burns. But neutron star mergers happen too late in the universe’s history to explain the earliest gold and other heavy elements. Finding secrets in old data At first, Metzger and colleagues thought that the easiest signature to study 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 work out what that signal could look like. Burns looked up the gamma ray data from the last giant flare that was 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 from the magnetar, in data from ESA (European Space Agency)’s INTEGRAL, a retired mission with NASA contributions. “It was noted at the time, but nobody had any conception of what it could be,” Burns said. Metzger remembers that Burns thought he and Patel were “pulling his leg” because the prediction from their team’s 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 thought it should look like when heavy elements are created and then distributed in a magnetar giant flare. "This is my favorite discovery I've contributed to,” said Burns. “My colleagues found this signal in the past, but nobody knew what it could be at the time. Once these models were ready, everything fit like a perfect puzzle, which is extremely rare in science." Researchers supported their conclusion using data from two NASA heliophysics missions: the retired RHESSI (Reuven Ramaty High Energy Solar Spectroscopic Imager) and the ongoing NASA Wind satellite, which had also observed the magnetar giant flare. Other collaborators on the new study included Jared Goldberg at the Flatiron Institute. Next steps in the magnetar gold rush Patel’s study estimates that magnetar giant flares could contribute about 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 created this way. LSU PhD candidate Aaron Trigg, a NASA FINESST (Future Investigators in NASA Earth and Space Science and Technology) fellow, who works with Burns, is responsible for finding more magnetar giant flares to study. “These are gargantuan outbursts of energy from the strongest magnets in the Universe, which are powerful enough to affect Earth’s atmosphere,” said Burns. Trigg’s work will help us better understand these sources.” NASA’s forthcoming COSI (Compton Spectrometer and Imager) mission can follow up on these results. COSI, a wide-field gamma ray telescope, 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. LSU is one of the lead science institutes for COSI. Burns and LSU Assistant Professor Michela Negro have key responsibilities in the mission, and Trigg is working through how best to study giant flares with COSI. These LSU astrophysicists will be growing their research group as they approach launch in 2027. “I have so many questions about the cosmos and our place in it,” said Trigg. “This research allows me to explore those questions and share the answers with the world.”