{"id":14961,"date":"2026-01-29T18:03:13","date_gmt":"2026-01-29T22:03:13","guid":{"rendered":"https:\/\/zobi.alcowep.com\/bourtagshdrevxnls658739\/nasa-researchers-probe-tangled-magnetospheres-of-merging-neutron-stars\/"},"modified":"2026-01-29T18:03:13","modified_gmt":"2026-01-29T22:03:13","slug":"nasa-researchers-probe-tangled-magnetospheres-of-merging-neutron-stars","status":"publish","type":"post","link":"https:\/\/zobi.alcowep.com\/bourtagshdrevxnls658739\/nasa-researchers-probe-tangled-magnetospheres-of-merging-neutron-stars\/","title":{"rendered":"NASA Researchers Probe Tangled Magnetospheres of Merging Neutron Stars"},"content":{"rendered":"

NASA Researchers Probe Tangled Magnetospheres of Merging Neutron Stars<\/h2>\n

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7 min read<\/p>\n

NASA Researchers Probe Tangled Magnetospheres of Merging Neutron Stars<\/h1>\n<\/div>\n<\/div>\n<\/div>\n

New simulations performed on a NASA supercomputer are providing scientists with the most comprehensive look yet into the maelstrom of interacting magnetic structures around city-sized neutron stars in the moments before they crash. The team identified potential signals emitted during the stars\u2019 final moments that may be detectable by future observatories. \u00a0<\/p>\n

\u201cJust before neutron stars crash, the highly magnetized, plasma-filled regions around them, called magnetospheres, start to interact strongly. We studied the last several orbits before the merger, when the entwined magnetic fields undergo rapid and dramatic changes, and modeled potentially observable high-energy signals,\u201d said lead scientist Dimitrios Skiathas, a graduate student at the University of Patras<\/a>, Greece, who is conducting research for the Southeastern Universities Research Association<\/a> in Washington at NASA\u2019s Goddard Space Flight Center<\/a> in Greenbelt, Maryland.<\/p>\n

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New supercomputer simulations explore the tangled magnetic structures around merging neutron stars. Called magnetospheres, the highly magnetized, plasma-filled regions start to interact as the city-sized stars close on each other toward their final orbits. Magnetic field lines can connect both stars, break, and reconnect, while currents surge through surrounding plasma moving at nearly the speed of light. The simulations show that as these systems merge to produce one kind of gamma-ray burst \u2014 the universe\u2019s most powerful class of explosions \u2014 they emit tell-tale X-rays and gamma rays that future observatories should be able to detect. NASA\u2019s Goddard Space Flight Center<\/strong><\/figcaption><\/figure>\n
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A paper<\/a> describing the findings published Nov. 20, 2025, in the The Astrophysical Journal.<\/p>\n

Neutron star mergers produce a particular type of GRB (gamma-ray burst), the most powerful class of explosions in the cosmos.<\/p>\n

Most investigations have naturally concentrated on the spectacular mergers and their aftermaths, which produce near-light-speed jets that emit gamma rays, ripples in space-time called gravitational waves, and a so-called kilonova explosion that forges heavy elements like gold and platinum. A merger observed in 2017<\/a> dramatically confirmed the long-predicted connections between these phenomena \u2014 and remains the only event seen so far to exhibit all three.<\/p>\n

Neutron stars pack more mass than our Sun into a ball about 15 miles (24 kilometers) across, roughly the length of Manhattan Island in New York City. They form when the core of a massive star runs out of fuel and collapses, crushing the core and triggering a supernova explosion that blasts away the rest of the star. The collapse also revs up the core\u2019s rotation and amplifies its magnetic field.<\/p>\n

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In our simulations, the magnetosphere behaves like a magnetic circuit that continually rewires itself as the stars orbit.<\/span><\/h2>\n<\/p><\/div>\n
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Constantinos Kalapotharakos<\/p>\n

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Newborn neutron stars can spin dozens of times a second and wield some of the strongest magnetic fields known, up to 10 trillion times stronger than a refrigerator magnet. That\u2019s strong enough to directly transform gamma-rays into electrons and positrons and rapidly accelerate them to energies far beyond anything achievable in particle accelerators on Earth.\u00a0<\/p>\n

\u201cIn our simulations, the magnetosphere behaves like a magnetic circuit that continually rewires itself as the stars orbit. Field lines connect, break, and reconnect while currents surge through plasma moving at nearly the speed of light, and the rapidly varying fields can accelerate particles,\u201d said co-author Constantinos Kalapotharakos at NASA Goddard. \u201cFollowing that nonlinear evolution at high resolution is exactly why we need a supercomputer!\u201d<\/p>\n

Using the Pleiades supercomputer at NASA\u2019s Ames Research Center in California\u2019s Silicon Valley, the team ran more than 100 simulations of a system of two orbiting neutron stars, each with 1.4 solar masses. The goal was to explore how different magnetic field configurations affected the way electromagnetic energy \u2014 light in all of its forms \u2014 left the binary system. Most of the simulations describe the last 7.7 milliseconds before the merger, enabling a detailed study of the final orbits.<\/p>\n

\u201cOur work shows that the light emitted by these systems varies greatly in brightness and is not distributed evenly, so a far-away observer\u2019s perspective on the merger matters a great deal,\u201d said co-author Zorawar Wadiasingh at the University of Maryland, College Park<\/a> and NASA Goddard. \u201cThe signals also get much stronger as the stars get closer and closer in a way that depends on the relative magnetic orientations of the neutron stars.\u201d<\/p>\n

Magnetic field lines anchored to the surfaces of each star sweep behind them as the stars orbit. Field lines may directly connect one star to the other as the orbits shrink, while lines already linking the stars may break and reconfigure.<\/p>\n

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One value of studies like this is to help us figure out what future observatories might be able to see and should be looking for in both gravitational waves and light.<\/span><\/h2>\n<\/p><\/div>\n
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Demosthenes Kazanas<\/p>\n

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Using the simulations, the team also computed electromagnetic forces acting on the stars\u2019 surfaces. While the effects of gravity dominate, these magnetic stresses could accumulate in strongly magnetized systems. Future models may help reveal how magnetic interactions influence the last moments of the merger.<\/p>\n

\u201cSuch behavior could be imprinted on gravitational wave signals that would be detectable in next-generation facilities. One value of studies like this is to help us figure out what future observatories might be able to see and should be looking for in both gravitational waves and light,\u201d said Goddard\u2019s Demosthenes Kazanas.<\/p>\n

The team, which includes Alice Harding at the Los Alamos National Laboratory<\/a> in New Mexico and Paul Kolbeck at the University of Washington<\/a> in Seattle, then used the simulated fields to identify where the highest-energy emission would be produced and how it would propagate.<\/p>\n

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\"Simulation<\/a><\/figure>
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This view of a supercomputer simulation of merging, magnetized neutron stars highlights regions producing the highest-energy light. Brighter colors indicate stronger emission. These regions produce gamma rays with energies trillions of times greater than that of visible light, but likely none of it could escape. That\u2019s because the highest-energy gamma rays quickly convert to particles in the presence of the stars\u2019 powerful magnetic fields. However, gamma rays at lower energies, with millions of times the energy of visible light, can exit the merging system, and the resulting particles may also radiate at still lower energies, including X-rays. The emission varies rapidly and is highly directional, but it could potentially be detected by future facilities.<\/div>\n
NASA\u2019s Goddard Space Flight Center\/D. Skiathas et al. 2025<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n

In the chaotic plasma surrounding the neutron stars, particles transform into radiation and vice versa. Speedy electrons emit gamma rays, the highest-energy form of light, through a process called curvature radiation. A gamma-ray photon can interact with a strong magnetic field in a way that transforms it into a pair of particles, an electron and a positron.<\/p>\n

The study found regions producing gamma rays with energies trillions of times greater than that of visible light, but likely none of it could escape. The highest-energy gamma rays quickly converted to particles in the presence of powerful magnetic fields. However, gamma rays at lower energies, with millions of times the energy of visible light, can exit the merging system, and the resulting particles may also radiate at still lower energies, including X-rays.<\/p>\n

The finding suggests that future medium-energy gamma-ray space telescopes, especially those with wide fields of view, may detect signals originating in the runup to the merger if gravitational-wave observatories can provide timely alerts and sky localization. Today, ground-based gravitational-wave observatories, such as LIGO<\/a> (Laser Interferometer Gravitational-Wave Observatory) in Louisiana and Washington, and Virgo<\/a> in Italy, detect neutron star mergers with frequencies between 10 and 1,000 hertz and can enable rapid electromagnetic follow-up.<\/p>\n

ESA<\/a> (European Space Agency) and NASA are collaborating on a space-based gravitational-wave observatory named LISA<\/a> (Laser Interferometer Space Antenna), planned for launch in the 2030s. LISA will observe neutron-star binaries much earlier in their evolution at far lower gravitational-wave frequencies than ground-based observatories, typically long before they merge.<\/p>\n

Future gravitational-wave observatories will be able to alert astronomers to systems on the verge of merging. Once such systems are found, wide-field gamma-ray and X-ray observatories could begin searching for the pre-merger emission highlighted by these simulations.<\/p>\n

Routine observation of events like these using two different \u201cmessengers\u201d \u2014 light and gravitational waves \u2014 will provide a major leap forward in understanding this class of GRBs, and NASA researchers are helping to lead the way.<\/p>\n

By Francis Reddy<\/a>
NASA\u2019s Goddard Space Flight Center<\/a>, Greenbelt, Md.<\/p>\n

Media Contact:
Claire Andreoli
301-286-1940
claire.andreoli@nasa.gov<\/a>
NASA\u2019s Goddard Space Flight Center, Greenbelt, Md.<\/strong><\/p>\n

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