Mysterious object in the gap

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Inspiral of a lower mass-gap black hole (dark gray surface) and a neutron star (
Inspiral of a lower mass-gap black hole (dark gray surface) and a neutron star (orange sphere). The emitted gravitational waves are shown in colors from dark blue to cyan. © I. Markin (Potsdam University), T. Dietrich (Potsdam University and Max Planck Institute for Gravitational Physics), H. Pfeiffer, A. Buonanno (Max Planck Institute for Gravitational Physics)

On May 29, 2023, the LIGO Livingston detector observed a mysterious signal, called GW230529. It originated from the merger of a neutron star with an unknown compact object, most likely an unusually light-weight black hole. With a mass of only a few times that of our Sun, the object falls into the "lower mass gap" between the heaviest neutron stars and the lightest black holes. Researchers at the Max Planck Institute for Gravitational Physics contributed to the discovery with accurate waveform models, new data-analysis methods, and sophisticated detector technology. ...

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