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But we don't know what the other object was. That's because it sits firmly in a niche known as the lower mass gap – the seemingly rare bodies with masses somewhere between the chonkiest neutron stars and the titchiest
"While previous evidence for mass-gap objects has been reported both in gravitational and electromagnetic waves, this system is especially exciting because it's the first gravitational-wave detection of a mass-gap object paired with a neutron star," What determines the outcome is mass. Stars with a starting mass of about eight to 30 times the mass of the Sun end up as neutron stars. Once most of the stellar material has been ejected, the collapsed core will have a mass of up toStellar black holes form in the collapse of stars with far more mass, leaving highly-concentrated pockets of material that tend to range from around five to a.
The new detection, called GW230529, was made in May 2023. By analyzing the gravitational wave signal, the LIGO, Virgo, and KAGRA collaborations were able to determine that one of the objects involved was between 1.2 and 2 solar masses. That's fairly solidly in the neutron star range.
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