The outer hydrogen layers of the stars have been ripped away by a companion star, leaving them as an exposed helium star.
in binary systems that have had their outer layers of hydrogen stripped away by a companion star. This leaves behind a star with exposed dense and hot outer layers of helium that have been forged deep with the star via the fusion of hydrogen.
Astronomers have known of low-mass stripped stars and high-mass stripped stars of this type for some time, but these types are either too small or too large to result in systems that can develop into a kilonova. Intermediate-mass stripped helium stars with masses between two and eight times that of the sun , which are just right for such an event, have been elusive, however.
"The stripped stars identified here are therefore valuable for constraining the physical properties of this important but elusive population," the authors wrote in the study."With estimated masses of around two to eight solar masses, they fill the helium-star mass gap, connecting subdwarfs with Wolf-Rayet stars and represent the first sample of the most likely progenitors for stripped-envelope core-collapse.
When the stripped star has run out of the fuel for nuclear fusion, it undergoes a type of cosmic explosion called an ultra-stripped supernova, which ejects little material but leaves behind a. At this point, the tables are turned, and that newly born neutron star begins to feed on its companion star, resulting in the companion also undergoing an ultra-stripped supernova explosion.
The result is a neutron star binary system comprised of two tightly bound dense stellar corpses that emit
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