The black star project

The Black Star Project is located at S.

The black star project

October 31, by Nolan O'brien, Lawrence Livermore National Laboratory Supercomputer simulations show the evolution of a dormant white dwarf star reigniting as it whizzes around an intermediate-mass black hole. The top series of images show density, the bottom show temperature.

Lawrence Livermore National Laboratory Black holes are among the most elusive objects in the universe, but research out of Lawrence Livermore National Laboratory LLNL suggests the remnant cores of burned-out stars could be the key to making the first observation of the most elusive class of black holes.

The research explored whether a dormant white dwarf star—sometimes referred to as a "zombie" star—could reignite if it had a close encounter with an intermediate-mass black hole. While data exists to corroborate the existence of supermassive black holes, there have been no confirmed observations of black holes in the intermediate class, which range in size from tosolar masses.

This intermediate class, the research team posited, might offer just the right amount of gravitational force to reignite a white dwarf before it's torn apart.

The black star project

The team ran supercomputer simulations of dozens of different close encounter scenarios to test this theory.

Not only did they find that a close encounter would reignite the once-dead star, but they saw evidence that the process could create significant electromagnetic and gravitational wave energies that might be visible from detectors in near-Earth orbit.

The research was published in the September issue of the Astrophysical Journal. If the stars align, so to speak, a zombie star could serve as a homing beacon for a never-before-detected class of black holes.

The closer the pass, the more efficient the nucleosynthesis, and the greater the iron production. All told, the research suggests that an "optimal" close encounter could fuse up to 60 percent of the stellar matter into iron.

This peak mass conversion took place with a white dwarf passing at a distance of two or three black hole radii. As it approaches the black hole, tidal forces begin to compress the star in a direction perpendicular to the orbital plane, reigniting it.

But within the orbital plane, these gravitational forces stretch the star and tear it apart. It's a competing effect. They also are the highest resolution simulations to date of nucleosynthesis inside the core of a tidally disrupted white dwarf star, where the strongest reactions occur.The Black Star Project is an action-based organization founded in to provide educational services that improve the lives of less-advantaged Black students, parents, and communities and to close the racial academic achievement gap.

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