Quiet Black Holes With a Stellar Companion Raise Questions About How They Form

• The article discusses the discovery of three quiet black holes with stellar companions, which are not directly observable but can be detected through their gravitational effects. These black holes are in close binary systems where the companion star is not consuming its material, making them difficult to detect. The study highlights the complexity of how such systems form, particularly the role of Roche Lobe Overflow, a process where material from an expanding star is captured by the companion star.

• The findings suggest that the formation of these systems is more complex than previously thought, as the close orbits of the companions in BH1 and BH2 pose challenges in understanding how they survived the expansion and collapse of their large companion stars. The study provides insights into the dynamics of binary systems and the mechanisms by which stellar remnants evolve into black holes.

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