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For one, it's really close to the upper end of how massive a neutron star can be. https://en.wikipedia.org/wiki/Tolman%E2%80%93Oppenheimer%E2%... says the limit is around 2.01 to 2.17 solar masses.


The next problem is https://arxiv.org/pdf/1006.2834.pdf which has the lightest black holes at 5.0⊙

There's another interesting object - https://www.science.org/doi/10.1126/science.adg3005

This is a binary system with a total mass of 3.887⊙ ± 0.004 ... which puts the companion in the system at 2.09⊙ to 2.71⊙ ... which may be in the "heavier than any theoretical neutron star, but lighter than any known black hole.

A recent Dr. Becky video on this: FOUND in the MASS GAP: The heaviest neutron star OR the lightest black hole? https://youtu.be/8PHt7NcwllA




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