The LIGO/Virgo collaboration recently announced the detection of an unusual compact binary merger including either the most massive neutron star or the least massive black hole known. The formation path of such a binary system is still up for debate.
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Safarzadeh, M. A compact object in the mass gap. Nat Astron 4, 735–736 (2020). https://doi.org/10.1038/s41550-020-1177-1
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DOI: https://doi.org/10.1038/s41550-020-1177-1