Stars of spectral type 'Be' are often found with neutron stars or other evolved analogues, but a black-hole companion has never been spotted before. Optical emission from a black hole's surroundings has given it away. See Letter p.378
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McSwain, M. Black hole found orbiting a fast rotator. Nature 505, 296–297 (2014). https://doi.org/10.1038/505296a
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DOI: https://doi.org/10.1038/505296a
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