6149 20230123125418.0 10.1038/s41550-022-01730-y DOI SCART-2023-0075 Shenar, Tomer An X-ray-quiet black hole born with a negligible kick in a massive binary within the Large Magellanic Cloud 2022 Stellar-mass black holes are the final remnants of stars born with more than 15 solar masses. Billions are expected to reside in the Local Group, yet only a few are known, mostly detected through X-rays emitted as they accrete material from a companion star. Here, we report on VFTS 243: a massive X-ray-faint binary in the Large Magellanic Cloud. With an orbital period of 10.4 d, it comprises an O-type star of 25 solar masses and an unseen companion of at least nine solar masses. Our spectral analysis excludes a non-degenerate companion at a 5σ confidence level. The minimum companion mass implies that it is a black hole. No other X-ray-quiet black hole is unambiguously known outside our Galaxy. The (near-)circular orbit and kinematics of VFTS 243 imply that the collapse of the progenitor into a black hole was associated with little or no ejected material or black-hole kick. Identifying such unique binaries substantially impacts the predicted rates of gravitational-wave detections and properties of core-collapse supernovae across the cosmos. NO Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Astrophysics of Galaxies Astrophysics - Solar and Stellar Astrophysics Sana, Hugues Mahy, Laurent El-Badry, Kareem Marchant, Pablo Langer, Norbert Hawcroft, Calum Fabry, Matthias Sen, Koushik Almeida, Leonardo A. Abdul-Masih, Michael Bodensteiner, Julia Crowther, Paul A. Gieles, Mark Gromadzki, Mariusz Hénault-Brunet, Vincent Herrero, Artemio de Koter, Alex Iwanek, Patryk Kozłowski, Szymon Lennon, Daniel J. Maíz Apellániz, Jesús Mróz, Przemysław Moffat, Anthony F. J. Picco, Annachiara Pietrukowicz, Paweł Poleski, Radosław Rybicki, Krzysztof Schneider, Fabian R. N. Skowron, Dorota M. Skowron, Jan Soszyński, Igor Szymański, Michał K. Toonen, Silvia Udalski, Andrzej Ulaczyk, Krzysztof Vink, Jorick S. Wrona, Marcin Nature Astronomy 6 2022 1085-1092 laurent.mahy@ksb-orb.be 6768162 http://publi2-as.oma.be/record/6149/files/Shenar_2022_2207.07675.pdf 3090 http://publi2-as.oma.be/record/6149/files/Shenar_2022_2207.07675.gif?subformat=icon icon 3933 http://publi2-as.oma.be/record/6149/files/Shenar_2022_2207.07675.jpg?subformat=icon-180 icon-180 published in REFERD