"X-ray emission from helium star+black hole binaries as probes of tidally induced spin-up of second-born black holes"
Koushik Sen (Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Torun, Poland, Steward Observatory, Department of Astronomy, University of Arizona, Tucson, AZ, USA), Aleksandra Olejak (Max Planck Institute for Astrophysics, Garching, Germany), Sambaran Banerjee (Helmholtz-Instituts f\"ur Strahlen- und Kernphysik, Bonn, Germany, Argelander-Institut f\"ur Astronomie, Bonn, Germany)