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Massive widowed stars: Runaways and walkaways from binary disruptions

Detail Summary
Date 28 September 2017
Time 12:00 - 13:00
Mathieu Renzo

Most massive stars are in binary systems, but at the time of the first supernova, more than ~80% of these systems are disrupted. The supernova explosion separate the newly formed compact object from its companion, now a "widowed" star. This prevents the majority of massive binaries from potentially becoming gravitational wave sources. In some cases, the companion widowed star becomes fast enough to be recognized as a runaway, but much more often its velocity is too low, and it will only be a "walkaway" star. I will present the typical evolutionary path of these widowed runaways and walkaways, and how they might be used to constrain binary evolution processes and supernova natal kicks for neutron stars and black holes. The disruption of binaries spreads the massive stars and the locations where they die, with potential implications for various feedback processes such as energy injection, ionizing radiation, and chemical pollution. I will show that even relatively slow walkaway stars can reach ~100pc distances from their birth location thanks to the effects of binary mass transfer.