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SCATTER: A New Common Envelope Formalism

Rosanne Di StefanoMatthias U. KruckowYan GaoPatrick G. NeunteufelChiaki Kobayashi
Dec 2022
摘要
One of the most mysterious astrophysical states is the common envelope (CE)phase of binary evolution, in which two stars are enshrouded by the envelopeshed by one of them. Interactions between the stars and the envelope shrinksthe orbit. The CE can lead to mergers or to a subsequent phase of interactions.Mergers may involve any combination of two compact objects and/or stars. Someinvolving white dwarfs, may produce Type Ia supernovae, while merging neutronstars may yield gamma-ray bursts, and merging compact objects of all kindsproduce gravitational radiation. Since CEs can arise from a variety ofdifferent initial conditions, and due to the complexity of the processesinvolved, it is difficult to predict their end states. When many systems arebeing considered, as in population synthesis calculations, conservationprinciples are generally employed. Here we use angular momentum in a new way toderive a simple expression for the final orbital separation. This methodprovides advantages for the study of binaries and is particularly well-suitedto higher order multiples, now considered to be important in the genesis ofpotential mergers. Here we focus on CEs in binaries, and the follow-up paperextends our formalism to multiple star systems within which a CE occurs.
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