First- versus second-generation planet formation in post-common envelope binary (PCEB) planetary systems

摘要: We examine planets orbiting post-common envelope binaries (PCEBs) from the perspective of angular momentum evolution, and conclude that are more likely to be first generation (FG) than second (SG) planets. FG were born together with parent stars, while SG form later a proto-planetary disk formed by mass-loss evolved primary star during its red giant branch (RGB) phase or asymptotic (AGB) phase. find in some systems scenario requires twenty percent mass ends Although we cannot rule out planet formation these systems, this fraction is much higher value commonly used theories. On other hand, for each can build progenitor system composed main-sequence binary orbited appropriate This done if secondary was resonance inner planet. To account properties suggest cases where has ~ 0.1-0.2Msun, it same way formed, i.e., disk.