期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 497, 期 2, 页码 1895-1903出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa2088
关键词
convection; stars: AGB and post-AGB; binaries: general; white dwarfs
资金
- [NASA HST-AR-15044]
- [NTID SPDI15992]
- [NSF AST-2009713]
The formation channels and predicted populations of double white dwarfs (DWDs) are important because a subset will evolve to he gravitational-wave sources and/or progenitors of Type Ia supernovae. Given the observed population of short-period DWDs, we calculate the outcomes of common envelope (CE) evolution when convective effects are included. For each observed white dwarf (WD) in a DWD system, we identify all progenitor stars with an equivalent proto-WD core mass from a comprehensive suite of stellar evolution models. With the second observed WD as the companion, we calculate the conditions under which convection can accommodate the energy released as the orbit decays, including (if necessary) how much the envelope must spin-up during the CE phase. The predicted post-CE final separations closely track the observed DWD orbital parameter space, further strengthening the view that convection is a key ingredient in CE evolution.
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