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• W3048842312 endingPage "5582" @default.
• W3048842312 startingPage "5569" @default.
• W3048842312 abstract "ABSTRACT Tidal dissipation due to turbulent viscosity in the convective regions of giant stars plays an important role in shaping the orbits of pre-common-envelope systems. Such systems are possible sources of transients and close compact binary systems that will eventually merge and produce detectable gravitational wave signals. Most previous studies of the onset of common envelope episodes have focused on circular orbits and synchronously rotating donor stars under the assumption that tidal dissipation can quickly spin-up the primary and circularize the orbit before the binary reaches Roche lobe overflow (RLO). We test this assumption by coupling numerical models of the post-main-sequence stellar evolution of massive stars with the model for tidal dissipation in convective envelopes developed in Vick & Lai – a tidal model that is accurate even for highly eccentric orbits with small pericentre distances. We find that, in many cases, tidal dissipation does not circularize the orbit before RLO. For a $10, {rm M}_{odot }$ ($15, {rm M}_{odot }$) primary star interacting with a $1.4, {rm M}_{odot }$ companion, systems with pericentre distances within 3 au (6 au) when the primary leaves the main sequence will retain the initial orbital eccentricity when the primary grows to the Roche radius. Even in systems that tidally circularize before RLO, the donor star may be rotating subsynchronously at the onset of mass transfer. Our results demonstrate that some possible precursors to double neutron star systems are likely eccentric at the Roche radius. The effects of pre-common-envelope eccentricity on the resulting compact binary merit further study." @default.
• W3048842312 created "2020-08-18" @default.
• W3048842312 creator A5007773051 @default.
• W3048842312 creator A5008910526 @default.
• W3048842312 creator A5040946565 @default.
• W3048842312 creator A5081703282 @default.
• W3048842312 date "2021-03-25" @default.
• W3048842312 modified "2023-10-17" @default.
• W3048842312 title "Tidal dissipation impact on the eccentric onset of common envelope phases in massive binary star systems" @default.
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