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• W3136672331 endingPage "L21" @default.
• W3136672331 startingPage "L21" @default.
• W3136672331 abstract "We solve the equations of two-dimensional hydrodynamics describing a circumbinary disk accreting onto an eccentric, equal-mass binary. We compute the time rate of change of the binary semimajor axis $a$ and eccentricity $e$ over a continuous range of eccentricities spanning $e=0$ to $e=0.9$. We find that binaries with initial eccentricities $e_0 lesssim 0.1$ tend to $e=0$, where the binary semimajor axis expands. All others are attracted to $e approx 0.4$, where the binary semimajor axis decays. The $e approx 0.4$ attractor is caused by a rapid change in the disk response from a nearly origin-symmetric state to a precessing asymmetric state. The state change causes the time rates of change $dot{a}$ and $dot{e}$ to steeply change sign at the same critical eccentricity resulting in an attracting solution where $dot{a} = dot{e} = 0$. This does not, however, result in a stalled, eccentric binary. The finite-transition time between disk states causes the binary eccentricity to evolve beyond the attracting eccentricity in both directions resulting in oscillating orbital parameters and a drift of the semimajor axis. For the chosen disk parameters, binaries with $e_0 gtrsim 0.1$ evolve toward and then oscillate around $e approx 0.4$ where they shrink in semimajor axis. Because unequal mass binaries grow toward equal mass through preferential accretion, our results are applicable to a wide range of initial binary mass ratios. Hence, these findings merit further investigations of this disk transition; understanding its dependence on disk parameters is vital for determining the fate of binaries undergoing orbital evolution with a circumbinary disk." @default.
• W3136672331 created "2021-03-29" @default.
• W3136672331 creator A5055500597 @default.
• W3136672331 creator A5088568381 @default.
• W3136672331 date "2021-06-01" @default.
• W3136672331 modified "2023-10-09" @default.
• W3136672331 title "Orbital Evolution of Equal-mass Eccentric Binaries due to a Gas Disk: Eccentric Inspirals and Circular Outspirals" @default.
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• W3136672331 doi "https://doi.org/10.3847/2041-8213/ac0621" @default.
• W3136672331 hasPublicationYear "2021" @default.
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