Long-term evolution of binary orbits induced by circumbinary disks

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Volume 688 (August 2024)

A&A, 688 (2024) A128

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Table 1.

Summary of the main parameters and results of the considered suites of hydrodynamic simulations.

	Siwek et al. (2023a,b)	Zrake et al. (2021)	D’Orazio & Duffell (2021)
	S23a, S23b	Z21	DD21
Code	`Arepo`	`Mara3`	`DISCO`
Mesh type	Voronoi moving mesh	Cartesian grid	Cylindrical moving mesh
Viscosity	α = 0.1	α = 0.1	ν = 10⁻³a²Ω
Disk aspect ratio	0.1	0.1	0.1
Gravity softening radius [a]	0.025	0.02	0.05
Sink radius [a]	0.03	0.02	0.1
Parameter space (e-q)	0.1 ≤ q ≤ 1	q = 1	q = 1
	0 ≤ e ≤ 0.8	0 ≤ e ≤ 0.8	0 ≤ e ≤ 0.9
Exploration strategy	Discrete sampling	Discrete sampling	Adiabatic sweeping
Parameter combinations explored	9 × 10	32	≈40 ^(a)
Number of orbits per combination	10 000	2000	≈444 ^(a)
Relaxation radius [a]	≈21 ^(b)	≈7	≈2 ^(a)

Circular orbit stability	Unstable	Stable	Stable
e_eq	$0 . 48_{- 0.08}^{+ 0.02}$ $0.48^{+0.02}_{-0.08}$	$0 . 443_{- 0.018}^{+ 0.007}$ $0.443^{+0.007}_{-0.018}$	$0 . 39_{- 0.01}^{+ 0.01}$ $0.39^{+0.01}_{-0.01}$
a′(e = e_eq)	–0.70	–2.3	0 or –0.49 ^(c)

Notes.

^(a)

Estimated, given a single sweep 20 000 orbits long and a resolution in eccentricity Δe = 0.02.

^(b)

S23a report 27 instead of 21, due to a typo in Eq. (7). The correct factor in front of the viscous timescale is 2/3 instead of 4/9.

^(c)

If considering oscillations around the equilibrium configuration.

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