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Accreting Binary Eccentricities Follow Predicted Equilibrium Values

delete2025-03-24
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A
A. R. M. Murray *
P
Paul C. Duffell
DOI：10.3847/1538-4357/adb96edelete
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Abstract

Abstract

En 中文
We investigate observations of circumbinary disks (CBDs) to find evidence for an equilibrium eccentricity predicted by current binary accretion theory. Although stellar binary demographics in the Milky Way show no evidence for a preferred eccentricity for binary systems, we show that actively accreting systems lie on a predicted equilibrium eccentricity curve. We constrain our sample to only systems that have well-defined orbital parameters (e.g., eccentricity, mass ratio, inclination angle). We find observations are consistent with theory for stellar binaries that are aligned with the disk and that are separated enough that tidal circularization is negligible. This suggests that eccentricity in these systems evolves after the dissipation of the CBD, given the flat eccentricity distribution of binary systems in the Milky Way.
Keywords:
BLACK-HOLE BINARIES
CIRCUMBINARY DISKS
ORBITAL EVOLUTION
POLAR ALIGNMENT
PROTOPLANETARY DISC
COMMON-ENVELOPE
GALAXY MERGERS
STAR-FORMATION
GAS
DYNAMICS

Journal

Astrophysical Journal cover
Astrophysical Journal
IF:
5.4
Papers:
8.3W
Citations:
32.0W

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No organization information available