Pulsed Accretion onto Eccentric Binaries in Highly Misaligned Circumbinary Disks

Abstract

We present three-dimensional smoothed particle hydrodynamics simulations of highly misaligned circumbinary disks (CBDs) around moderately eccentric equal-mass binaries ( e b = 0.5). We show that the binary accretion is modulated on the binary orbital period and exhibits two pulses near periastron. The dominant pulse peaks before periastron for an initial binary-disk misalignment of 60 ∘ , shifts to after periastron at 90 ∘ , and occurs at an even later postperiastron phase at 120 ∘ . We further show that the two pulses are accompanied by a time-dependent response of the circumstellar disks (CSDs) and by different distributions of accreting material within the cavity and around the CSDs. The qualitative pre- versus postperiastron distinction is also present in individual binary orbits despite variations in pulse amplitude. Our results motivate future tests of whether pulse timing is related to binary-disk orientation.

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BibTeX RIS

BibTeX

@article{杨2026pulsed,
  title = {{Pulsed Accretion onto Eccentric Binaries in Highly Misaligned Circumbinary Disks}},
  author = {Ruiqi 锐祺 Yang 杨 and Jeremy L. Smallwood and Shang-Fei 尚飞 Liu 刘 and Alessia Franchini},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = nov,
  doi = {10.3847/1538-4357/aeacdc},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aeacdc},
  note = {CC BY 4.0},
}

RIS

TY  - JOUR
TI  - Pulsed Accretion onto Eccentric Binaries in Highly Misaligned Circumbinary Disks
AU  - Ruiqi 锐祺 Yang 杨
AU  - Jeremy L. Smallwood
AU  - Shang-Fei 尚飞 Liu 刘
AU  - Alessia Franchini
PY  - 2026
DA  - 2026/11/03
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aeacdc
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aeacdc
AB  - We present three-dimensional smoothed particle hydrodynamics simulations of highly misaligned circumbinary disks (CBDs) around moderately eccentric equal-mass binaries ( e b = 0.5). We show that the binary accretion is modulated on the binary orbital period and exhibits two pulses near periastron. The dominant pulse peaks before periastron for an initial binary-disk misalignment of 60 ∘ , shifts to after periastron at 90 ∘ , and occurs at an even later postperiastron phase at 120 ∘ . We further show that the two pulses are accompanied by a time-dependent response of the circumstellar disks (CSDs) and by different distributions of accreting material within the cavity and around the CSDs. The qualitative pre- versus postperiastron distinction is also present in individual binary orbits despite variations in pulse amplitude. Our results motivate future tests of whether pulse timing is related to binary-disk orientation.
SN  - 1538-4357
SN  - 0004-637X
ER  -

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