高度倾斜环双星盘中对偏心双星系统的脉冲吸积
Pulsed Accretion onto Eccentric Binaries in Highly Misaligned Circumbinary Disks
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中文总结 AI 辅助
本研究通过三维SPH模拟发现，高度倾斜环双星盘中偏心双星的吸积在近星点附近产生双脉冲，且脉冲相位随倾角变化，为脉冲时标与盘取向关系提供依据。
中文摘要 AI 辅助
我们展示了围绕中等偏心等质量双星（$e_\mathrm{b}=0.5$）的高度倾斜环双星盘（CBDs）的三维平滑粒子流体动力学模拟。我们表明，双星吸积在双星轨道周期上受到调制，并在近星点附近表现出两个脉冲。对于初始双星-盘倾角为$60^\circ$的情况，主导脉冲在近星点之前达到峰值；在$90^\circ$时，脉冲峰值移至近星点之后；而在$120^\circ$时，脉冲出现在更晚的近星点后相位。我们进一步表明，这两个脉冲伴随着星周盘（CSDs）的时间依赖性响应，以及吸积物质在腔体内和星周盘周围的不同分布。尽管脉冲振幅存在变化，但在单个双星轨道中，近星点前与近星点后的定性区别仍然存在。我们的结果激励了未来对脉冲时标是否与双星-盘取向相关的测试。
英文摘要
We present three-dimensional smoothed particle hydrodynamics simulations of highly misaligned circumbinary disks (CBDs) around moderately eccentric equal-mass binaries ($e_\mathrm{b}=0.5$). 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 $60^\circ$, shifts to after periastron at $90^\circ$, and occurs at an even later post-periastron phase at $120^\circ$. 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 post-periastron 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.
发表机构
- School of Physics and Astronomy, Sun Yat-sen University（中山大学物理学院）
- Department of Physics & Astronomy, Baylor University（贝勒大学物理与天文系）
- Center for Astrophysics, Space Physics, and Engineering Research, Baylor University（贝勒大学天体物理学、空间物理学与工程研究中心）
- CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area, Sun Yat-sen University（中山大学粤港澳大湾区子午线二期科学中心）
- Dipartimento di Fisica “G. Occhialini”, Università degli Studi di Milano-Bicocca（米兰比可卡大学“G.奥基亚利尼”物理系）
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