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arXiv 2310.19600astro-ph.EPastro-ph.SR
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AC Her:首个极轨环双星行星的证据

AC Her: Evidence of the first polar circumbinary planet

Rebecca G. Martin, Stephen H. Lubow, David Vallet, Narsireddy Anugu, Douglas R. Gies

AI总结:

本文通过分析 post-AGB 双星 AC Her 的轨道与盘面几何关系,发现其环双星盘接近稳定极向排列,并首次提出盘内存在极轨环双星行星的证据,同时讨论了盘的大小、质量及气体供给对 circumstellar disk 倾角的影响。

摘要:

我们研究了后渐近巨星支(AGB)恒星双星 AC Her 及其环双星盘的几何结构。我们表明,观测结果描述了一个与盘面垂直的双星轨道,其角动量矢量与双星偏心率矢量的夹角在 $9^\circ$ 以内,这意味着该盘接近稳定的极向排列。尘埃内半径非常大的最可能解释是环双星盘中存在一颗行星。因此,这既是首次报道在 post-AGB 双星周围探测到极轨环双星盘,也是极轨环双星行星的首个证据。我们考虑了环双星盘大小和质量的动力学约束。该极轨环双星盘以与双星轨道平面高度倾斜的轨道向 circumstellar disks 提供气体。由此产生的 circumstellar disk 倾角可能介于共面到极向之间,具体取决于质量吸积与双星力矩之间的竞争。

英文摘要:

We examine the geometry of the post-asymptotic giant branch (AGB) star binary AC Her and its circumbinary disk. We show that the observations describe a binary orbit that is perpendicular to the disk with an angular momentum vector that is within $9^\circ$ of the binary eccentricity vector, meaning that the disk is close to a stable polar alignment. The most likely explanation for the very large inner radius of the dust is a planet within the circumbinary disk. This is therefore both the first reported detection of a polar circumbinary disk around a post-AGB binary and the first evidence of a polar circumbinary planet. We consider the dynamical constraints on the circumbinary disk size and mass. The polar circumbinary disk feeds circumstellar disks with gas on orbits that are highly inclined with respect to the binary orbit plane. The resulting circumstellar disk inclination could be anywhere from coplanar to polar depending upon the competition between the mass accretion and binary torques.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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