第一个极地环双星行星的证据

IF 8.8 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Rebecca G. Martin, Stephen H. Lubow, David Vallet, Narsireddy Anugu, Douglas R. Gies
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引用次数: 0

摘要

摘要研究了后渐近巨支(AGB)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垂直于圆盘的双星轨道,其角动量矢量与双星偏心矢量的距离在9°以内,这意味着圆盘接近稳定的极对。对于尘埃的巨大内半径,最可能的解释是在环双星盘内有一颗行星。因此,这既是第一次报道的在agb后双星周围发现极地环双星盘,也是第一次发现极地环双星行星的证据。我们考虑了环双星盘大小和质量的动力学约束。极环双星盘在相对于双星轨道平面高度倾斜的轨道上为环星盘提供气体。由此产生的星周盘倾角可以在共面到极面之间的任何位置,这取决于质量吸积和二元扭矩之间的竞争。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
AC Her: Evidence of the First Polar Circumbinary Planet
Abstract 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° 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.
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来源期刊
Astrophysical Journal Letters
Astrophysical Journal Letters ASTRONOMY & ASTROPHYSICS-
CiteScore
14.10
自引率
6.30%
发文量
513
审稿时长
2-3 weeks
期刊介绍: The Astrophysical Journal Letters (ApJL) is widely regarded as the foremost journal for swiftly disseminating groundbreaking astronomical research. It focuses on concise reports that highlight pivotal advancements in the field of astrophysics. By prioritizing timeliness and the generation of immediate interest among researchers, ApJL showcases articles featuring novel discoveries and critical findings that have a profound effect on the scientific community. Moreover, ApJL ensures that published articles are comprehensive in their scope, presenting context that can be readily comprehensible to scientists who may not possess expertise in the specific disciplines covered.
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