论文标题
制作野兽：围绕巨大恒星周围行星系统的动态形成
Making BEASTies: dynamical formation of planetary systems around massive stars
论文作者
论文摘要
系外行星表现出令人难以置信的多样性，从与我们的太阳系截然不同的阳光恒星周围的行星系统体系结构到绕行后梅纳后序列恒星或恒星残余的行星。最近，B-Star系外行星丰度研究（BEAST）报道了在SCO CEN OB协会中发现至少有两个超霍维亚行星，这些行星绕着大巨星。尽管这样的巨大恒星确实有开普勒碟片，但很难设想能够在这种敌对环境中形成的气体巨型行星。我们使用恒星形成区域的N体模拟表明，这些系统可以从捕获自由浮动行星的捕获或将行星从一个恒星到另一个恒星更大的恒星中直接盗窃而形成。我们发现，在关联进化的前10myr中，平均一次发生一次，并且迄今确认的野兽行星（290和556au）的半轴轴与捕获更一致。我们的结果进一步证明了这一观点，即更遥远（> 100AU）轨道上的行星可能不会绕其父恒星绕。
Exoplanets display incredible diversity, from planetary system architectures around Sun-like stars that are very different to our Solar System, to planets orbiting post-main sequence stars or stellar remnants. Recently the B-star Exoplanet Abundance STudy (BEAST) reported the discovery of at least two super-Jovian planets orbiting massive stars in the Sco Cen OB association. Whilst such massive stars do have Keplerian discs, it is hard to envisage gas giant planets being able to form in such hostile environments. We use N-body simulations of star-forming regions to show that these systems can instead form from the capture of a free-floating planet, or the direct theft of a planet from one star to another, more massive star. We find that this occurs on average once in the first 10Myr of an association's evolution, and that the semimajor axes of the hitherto confirmed BEAST planets (290 and 556au) are more consistent with capture than theft. Our results lend further credence to the notion that planets on more distant (>100au) orbits may not be orbiting their parent star.
