HOW NOT TO BUILD TATOOINE: THE DIFFICULTY OF IN SITU FORMATION OF CIRCUMBINARY PLANETS KEPLER 16b, KEPLER 34b, AND KEPLER 35b
HOW NOT TO BUILD TATOOINE: THE DIFFICULTY OF IN SITU FORMATION OF CIRCUMBINARY PLANETS KEPLER 16b, KEPLER 34b, AND KEPLER 35b
复制标题
DOI：
10.1088/2041-8205/754/1/l16
复制
发表时间：
2012-06
期刊：
影响因子：
--
通讯作者：
S. Paardekooper;Z. Leinhardt;P. Thebault;C. Baruteau
中科院分区：
文献类型：
--
作者：
S. Paardekooper;Z. Leinhardt;P. Thebault;C. Baruteau
我们研究环双星盘中的星子演化，重点关注最近发现行星的开普勒16、34和35三个系统。我们表明，对于环双星子，除了长期强迫外，偏心率在动态时间尺度上演化，即使在存在气体阻力的情况下也会导致轨道交叉。这使得环绕双星的开普勒行星的当前位置不利于星子吸积。然后，我们给出了包括星子形成和尘埃吸积在内的模拟结果，并表明即使在100%有效尘埃吸积的最有利情况下，开普勒16b、开普勒34b和开普勒35b也很难从小于10公里的星子开始原位生长。这些行星很可能聚集在更远的圆盘上，然后向内迁移到它们现在的位置。
We study planetesimal evolution in circumbinary disks, focusing on the three systems Kepler 16, 34, and 35 where planets have been discovered recently. We show that for circumbinary planetesimals, in addition to secular forcing, eccentricities evolve on a dynamical timescale, which leads to orbital crossings even in the presence of gas drag. This makes the current locations of the circumbinary Kepler planets hostile to planetesimal accretion. We then present results from simulations including planetesimal formation and dust accretion, and show that even in the most favorable case of 100% efficient dust accretion, in situ growth starting from planetesimals smaller than ∼10 km is difficult for Kepler 16b, Kepler 34b, and Kepler 35b. These planets were likely assembled further out in the disk, and migrated inward to their current location.