arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1012.0584astro-ph.EP
收藏

行星-行星散射如何产生高倾角和长周期轨道

How planet-planet scattering can create high-inclination as well as long-period orbits

Sourav Chatterjee, Eric B. Ford, Frederic A. Rasio

摘要:

最近的观测揭示了两类新的行星轨道。罗西特-麦克劳克林(RM)的测量揭示了在高密度轨道上的热彗星。此外,直接成像还通过直接成像技术发现了巨大的行星(约100 AU)。头脑简单的磁盘迁移方案是不一致的高倾角(甚至逆行)的轨道,在最近的RM测量。此外,在大的半长轴(a)上形成巨行星可能在核心吸积范式中具有挑战性。我们进行了许多N体模拟来探索上述两种轨道结构。多行星系统中的行星间散射可以自然地激发轨道倾角。行星也可以分散到很远的地方。由行星-行星散射产生的大a行星轨道预计具有高偏心率(e)。理论模型预测,观测到的长周期行星,如北落师门b,具有中等的e \approx 0.3。有趣的是,这些也存在于有磁盘的系统中。我们发现,如果存在一个足够大的外盘,一个分散的行星可能会通过从磁盘的动力学摩擦和磁盘粒子的反复散射而在大的圆。

英文摘要:

Recent observations have revealed two new classes of planetary orbits. Rossiter- Mclaughlin (RM) measurements have revealed hot Jupiters in high-obliquity orbits. In addition, direct-imaging has discovered giant planets at large (~ 100 AU) separations via direct-imaging technique. Simple-minded disk-migration scenarios are inconsistent with the high-inclination (and even retrograde) orbits as seen in recent RM measurements. Furthermore, forming giant planets at large semi-major axis (a) may be challenging in the core-accretion paradigm. We perform many N-body simulations to explore the two above-mentioned orbital architectures. Planet-planet scattering in a multi-planet system can naturally excite orbital inclinations. Planets can also get scattered to large distances. Large-a planetary orbits created from planet-planet scattering are expected to have high eccentricities (e). Theoretical models predict that the observed long-period planets, such as Fomalhaut-b have moderate e \approx 0.3. Interestingly, these are also in systems with disks. We find that if a massive-enough outer disk is present, a scattered planet may be circularized at large a via dynamical friction from the disk and repeated scattering of the disk particles.

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。

↑