论文标题
行星散射的影响：解释观察到的时期比率3：2和2：1的偏移
Effects of Planetesimal Scattering: Explaining the Observed Offsets from Period Ratios 3:2 and 2:1
论文作者
论文摘要
观察到的赤字和过量的相邻行星对，周期比窄，宽3：2和2：1，相应的平均运动共振（MMR）的标称值（MMR）吸引了许多。以前，使用一套模拟，Chatterjee＆Ford（2015）表明，如果最初被困在2：1 MMR中的行星对，则可以自然解释超过2：1 mmr的多余，并且可以在磁盘中与附近的行星动态相互作用。我们通过以下方式建立在这项工作的基础上：a）更新发现的行星对的人口普查，b）将研究扩展到最初的非谐振和共鸣的行星对，c）使用直接观察到的初始行星和轨道特性，以及d）将初始时间比包括2：1和3：3：2。我们发现1）与行星的相互作用通常会增加最初共振和非谐振行星对的周期比； 2）从3：2和2：1的系统的最初固定周期比分布开始，这些相互作用可以自然会产生这些周期比的狭窄的缺陷； 3）最初需要贡献的贡献，以解释观察到的过量宽3：2的水平； 4）混合模型最初将大约25％（1％）的行星对捕获到3：2（2：1）MMR中受到青睐，以解释在这些时期比率上观察到的赤字和系统过量，但是，今天，预计多达百分之几的行星对仍保留在MMR中。
The observed deficit and excess of adjacent planet pairs with period ratios narrow and wide of 3:2 and 2:1, the nominal values for the corresponding mean motion resonances (MMRs), have intrigued many. Previously, using a suite of simulations, Chatterjee & Ford (2015) showed that the excess above the 2:1 MMR can be naturally explained if planet pairs, initially trapped in the 2:1 MMR, dynamically interact with nearby planetesimals in a disk. We build on this work by: a) updating the census of discovered planet pairs, b) extending the study to initially non-resonant as well as resonant planet pairs, c) using initial planet and orbital properties directly guided by those observed, and d) extending the initial period ratios to include both 2:1 and 3:2. We find that 1) interactions with planetesimals typically increase the period ratios of both initially resonant and non-resonant planet pairs; 2) starting from an initially flat period ratio distribution for systems across 3:2 and 2:1, these interactions can naturally create the deficits observed narrow of these period ratios; 3) contribution from initially resonant planet pairs is needed to explain the observed levels of excess wide of 3:2; 4) a mixture model where about 25% (1%) planet pairs were initially trapped into 3:2 (2:1) MMRs is favored to explain both the observed deficit and excess of systems across these period ratios, however, up to a few percent of planet pairs are expected to remain in MMR today.
