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arXiv 2009.14723astro-ph.EP
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轨道稳定性和潮汐迁移约束对Exomoon候选者的应用

Application of Orbital Stability and Tidal Migration Constraints for Exomoon Candidates

Billy Quarles, Gongjie Li, Marialis Rosario-Franco

摘要:

太阳系外行星的卫星或系外卫星处于利用现有技术可探测性的前沿,在搜寻时应考虑到理论上的限制。在这封信中,我们将轨道稳定性和潮汐迁移的理论约束应用于Fox & Wigert(2020)提出的六个候选KOI系统,以确定这些系统是否有可能容纳外卫星。外卫星的轨道稳定度仅限于主行星希尔半径($\sim$ 20 R $_{\rm p}$)的40%。利用来自太阳系的合理潮汐参数,我们发现六个系统中有四个要么会潮汐地破坏它们的系外卫星,要么会在系统寿命内因向外迁移而失去它们。剩下的两个系统(KOI 268.01和KOI 1888.01)可能拥有25 R $_{\rm p}$以内的外卫星,并且小于宿主行星质量的$\sim$ 3%。然而,Kipping(2020)最近的一项独立的过境时间分析发现,这些系统未能通过严格的统计测试来验证它们作为候选者。总体而言,我们发现这些系统中存在足够大的TTV签名的exoons是不太可能的观测建模,潮汐迁移和轨道稳定性的综合约束。可以在GitHub存储库Multiversario/satcand中找到重现我们结果的软件。

英文摘要:

Satellites of extrasolar planets, or exomoons, are on the frontier of detectability using current technologies and theoretical constraints should be considered in their search. In this Letter, we apply theoretical constraints of orbital stability and tidal migration to the six candidate KOI systems proposed by Fox & Wigert (2020) to identify whether these systems can potentially host exomoons. The host planets orbit close to their respective stars and the orbital stability extent of exomoons is limited to only $\sim$40% of the host planet's Hill radius ($\sim$20 R$_{\rm p}$). Using plausible tidal parameters from the solar system, we find that four out of six systems would either tidally disrupt their exomoons or lose them to outward migration within the system lifetimes. The remaining two systems (KOI 268.01 and KOI 1888.01) could host exomoons that are within 25 R$_{\rm p}$ and less than $\sim$3% of the host planet's mass. However, a recent independent transit timing analysis by Kipping (2020) found that these systems fail rigorous statistical tests to validate them as candidates. Overall, we find the presence of exomoons in these systems that are large enough for TTV signatures to be unlikely given the combined constraints of observational modeling, tidal migration, and orbital stability. Software to reproduce our results is available in the GitHub repository: Multiversario/satcand.

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。

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