期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 474, 期 3, 页码 3998-4009出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx2711
关键词
hydrodynamics; methods: numerical; planets and satellites: dynamical evolution and stability; planets and satellites: formation; planet-disc interactions; planetary systems
资金
- Science & Technology Facilities Council (STFC)
- Swiss National Science Foundation [200020_162930]
- Leverhulme Trust
- European Research Council (ERC) under the European Union's Horizon research and innovation programme [681601]
- BIS National E-infrastructure capital grant [ST/K001590/1]
- STFC [ST/H008861/1, ST/H00887X/1]
- DiRAC [ST/K00333X/1]
- STFC [ST/L000636/1, ST/M006948/1, ST/R002363/1, ST/K00333X/1, ST/H00887X/1, ST/P000673/1, ST/P002307/1, ST/H008861/1] Funding Source: UKRI
- Swiss National Science Foundation (SNF) [200020_162930] Funding Source: Swiss National Science Foundation (SNF)
We present 2D hydrodynamical simulations of pairs of planets migrating simultaneously in the Type I regime in a protoplanetary disc. Convergent migration naturally leads to the trapping of these planets in mean-motion resonances. Once in resonance the planets' eccentricity grows rapidly, and disc-planet torques cause the planets to escape resonance on a time-scale of a few hundred orbits. The effect is more pronounced in highly viscous discs, but operates efficiently even in inviscid discs. We attribute this resonance-breaking to overstable librations driven by moderate eccentricity damping, but find that this mechanism operates differently in hydrodynamic simulations than in previous analytic calculations. Planets escaping resonance in this manner can potentially explain the observed paucity of resonances in Kepler multitransiting systems, and we suggest that simultaneous disc-driven migration remains the most plausible means of assembling tightly packed planetary systems.
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