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arXiv 1104.2898astro-ph.EPastro-ph.SR
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碎片盘与类地行星的联系

The debris disk - terrestrial planet connection

Sean N. Raymond, Philip J. Armitage, Amaya Moro-Martín, Mark Booth, Mark Wyatt, John C. Armstrong, Avi M. Mandell, Franck Selsis

摘要:

已知的太阳系外巨行星的偏心轨道提供了证据,表明大多数行星形成环境都经历了剧烈的动力学不稳定性。在这里,我们数值模拟了巨行星不稳定性对整个行星系的影响。我们发现,内部岩石和外部冰体的人口都是由巨行星动力学塑造的,并且自然相关。强烈的不稳定性--那些非常古怪的幸存的巨行星--完全清除了它们的内部和外部区域。相比之下,具有稳定或低质量巨行星的系统在其内部区域形成类地行星,并且外部冰冷的天体产生尘埃,这些尘埃在中红外波长下可以作为碎片盘观察到。15%到20%的老恒星被观察到有明亮的碎片盘(波长约为70微米),我们预测这些路标动态平静的环境应该包含类地行星。

英文摘要:

The eccentric orbits of the known extrasolar giant planets provide evidence that most planet-forming environments undergo violent dynamical instabilities. Here, we numerically simulate the impact of giant planet instabilities on planetary systems as a whole. We find that populations of inner rocky and outer icy bodies are both shaped by the giant planet dynamics and are naturally correlated. Strong instabilities -- those with very eccentric surviving giant planets -- completely clear out their inner and outer regions. In contrast, systems with stable or low-mass giant planets form terrestrial planets in their inner regions and outer icy bodies produce dust that is observable as debris disks at mid-infrared wavelengths. Fifteen to twenty percent of old stars are observed to have bright debris disks (at wavelengths of ~70 microns) and we predict that these signpost dynamically calm environments that should contain terrestrial planets.

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