行星形成能解决高红移星系的尘埃预算危机吗？
Can planet formation resolve the dust budget crisis in high redshift galaxies?
摘要：
行星形成的过程通过原恒星盘中的颗粒生长和碎片盘系统中较大物体的研磨提供了丰富的尘埃生产来源。化学演化模型，旨在跟踪金属和尘埃在星系中的积累，目前还不能解释行星形成。我们认为，在高红移星系中的尘埃质量的化学演化模型的明显预测不足的可能性，可能在一定程度上，由于这些模型忽略了这一过程，特别是由于他们的假设，即大部分的尘埃质量是从星际介质在恒星形成（所谓的astration）。通过添加一个行星形成阶段到星系的化学演化，我们表明，尘埃预算危机可以部分改善的因素只有1.3-1.5，如果a）拱星盘防止大部分的尘埃质量进入恒星在其诞生期间，和b），尘埃质量优先解放通过喷流，风和外流，而不是吸积成行星质量的机构。
英文摘要：
The process of planet formation offers a rich source of dust production via grain growth in protostellar discs, and via grinding of larger bodies in debris disc systems. Chemical evolution models, designed to follow the build up of metals and dust in galaxies, do not currently account for planet formation. We consider the possibility that the apparent under-prediction of dust mass in high redshift galaxies by chemical evolution models could be in part, due to these models neglecting this process, specifically due to their assumption that a large fraction of the dust mass is removed from the interstellar medium during star formation (so-called astration). By adding a planet formation phase into galaxy chemical evolution, we demonstrate that the dust budget crisis can be partially ameliorated by a factor of 1.3-1.5 only if a) circumstellar discs prevent a large fraction of the dust mass entering the star during its birth, and b) that dust mass is preferentially liberated via jets, winds and outflows rather than accreted into planetary-mass bodies.
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