论文标题
部分可观测时空混沌系统的无模型预测
First Steps of Planet Formation Around Very Low Mass Stars and Brown Dwarfs
论文作者
论文摘要
棕色矮人和非常低的质量恒星是我们银河系中的很大一部分恒星，它们是在低温和密度的极端条件下研究行星形成的有趣实验室。此外，在这些磁盘中行星形成的第一步中，颗粒的尘埃径向漂移预计将是更难克服的障碍。 ALMA高角度分辨率观测到BD和VLM周围几个原动性磁盘的观察结果如在阳光状恒星周围的磁盘上显示的子结构。这样的观察结果表明，嵌入磁盘中的巨型行星是观察到的子结构的最可能起源。但是，这种类型的行星代表到迄今为止全恒星的确认系外行星的2％，并且它们很难通过不同的核心积聚模型（卵石或行星促进）形成。对Alma和JWST周围BD和VLM周围的磁盘的专门观察将在理解这些物体的主要特性（例如磁盘大小和质量）方面提供重大进展，这对于确定这些磁盘的演变以及对这些环境中可能形成的潜在星球的影响至关重要。
Brown dwarfs and very low mass stars are a significant fraction of stars in our galaxy, and they are interesting laboratories to investigate planet formation in extreme conditions of low temperature and densities. In addition, the dust radial drift of particles is expected to be a more difficult barrier to overcome during the first steps of planet formation in these disks. ALMA high-angular resolution observations of few protoplanetary disks around BDs and VLMS have shown substructures as in the disks around Sun-like stars. Such observations suggest that giant planets embedded in the disks are the most likely origin of the observed substructures. However, this type of planets represent less than 2% of the confirmed exoplanets so far around all stars, and they are difficult to form by different core accretion models (either pebble or planetesimal accretion). Dedicated deep observations of disks around BDs and VLMS with ALMA and JWST will provide significant progress on understanding the main properties of these objects (e.g., disk size and mass), which is crucial for determining the physical mechanisms that rule the evolution of these disks and the effect on the potential planets that may form in these environments.
