The formation and evolution of discs around young stars

年轻恒星周围圆盘的形成和演化

• 批准号: 2407766
• 金额: --
• 依托单位: UNIVERSITY OF EXETER
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2407766
• 关键词: formation; evolution; discs; around; young

Advances in observational facilities, particularly the advent of the Atacama Large Millimetre Array (ALMA) and the VLT/SPHERE instrument, have recently provided images of discs around young stars at unprecedented resolutions and sensitivities. These observations are providing large samples of discs with measured masses and sizes, and that display a wide variety of structures (e.g. dust rings, spirals, and dust arcs).The aim of this PhD project is to use hydrodynamical models of disc formation and evolution to extend our understanding of the origin of the diversity of protoplanetary discs and the physical processes that drive their evolution. The project will begin by examining the properties of discs produced in a series of radiation hydrodynamical simulations of star cluster formation, to determine how disc properties may depend on initial conditions and environment, such as in regions of lower or higher stellar density, or at different metallicities, or at high redshift. Following this initial project, attention will shift to detailed studies of discs around single and multiple protostellar systems, including better understanding the dynamics and growth of dust in protoplanetary discs (i.e. the earliest stages of planet formation), and the dynamics of discs in binary and multiple star systems (e.g. time-variable accretion from a circumbinary disc onto the embedded stars, and the evolution of discs that are misaligned with the orbit of a binary or multiple system). The project will involve performing and analysing state-of-the-art radiation hydrodynamical simulations of star formation and protoplanetary discs, and comparison of hydrodynamical models with analytical theory and observations.

观测设施的进步，特别是阿塔卡马大型毫米阵列（ALMA）和VLT/SPHERE仪器的出现，最近以前所未有的分辨率和灵敏度提供了围绕年轻恒星的圆盘的图像。这些观测提供了大量的圆盘样本，测量了它们的质量和大小，并显示了各种各样的结构（例如尘埃环、螺旋和尘埃弧）。这个博士项目的目的是利用盘的形成和演化的流体动力学模型来扩展我们对原行星盘多样性起源和驱动其演化的物理过程的理解。该项目将首先检查在一系列星团形成的辐射流体动力学模拟中产生的盘的特性，以确定盘的特性如何取决于初始条件和环境，例如在恒星密度较低或较高的区域，或在不同的金属丰度，或在高红移的区域。在这个初始项目之后，注意力将转移到单个和多个原恒星系统周围的盘的详细研究，包括更好地理解原行星盘中尘埃的动力学和生长（即行星形成的最早阶段），以及双星和多星系统中盘的动力学（例如，从环双星盘到嵌入恒星的时变吸积）。以及与双星或多星系统的轨道不一致的盘的演化)。该项目将包括执行和分析恒星形成和原行星盘的最先进的辐射流体动力学模拟，并将流体动力学模型与分析理论和观测结果进行比较。