New constraints on disk-dissipation processes from the relation between accretion and X-ray activity

吸积和 X 射线活动之间的关系对盘耗散过程的新约束

• 批准号: 386429177
• 负责人: Professor Dr. Thomas Preibisch
• 金额: --
• 依托单位: Europäische Südliche Sternwarte (ESO)
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/386429177?language=en
• 关键词: New; constraints; disk; dissipation; processes

As discussed in the general introduction, Type I transition disks (TDs), which present small inner cavities and a depleted accretion signature, are thought to be objects caught in the act of dispersal. Photoevaporation from X-ray radiation from the central star is thought to be the main driver in the dispersal of disks around solar and later-type stars. We want to test models of X-ray driven disk photoevaporation leading to the formation of transition disks by using new observational data to study the relation between accretion rates of young stars and their X-ray emission. The aim is to combine the numerous available high-quality X-ray data of young stars in different regions with new and highly reliable accretion rates that can be derived from the new spectroscopic data on these stars. In this way, we will be able to study the relation between X-ray emission and accretion with much larger samples (hundreds of stars rather than just a few dozen) and for different regions spanning a range of ages, and to test the predictions of theoretical models of X-ray driven disk photoevaporation and the corresponding effects on the disk accretion rate. This is of fundamental importance to understand the formation and residual accretion rate distribution of transition disks.

正如在一般性介绍中所讨论的，I型过渡盘（TD），具有小的内腔和耗尽的吸积特征，被认为是在分散行为中捕获的物体。来自中心星星的X射线辐射的光蒸发被认为是太阳系和晚型恒星周围圆盘分散的主要驱动力。我们希望通过使用新的观测数据来研究年轻恒星吸积率与其X射线发射之间的关系，来测试导致过渡盘形成的X射线驱动盘光蒸发模型。目的是将不同区域年轻恒星的大量现有高质量X射线数据与从这些恒星的新光谱数据中得出的新的、高度可靠的吸积率结合起来，联合收割机。通过这种方式，我们将能够研究X射线发射和吸积之间的关系与更大的样本（数百颗恒星，而不仅仅是几十颗），并为不同的区域跨越一个年龄范围，并测试X射线驱动盘光蒸发的理论模型的预测和相应的影响盘吸积率。这对于理解过渡盘的形成和剩余吸积率分布具有重要意义。