标题： 年轻低质量恒星和褐矮星的角动量演化：观测与理论 显示英文标题

标题： Angular momentum evolution of young low-mass stars and brown dwarfs: observations and theory

摘要： 本章旨在对年轻低质量恒星和褐矮星自转动量演化方面的新兴概念以及最新观测结果进行全面回顾。自《原恒星与行星V》以来，在多个年龄阶段以及不同恒星形成环境中旋转周期测量数据的可用性方面取得了重大进展，这对于验证理论至关重要。同时，在过去几年中也进行了大量的理论研究发展，包括恒星-盘相互作用的物理机制、恒星风的数值模拟以及恒星内部角动量传输过程的研究。本章回顾了最近在观测和理论方面的进展，这些进展促使了针对冷型恒星和褐矮星的新的自转动量演化模型的发展。尽管这些新模型似乎已经能够解释低质量天体自转历史的主要观测趋势，但仍存在一些关键的未解决问题，将在本综述中概述。 显示英文摘要

摘要： This chapter aims at providing the most complete review of both the emerging concepts and the latest observational results regarding the angular momentum evolution of young low-mass stars and brown dwarfs. In the time since Protostars & Planets V, there have been major developments in the availability of rotation period measurements at multiple ages and in different star-forming environments that are essential for testing theory. In parallel, substantial theoretical developments have been carried out in the last few years, including the physics of the star-disk interaction, numerical simulations of stellar winds, and the investigation of angular momentum transport processes in stellar interiors. This chapter reviews both the recent observational and theoretical advances that prompted the development of renewed angular momentum evolution models for cool stars and brown dwarfs. While the main observational trends of the rotational history of low mass objects seem to be accounted for by these new models, a number of critical open issues remain that are outlined in this review.