来源：科技日报 科技日报记者 赵汉斌 记者29日从中国科学院云南天文台获悉，该台系外行星与太阳系小行星研究团组近期借助光谱巡天大数据与机器 学习技术，新发现了一大批磁活动年轻恒星，为研究恒星磁场起源、演化及行星形成机制提供了重要样本。相关 研究成果发表在国际期刊《天体物理学杂志增刊》上。 为做好研究准备，徐甫坤博士、顾盛宏研究员等人基于郭守敬望远镜巡天光谱数据库，通过降低光谱分辨率模拟 未来巡天空间望远镜主巡天光谱，开展预研究工作，并运用机器学习中的变分自编码器算法，对郭守敬望远镜/ 开普勒望远镜天区的巡天数据进行系统分析，通过诊断代表恒星磁场活动指标的氢阿尔法谱线发射强度以及代表 恒星年龄的锂谱线吸收强度，成功识别出500余颗磁活动年轻恒星，涵盖金牛座T型星、磁活动超饱和状态恒星等 多种类型。 研究团队还编制了新发现恒星的详细星表，系统测量其活动水平、年龄、周期，筛选出多个高价值目标源。据介 绍，后期对这些样本开展精细观测，将有助于揭示全对流恒星磁场活动特征与演化规律，为恒星内部磁场发电过 程提供关键观测约束，深化人类对恒星早期演化及行星形成中磁场作用的理解。 在恒星早期演化过程中，原恒星逐渐成形并吸积星周 ...

Core Findings - An international study led by Northwestern University utilized the Hubble Space Telescope to observe a rare "cosmic collision" in a nearby planetary system, revealing that dust clouds may masquerade as planets for years [1][2] - This discovery aids in understanding planetary formation mechanisms and the structural characteristics of asteroids, which is significant for planetary defense initiatives like the Double Asteroid Redirection Test (DART) [1] Research Process - Since 1993, scientists have been observing the star Beta Pictoris, located 25 light-years from Earth, which has a large and complex debris disk, making it an ideal research target [1] - In 2008, a bright point in the debris disk was mistakenly identified as a planet and named "Beta Pictoris b" [1] - In 2023, follow-up observations revealed that this bright point had disappeared, leading to the discovery of a new bright spot, "Beta Pictoris cs2," which showed a 30% increase in brightness [1] Findings on Dust Clouds - The disappearance of "Beta Pictoris b" supports the hypothesis that it was a transient dust cloud generated by a collision, while the new bright spot "Beta Pictoris cs2" further confirms that both are not planets but rather dust clouds formed from the collision of small rocky bodies similar to asteroids [2] - For several years, signals from such dust clouds may closely resemble those from planets, making it crucial to accurately distinguish between transient collision dust clouds and actual exoplanets with the advent of next-generation observational equipment like the Giant Magellan Telescope [2]