恒星年龄并非盘年龄
Stellar age is not disk age
- Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）
- School of Physical and Chemical Sciences, Queen Mary University of London（伦敦玛丽女王大学物理与化学科学学院）
- Department of Physics, University of Connecticut（康涅狄格大学物理系）
- European Southern Observatory（欧洲南方天文台）
- Department of Astronomy, University of Virginia（弗吉尼亚大学天文学系）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
本文质疑将星团盘比例随恒星年龄下降直接解读为盘寿命分布，提出晚期吸积可补充或重建盘，恒星年龄不等于盘年龄，并建议通过同年龄区域盘比例离散来检验。
中文摘要 AI 辅助
恒星形成星团中的盘比例随恒星年龄下降，通常被解读为原行星盘寿命分布。我们认为这种解读缺乏依据，因为晚期吸积可以在坍缩后补充或重新形成盘。为形式化这一观点，我们将盘比例建模为原初盘和环境补充盘的叠加，并考虑供应率的区域间离散。盘比例无法区分长寿盘与反复补充的短命盘。在Sco-Cen中，两种模型均能重现数据，补充模型略优。因此，恒星年龄不必等于盘年龄，恒星可以拥有不同质量、方向和化学组成的连续多代盘。一个关键检验是，相同恒星年龄的区域是否表现出真实的盘比例离散，正如环境补充供应的变化所预测的那样。
英文摘要
Disk fractions in star-forming clusters decline with stellar age, and are routinely read as the lifetime distribution of primordial protoplanetary disks. We argue that this reading is not warranted, because late infall can replenish or reform disks after collapse. To formalize this, we model the disk fraction as a superposition of primordial and environmentally replenished components, with region-to-region dispersion in the supply rate. Disk fractions cannot distinguish a long-lived disk from a short-lived one that is repeatedly replenished. In Sco--Cen both reproduce the data, the replenished model marginally better. Stellar age therefore need not equal disk age, and stars can host successive disk generations with distinct mass, orientation, and chemistry. A key test is whether regions of the same stellar age show a genuine spread in disk fractions, as environmental variation in the replenishment supply predicts.
