标题： 原行星盘生存时间尺度：对太阳附近100百万年以内年轻星团的盲测调查 显示英文标题

标题： Protoplanetary Disk Survival Time-scales: A Blind Survey of Young Clusters up to 100 Myr in the Solar Vicinity

摘要： 我们使用附近星团中大量年轻恒星物体的样本研究原行星盘寿命。 为了研究盘消散的最后阶段，我们选择了32个位于500 pc以内、年龄在1到100 Myr之间且通过盖亚数据确定成员关系的星团。 源的年龄和质量信息通过光谱能量分布（SED）分析以及不同年龄的演化模型获得。 利用来自2MASS和WISE目录的红外数据，我们采用三种方法在不同波长范围（1.1-22$\mu$m）内识别盘。 我们发现，随着恒星系统的年龄增长，盘分数持续减少，这一趋势在本研究包含的所有波长中都观察到。 然而，随着波长的增加，盘衰减的时间尺度有所增加，较短波长（1.6-4.6$\mu$m）的特征时间尺度为$\tau_{\text{short}}$ = 1.6 $\pm$ 0.1 Myr，而12$\mu$m的特征时间尺度为$\tau_{\text{W3}}$ = 4.4 $\pm$ 0.3 Myr。 这支持了外盘区域演化更慢的观点。 值得注意的是，我们在相对较老的系统（$>$10 Myr）中检测到12$\mu$m和22$\mu$m处的红外过量，其中一些盘的估计年龄高达$\sim$100 Myr。在这些系统中，我们识别出一个在典型消散时间尺度之后仍然存在的完整盘群体。我们还观察到，年轻和年老于40 Myr的星团中，盘宿主恒星的中位质量分别从0.62$M_\odot$降至0.27$M_\odot$，表明低质量恒星周围的盘消散速度较慢。我们利用各种颜色-颜色图识别出33个过渡盘候选体。使用LAMOST DR8光学光谱和H-alpha等值宽度，我们识别出可能的吸积体并估计其质量吸积率，发现大多数都小于10 Myr。 显示英文摘要

摘要： We study the protoplanetary disk lifetimes using a large sample of young stellar objects in nearby clusters. To investigate the final phase of disk dissipation, we selected 32 clusters, located within 500 pc and aged between 1 and 100 Myr, with membership determined using Gaia data. The Age and mass information of the sources are obtained through spectral energy distribution (SED) analysis and using evolutionary models of various ages. Using the IR data from 2MASS and WISE catalogues, we employ three methods to identify disks across the different wavelength regimes (1.1- 22 $\mu$m). We find that disk fraction consistently decreases as stellar systems age, a trend observed across all wavelengths included in this study. However, there is an increase in the time scale of disk decay as wavelength increases, with characteristic timescales of $\tau_{\text{short}}$ = 1.6 $\pm$ 0.1 Myr for shorter wavelengths (1.6-4.6 $\mu$m) versus $\tau_{\text{W3}}$ = 4.4 $\pm$ 0.3 Myr for 12 $\mu$m. This supports the idea that outer disk regions evolve more slowly. Notably, we detect infrared excesses at 12 $\mu$m and 22 $\mu$m in relatively older systems ($>$10 Myr), with some disks with estimated ages up to $\sim$ 100 Myr. Among these, we identify a population of full disks that persist beyond the typical dissipation timescale. We also observe that the median mass of disk-hosting stars decreases from 0.62 $M_\odot$ to 0.27 $M_\odot$ in clusters younger and older than 40 Myr, respectively, indicating slower disk dissipation around lower-mass stars. We identify 33 transitional disk candidates using various color-color diagrams. Using LAMOST DR8 optical spectra and H-alpha equivalent widths, we identify possible accretors and estimate their mass accretion rates, finding most are younger than 10 Myr.