利用NEOWISE研究长寿命原行星盘（>10 Myr）的变异性

中文摘要 AI 辅助

我们利用NEOWISE对120个长寿命盘候选体（年龄10-100 Myr）和13个已确认的“彼得潘”盘进行了中红外变异性研究，以约束超过标准10 Myr耗散阈值之外的动态盘过程的寿命。通过结合随机通量度量和Stetson $J$指数，我们识别出32个表现出显著变异性的源。这些变源中的大多数属于10-25 Myr年龄范围，表明盘亮度变异性在25 Myr后急剧下降。在形态上，变异性以平均振幅为$\Delta W2 \approx 0.5$星等的不规则波动为特征，这与由嵌入的星子引起的可变消光或内盘翘曲相一致。我们还报告了彼得潘盘中红外与光学变异性之间的强对应关系，文献中所有9个中红外变源均被确认为光学变源。我们的发现揭示了一个包含23个新的长寿命盘候选体的群体，它们保留了活跃的富气体环境，支持了一类稀有系统的存在，这些系统能存活到碎片盘时代。

英文摘要

We present the mid-infrared variability study of 120 long-lived disk candidates (ages 10-100 Myr) and 13 confirmed "Peter Pan" disks using NEOWISE to constrain the longevity of dynamic disk processes beyond the standard 10 Myr dispersal threshold. We identified 32 sources exhibiting significant variability by combining stochastic flux metrics and the Stetson $J$ index. The majority of these variables belong to the 10-25 Myr age range, suggesting a sharp decline in disk brightness variability after 25 Myr. Morphologically, the variability is characterized by irregular fluctuations with mean amplitudes of $ΔW2 \approx 0.5$ mag, consistent with variable extinction or inner disk warping induced by embedded planetesimals. We also report a strong correspondence between mid-infrared and optical variability for the Peter Pan disks, with all 9 mid-IR variables confirmed as optical variables in the literature. Our findings reveal a population of 23 new long-lived disk candidates that retain active, gas-rich environments, supporting the existence of a rarefied class of systems that survive well into the debris disk era.

发表机构

• Indian Institute of Science Education and Research Tirupati（印度科学教育研究所提鲁帕蒂分校）
• Instituto de Astronomía, Universidad Nacional Autónoma de México（墨西哥国立自治大学天文学研究所）

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