论文标题
在30 MYR OPEN集群IC 4665中搜索碎屑光盘
Searching for debris discs in the 30 Myr open cluster IC 4665
论文作者
论文摘要
上下文：旋转年轻恒星的碎屑盘是了解尘埃演化和行星形成过程的关键。我们利用基于Gaia和舞蹈调查的附近30个MYR IC 4665的最新会员分析，以重新审视该集群的光盘种群。 目的：我们旨在使用Spitzer（MIPS和IRAC）和明智的光度法研究IC 4665的光盘群体。 方法：我们使用几个带有经验光电序列的颜色彩色图来检测红外过量的来源。独立地，我们还与虚拟观测台SED分析仪（VOSA）一起拟合候选碎片盘的光谱分布（SED），该分析仪能够自动检测红外过量并提供有效的温度估计。 结果：我们发现六个候选人杂物碟主机（五个带有MIPS，一名具有明智之举），其中两个是新候选人。我们估计，B-A星的光盘分数为24 $ \ pm $ 10 \％，其中预计将完成样品。这类似于其他类似年龄群（上人为狼疮，下半人马座Crux，$β$ Pictoris移动组和pleiades）的报道。对于太阳能型恒星，我们发现磁盘分数为9 $ \ pm $ 9％，低于在相当年龄的地区观察到的磁盘分数。 结论：我们的候选人碎片盘主机是与ALMA或未来的James Webb太空望远镜（JWST）一起研究的绝佳目标。
Context: Debris discs orbiting young stars are key to understand dust evolution and the planetary formation process. We take advantage of a recent membership analysis of the 30 Myr nearby open cluster IC 4665 based on the Gaia and DANCe surveys to revisit the disc population of this cluster. Aims: We aim to study the disc population of IC 4665 using Spitzer (MIPS and IRAC) and WISE photometry. Methods: We use several colour-colour diagrams with empirical photospheric sequences to detect the sources with an infrared excess. Independently, we also fit the spectral energy distribution (SED) of our debris disc candidates with the Virtual Observatory SED analyser (VOSA) which is capable of automatically detecting infrared excesses and provides effective temperature estimates. Results: We find six candidates debris disc host-stars (five with MIPS and one with WISE) and two of them are new candidates. We estimate a disc fraction of 24$\pm$10\% for the B-A stars, where our sample is expected to be complete. This is similar to what has been reported in other clusters of similar ages (Upper Centaurus Lupus, Lower Centaurus Crux, the $β$ Pictoris moving group, and the Pleiades). For solar type stars we find a disk fraction of 9$\pm$9%, lower than that observed in regions with comparable ages. Conclusions: Our candidates debris disc host-stars are excellent targets to be studied with ALMA or the future James Webb Space Telescope (JWST).
