论文标题

GAIA EDR3年轻恒星簇中的原星磁盘分数的比较研究

Gaia EDR3 comparative study of protoplanetary disk fractions in young stellar clusters

论文作者

Mendigutía, I., Solano, E., Vioque, M., Balaguer-Nuñez, L., Ribas, A., Huélamo, N., Rodrigo, C.

论文摘要

(删节)年轻恒星周围的原星盘的寿命限制了行星形成时的时间尺度。磁盘耗散时间尺度<10 MYR是通过调查推断出的,该调查为恒星提供了不同年龄段的年轻恒星簇中的圆盘。但是,以前的大多数调查都集中在群集中心〜2 pc内的紧凑区域,为此,考虑外部部分的磁盘分数信息实际上是不存在的。我们旨在测试磁盘分数估计是否会从集群中心周围的扩展区域推断出时是否发生变化。 GAIA EDR3数据和最适合的虚拟天文台(VO)工具-clusterix-用于识别出一个具有radii〜20 PC和〜2 pc的同心视野(FOV)的19年级群集的代表性样本的成员星。我们的分析表明,从紧凑型和扩展区域推断出的内部磁盘分数在〜10%以内,这不支持先前的假设,认为考虑到扩展区域,磁盘分数应该明显更大。提供每个集群中的成员和磁盘星列表,并存储在符合VOO的档案中。还提供了表征整个簇的平均值和图,包括基于Gaia颜色和绝对幅度的HR图。我们的结果涵盖了分析所有分析群集的磁盘分数时探索的最大领域,这意味着它们的完整表征需要使用宽FOV。最终的数据库是对年轻簇的未来详细研究的基准,必须通过使用多波长分析与即将到来的Gaia发行的数据相结合,其磁盘分数必须准确地确定。

(Abridged) The lifetime of protoplanetary disks around young stars limits the timescale when planets form. A disk dissipation timescale < 10 Myr was inferred from surveys providing the fraction of stars with disks in young stellar clusters with different ages. However, most previous surveys focused on the compact region within ~ 2 pc from the clusters' centers, for which the disk fraction information considering the outer part is practically absent. We aim to test if disk fraction estimates change when inferred from an extended region around the clusters' centers. Gaia EDR3 data and a best-suited, Virtual Observatory (VO)-based tool -Clusterix-, are used to identify member stars for a representative sample of 19 young clusters considering two concentric fields of view (FOV) with radii ~ 20 pc and ~ 2 pc. Our analysis reveals that the inner disk fractions inferred from the compact and the extended regions are equal within ~ 10%, which does not support a previous hypothesis proposing that disk fractions should be significantly larger considering extended regions. A list of member and disk stars in each cluster is provided and stored in a VO-compliant archive. Averaged values and plots characterizing the whole clusters are also provided, including HR diagrams based on Gaia colors and absolute magnitudes. Our results cover the largest fields ever probed when dealing with disk fractions for all clusters analysed, and imply that their complete characterization requires the use of wide FOVs. The resulting database is a benchmark for future detailed studies of young clusters, whose disk fractions must be accurately determined by using multi-wavelength analysis potentially combined with data from coming Gaia releases.

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