晚型星周围星盘的寿命
On the lifetime of discs around late type stars
摘要：
我们解决的问题，是否原行星盘周围的低质量恒星（如M-矮星）可能比他们的太阳型同行更长寿。这个问题与评估这些低质量盘的行星制造潜力特别相关。鉴于年龄测定年轻恒星固有的不确定性，我们提出了一种替代方法，即分析盘轴承低质量恒星的空间分布，并将其与同一星团中的盘轴承太阳型恒星进行比较。两个人口之间的显著年龄差异应反映在其平均最近邻距离（标准化为来源数量）中，其中老年人口应显得更加分散。为此，我们进行了最小生成树（MST）的空间分布的磁盘轴承年轻恒星物体（YSO）在附近的六个低质量恒星形成区的分析。我们发现没有证据表明显着的年龄差异盘轴承低质量（晚于M2）和“太阳型”（早于M2）在这些地区的恒星。我们通过构建和分析合成分形分布，我们发展的速度分散的典型值，我们的结果建模。简单模型与我们的MST分析的比较表明，M星周围的圆盘的寿命与太阳型恒星周围的圆盘相似。此外，一个独立于模型的空间分析的观测结果有力地表明，两个样本之间的任何年龄差异必须小于平均年龄之间的差异盘轴承经典T-Tauri星和盘少弱线T-Tauri星。
英文摘要：
We address the question of whether protoplanetary discs around low mass stars (e.g. M-dwarfs) may be longer lived than their solar-type counterparts. This question is particularly relevant to assess the planet-making potential of these lower mass discs. Given the uncertainties inherent to age-dating young stars, we propose an alternative approach that is to analyse the spatial distribution of disc-bearing low-mass stars and compare it to that of disc-bearing solar-type stars in the same cluster. A significant age difference between the two populations should be reflected in their average nearest neighbour distance (normalised to the number of sources), where the older population should appear more spread out. To this aim, we perform a Minimum Spanning Tree (MST) analysis on the spatial distribution of disc-bearing young stellar objects (YSOs) in six nearby low mass star forming regions. We find no evidence for significant age differences between the disc-bearing low-mass (later than M2) and 'solar-type' (earlier than M2) stars in these regions. We model our results by constructing and analysing synthetic fractal distributions that we evolve for typical values of the velocity dispersions. A comparison of simple models to our MST analysis suggests that the lifetime of discs around M-stars is similar to that of discs around solar-type stars. Furthermore, a model-independent spatial analysis of the observations robustly shows that any age differences between the two samples must be smaller than the average age difference between disc-bearing classical T-Tauri stars and disc-less Weak-Lined T-Tauri stars.
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