Fast Optical Transients from Stellar-mass Black Hole Tidal Disruption Events in Young Star Clusters
Fast Optical Transients from Stellar-mass Black Hole Tidal Disruption Events in Young Star Clusters
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DOI：
10.3847/1538-4357/abeb14
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
K. Kremer;Wenbin Lu;A. Piro;S. Chatterjee;F. Rasio;Claire S. Ye
中科院分区：
文献类型：
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作者：
K. Kremer;Wenbin Lu;A. Piro;S. Chatterjee;F. Rasio;Claire S. Ye
观测证据表明，大多数恒星可能诞生于星团或星群中。在这些密集的环境中，动态相互作用导致了高频率的恒星近距离接触。最近的各种观测和理论迹象表明，恒星质量黑洞可能存在，并在所有质量的星团中发挥积极的动力学作用。在这项研究中，我们探索了年轻星团中恒星质量黑洞对主序星的潮汐破坏。我们计算了一套超过3000个独立的n体模拟，涵盖了一系列的团簇质量，金属丰度和半质量半径。我们发现恒星质量黑洞潮汐破坏事件（TDEs）在本地宇宙的年轻星团中以大约200 Gpc−3 yr−1的总体速率发生。这些tde预计有几个特征，即快速上升时间为每天10个，峰值x射线亮度至少为1044 erg s - 1，明亮的光学亮度（大约1041-1044 erg s - 1）与盘风的再处理有关。特别是，我们展示了这些事件与新兴的快速蓝色光学瞬态有许多共同的特征。
Observational evidence suggests that the majority of stars may have been born in stellar clusters or associations. Within these dense environments, dynamical interactions lead to high rates of close stellar encounters. A variety of recent observational and theoretical indications suggest stellar-mass black holes may be present and play an active dynamical role in stellar clusters of all masses. In this study, we explore the tidal disruption of main-sequence stars by stellar-mass black holes in young star clusters. We compute a suite of over 3000 independent N-body simulations that cover a range of cluster mass, metallicity, and half-mass radii. We find stellar-mass black hole tidal disruption events (TDEs) occur at an overall rate of up to roughly 200 Gpc−3 yr−1 in young stellar clusters in the local universe. These TDEs are expected to have several characteristic features, namely, fast rise times of order a day, peak X-ray luminosities of at least 1044 erg s−1, and bright optical luminosities (roughly 1041–1044 erg s−1) associated with reprocessing by a disk wind. In particular, we show these events share many features in common with the emerging class of Fast Blue Optical Transients.