Tidal disruption events are common in the Universe, which may occur in various compact star systems and could account for many astrophysical phenomena. Depending on the separation between the central compact star and its companion, either a full disruption or a partial disruption may occur. The partial disruption of a rocky planet around a neutron star can produce kilometer-sized clumps, but the main portion of the planet can survive. The dynamical evolution of these clumps is still poorly understood. In this study, the characteristics of partial disruption of a rocky planet in a highly elliptical orbit around a neutron star is investigated. The periastron of the planet is assumed to be very close to the neutron star so that it would be partially disrupted by tidal force every time it passes through the periastron. It is found that the fragments generated in the process will change their orbits on a time scale of a few orbital periods due to the combined influence of the neutron star and the remnant planet, and will finally collide with the central neutron star. Possible outcomes of the collisions are discussed.
The Tidal Disruption Event AT 2018hyz II: Light Curve Modeling of a Partially Disrupted Star
AT 2018 hyz（=ASASSN-18 zj）是一个位于静止E+A星系核心的潮汐破裂事件（TDE），红移为$z = 0.04573$，首次由全天超新星自动巡天（ASAS-SN）发现。我们提出了瞬态的光学+UV测光，以及X射线光谱和无线电上限。AT 2018 hyz的辐射热光变曲线与其他已知的TDE相当，并且在早期以与$t^{-5/3}$一致的速率下降，发射出$E = 9\times10^{50}$ erg的总辐射能量。在辐射热峰值后约50天，紫外光曲线出现一个过度的凸起，然后在250天后出现一个平坦化。光变曲线显示，在辐射热峰值之后约50天，紫外线中出现了一个过度的凸起，持续了至少100天，这可能与外流有关。我们探测到一个持续存在至少86天的X射线源。X射线光谱显示总未吸收通量为$\sim 4\times10^{-14}$ erg cm $^{-2}$ s $^{-1}$，并且最佳拟合为黑体加幂律模型，光子指数为$Γ= 0.8$。热X射线模型无法解释光子$> 1$ keV，而无线电非探测有利于逆康普顿散射，而不是非热分量的射流。我们使用模块化的开放源滤波器瞬态（MOSFiT）的光学和紫外光曲线模型，并找到一个最适合的黑洞的$5.2\times10^6$ M $_\odot$部分破坏$0.1$ M $_\odot$明星（剥离质量$\sim 0.01$ M $_\odot$推断的…
The Role of Stellar Spin in Repeating Partial Tidal Disruption Events
Syracuse University（雪城大学）；University of Leeds（利兹大学）；Eureka Scientific（尤里卡科学公司）；The George Washington University（乔治华盛顿大学）；Schmidt Sciences（施密特科学）；Space Telescope Science Institute（太空望远镜科学研究所）
Black Hole Survival Guide: Searching for Stars in the Galactic Center That Endure Partial Tidal Disruption
University of California, Santa Cruz（加州大学圣克鲁兹分校）；Cabrillo College（卡布里洛学院）；Wesleyan University（卫斯理安大学）；Northwestern University（西北大学）；University of North Carolina at Chapel Hill（北卡罗来纳大学教堂山分校）
