IGR J12580+0134: A Possible Repeated Partial Tidal Disruption Event Inferred from Late-Time Radio Re-brightenin
Huazhong University of Science and Technology（华中科技大学）；Shanghai Astronomical Observatory, Chinese Academy of Sciences（中国科学院上海天文台）；Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台）；University of Science and Technology of China（中国科学技术大学）
Po Ma, Shao-Yu Fu, Linhui Wu, Wei-Hua Lei, Qiang Yuan
重复部分潮汐瓦解事件（pTDEs）为研究超大质量黑洞周围的恒星轨道和间歇性质量损失提供了直接探针，但可靠识别需要多波段和多历元证据。我们利用多历元Karl G. Jansky VLA观测以及Swift/XRT和NICER的X射线约束，研究了NGC 4845中核瞬变源IGR J12580+0134的晚期射电再增亮是否可解释为重复pTDE。通过对射电数据的系统分析，我们识别出两个明确的射电耀发和一个可能的第三次晚期再增亮耀发。使用马尔可夫链蒙特卡洛拟合对第二个耀发进行同步辐射余辉框架建模，结果与亚相对论性外流一致，其特征速度约为v ≃ 0.3c，各向同性等效动能约为10^50 erg，以及近似恒定密度的核周介质。在2016年射电耀发期间，Swift/XRT未探测到显著的同期增亮，而2023年NICER的微弱耀发表明存在间歇性低水平吸积。我们还考虑了晚期射电再增亮的几种可能解释，发现重复pTDE情景为观测现象提供了更自然的整体解释。鉴于目前数据覆盖稀疏，持续的灵敏射电和X射线监测对于检验这一解释并寻找未来重新激活至关重要。
英文摘要：
Repeating partial tidal disruption events (pTDEs) provide a direct probe of stellar orbits and episodic mass loss around supermassive black holes, but robust identification requires multi-band and multi-epoch evidence. %consistent with a single physical origin. We investigate whether the late-time radio rebrightening of the nuclear transient IGR~J12580+0134 in NGC~4845 can be explained as a repeating pTDE, using multi-epoch Karl G.\ Jansky VLA observations together with X-ray constraints from \textit{Swift}/XRT and \textit{NICER}. Through a systematic analysis of the radio data, we identify two well-defined radio flares and a possible third late-time rebrightening flare. Modeling the second flare with a synchrotron afterglow framework using Markov Chain Monte Carlo fitting is consistent with a sub-relativistic outflow with a characteristic velocity of order ${v \simeq 0.3c}$, an isotropic-equivalent kinetic energy of order ${10^{50}}$ erg, and an approximately constant-density circumnuclear medium. No significant contemporaneous brightening is detected by \textit{Swift}/XRT during the 2016 radio flare, while faint \textit{NICER} flares in 2023 suggest intermittent low-level accretion. We also considered several possible interpretations for the late-time radio rebrightening, and found that the repeated pTDE scenario provides a more natural overall explanation for the observed phenomenology. Given the currently sparse data coverage, continued sensitive radio and X-ray monitoring will be essential to test this interpretation and to search for future reactivations.
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）
Repeated Tidal Interactions between Stars and Supermassive Black Holes: Mass Transfer, Stability, and Implications for Repeating Partial Tidal Disruption Events
Large-amplitude modulations and hours-timescale variability in the early X-ray light curve of a tidal disruption flare
Max-Planck-Institut für extraterrestrische Physik（马克斯·普朗克地外物理研究所）；Università degli Studi di Milano（米兰大学）；INFN, Sezione di Milano-Bicocca（意大利国家核物理研究院米兰-比可卡分部）；Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences（波兰科学院尼古拉·哥白尼天文学中心）；International Centre for Radio Astronomy Research - Curtin University（西澳大学国际射电天文研究中心）；Leibniz-Institut für Astrophysik Potsdam（波茨坦莱布尼茨天体物理研究所）
Successive Partial Disruptions with Orbital Precession in a White Dwarf-Black Hole System for Repeating GRB 250702B
Astronomical Institute, Graduate School of Science, Tohoku University（东北大学理学研究科天文学研究所）；Department of Astronomy, School of Science, The University of Tokyo（东京大学理学部天文学科）
MUSE IFU observations of galaxies hosting Tidal Disruption Events
University of Warwick（华威大学）；DTU Space, National Space Institute, Technical University of Denmark（丹麦技术大学国家空间研究所）；University of Turku（图尔库大学）；University of Birmingham（伯明翰大学）；Queens University Belfast（贝尔法斯特女王大学）；European Southern Observatory（欧洲南方天文台）；Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA)（天体物理学跨学科探索与研究中心）；Millennium Institute of Astrophysics MAS（天体物理千年研究所）；Universidad de Tarapacá（塔拉帕卡大学）；The University of Hong Kong（香港大学）；Institut d’Estudis Espacials de Catalunya (IEEC)（加泰罗尼亚空间研究所）；Institute of Space Sciences (ICE, CSIC)（空间科学研究所）；Universidad Diego Portales（迭戈波特莱斯大学）；Universidad Nacional Autónoma de México（墨西哥国立自治大学）；Instituto de Astrofísica de Canarias（加那利天体物理研究所）
Diverse Emission Patterns from Precessing Super-Eddington Disks Formed in Tidal Disruption Events
The University of Hong Kong（香港大学）；The Hong Kong Institute for Astronomy and Astrophysics, The University of Hong Kong（香港大学香港天体物理研究所）；Shenzhen Institute of Research and Innovation, The University of Hong Kong（香港大学深圳研究院）
Early Identification of Optical Tidal Disruption Events: A science module for the Fink broker
IRAP, Université de Toulouse, CNRS, CNES, UPS（图卢兹大学 IRAP）；Institute of Physics of the Czech Academy of Sciences（捷克科学院物理研究所）；The Oskar Klein Centre, Department of Astronomy, Stockholm University（斯德哥尔摩大学奥谢·克莱因中心天文学系）；European Space Agency (ESA), European Space Astronomy Centre (ESAC)（欧洲空间局欧洲空间天文中心）；Université Clermont Auvergne, CNRS, LPCA（克莱蒙奥弗涅大学 LPCA）；Université Paris-Saclay, CNRS/IN2P3, IJCLab（巴黎萨克雷大学 IJCLab）；Lomonosov Moscow State University, Sternberg Astronomical Institute（莫斯科罗蒙诺索夫国立大学斯滕伯格天文研究所）；Centre for Astrophysics and Supercomputing, Swinburne University of Technology（斯威本科技大学天体物理学与超级计算中心）
