Two X-ray sources were recently discovered by Irwin et al. in compact companions to elliptical galaxies to show ultra-luminous flares with fast rise (~ minute) and decay (~ hour), and with a peak luminosity ~10^{40-41} erg/s. Together with two other sources found earlier, they constitute a new type of fast transients which cannot be attributed to neutron stars but might be due to intermediate-mass black holes (IMBHs; 10^{2-4} M_sun). The flaring behavior is recurrent for at least two sources. If the flare represents a short period of accretion onto an IMBH during the periastron passage of a donor star on an eccentric (i.e., repeating) or parabolic (non-repeating) orbit, we argue that the flare's rise time corresponds to the duration during which the donor's tidally stripped mass joins a residual disk at the pericenter. This duration is in turn equal to three other time scales: the duration of stripping, the sound crossing time of the donor, and the circular orbit time at the pericenter radius. Only a white dwarf can have a sound crossing time as short as one minute. Therefore, the donor must be a white dwarf and it was stripped of ~10^{-10} M_sun upon each passage at several to tens of Schwarzschild radii from the IMBH. The flux decay corresponds to the viscous drainage of the supplied mass toward the hole. Aided with long-term X-ray monitoring, this type of fast transients would be an ideal target for next-generation gravitational wave detectors.
Tidal Stripping of Matter Bound to the Secondary in Extreme Mass-Ratio Inspirals
Inter University Centre for Astronomy and Astrophysics（大学间天文学与天体物理中心）；Indian Institute of Technology, Gandhinagar（甘地纳加尔印度理工学院）；Université Paris Cité, CNRS, Astroparticule et Cosmologie（巴黎西岱大学，法国国家科学研究中心，亚原子粒子与宇宙学）；Gran Sasso Science Institute (GSSI)（格兰萨索科学研究所）；INFN, Laboratori Nazionali del Gran Sasso（意大利国家核物理研究所，格兰萨索国家实验室）
A pulsar escaping an ancient open cluster via tidal stripping
National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；Swinburne University of Technology（斯威本科技大学）；Tsinghua University（清华大学）；Sun Yat-sen University（中山大学）；University of Alberta（阿尔伯塔大学）；INAF – Astrophysics and Space Science Observatory of Bologna（意大利国家天体物理研究所博洛尼亚天文与空间科学观测站）
Radio observations of the tidal disruption event AT2020opy: a luminous non-relativistic outflow encountering a dense circumnuclear medium
潮汐破裂事件（TDEs）发生在恒星过于接近超大质量黑洞并被潮汐引力摧毁时。TDEs的无线电观测跟踪同步辐射流出的材料，可能是从吸积流的内部区域周围的SMBH或潮汐碎屑流喷出。潮汐破裂事件的无线电探测是罕见的，但提供了关于超大质量黑洞的喷流和流出物的发射以及星系中的环核环境的关键信息。本文介绍了TDE AT 2020opy的射电探测，包括用Karl G. Jansky的甚大天线阵（VLA），MeerKAT和升级的巨型米波射电望远镜。AT2020opy是迄今为止报道的最远的热TDE与无线电发射，从建模的同步辐射光谱，我们推断，主机星系有一个更密集的环核介质比其他热TDE在无线电波段检测。基于事件的同步加速器光谱特性的均分分析，我们得出结论，无线电发射流出可能是大约在最初的光学耀斑发生时或之后发射的。我们没有发现外流的相对论运动的证据。这一事件的高光度支持了宿主星系的致密环核介质产生更明亮的无线电发射，其上升到峰值的速度比中心密度较低的星系更快。
Stellar Tidal Disruptions by Newborn Neutron Stars or Black Holes: A Mechanism for Hydrogen-poor (Super)luminous Supernovae and Fast Blue Optical Transients
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）
NTT, Spitzer and Chandra spectroscopy of SDSSJ095209.56+214313.3: the most luminous coronal-line supernova ever observed, or a stellar tidal disruption event ?
Stellar Stripping and Disruption in Disks around Supermassive Black Hole Binaries: Repeating nuclear transients prior to LISA events
Space Telescope Science Institute（太空望远镜科学研究所）；Johns Hopkins University（约翰斯·霍普金斯大学）；Niels Bohr International Academy, Niels Bohr Institute（尼尔斯·玻尔国际学院，尼尔斯·玻尔研究所）；Chungbuk National University（忠北国立大学）；Aoyama Gakuin University（青山学院大学）；University of Zurich（苏黎世大学）
Discovery of crested quasi-periodic eruptions following the most luminous SRG/eROSITA tidal disruption event
Max-Planck-Institut für extraterrestrische Physik（马克斯·普朗克地外物理研究所）；Excellence Cluster ORIGINS（ORIGINS 卓越集群）；School of Physics and Astronomy, Tel Aviv University（特拉维夫大学物理与天文学学院）；Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology（麻省理工学院卡弗里天体物理学与空间研究研究所）；Centro de Astrobiologia (CAB), CSIC-INTA（CSIC-INTA 天体生物学中心）；European Southern Observatory（欧洲南方天文台）
The Jetted Tidal Disruption Event AT2022cmc: Investigating Connections to the Optical Tidal Disruption Event Population and Spectral Subclasses Through Late-Time Follow-up
