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）
Yuri Sato, Rin Oikawa, Kazuma Kato, Tatsuya Matsumoto, Kazumi Kashiyama
The peculiar gamma-ray burst GRB 250702B is the longest event ever observed, lasting about one day and exhibiting four prompt-emission flares of $\sim100$ s with irregular recurrence intervals of at least one hour. To explain this hierarchy of timescales, we consider a scenario in which a stellar object undergoes repeated partial tidal disruptions by a black hole (BH). We find that if a white dwarf (WD) is on a highly eccentric orbit ($e\approx0.97$) around an intermediate-mass black hole (BH) with $M_{\rm BH}\lesssim10^{6}\,M_\odot$ and $a = 50\,R_\odot\left(M_{\rm BH}/10^{6}\,M_\odot\right)^{1/3}$, the observed properties of GRB 250702B can be naturally reproduced. In this framework, the duration of each flare is determined by the viscous accretion timescale of material stripped near pericenter, with a typical mass $ΔM \approx 2\times10^{-2}\,M_\odot$. The minimum recurrence time corresponds to the orbital period, while the total activity period is set by the secular orbital evolution timescale leading to the complete disruption of the WD. Furthermore, if $M_{\rm BH}\gtrsim10^{5}\,M_\odot$ and the orbit has a minimum polar angle relative to the BH equatorial plane of $θ_{\rm min}\gtrsim0.12 {\rm rad}$, relativistic frame dragging induces $\gtrsim0.1$ rad precession of the orbital angular momentum between successive pericenter passages, comparable to a typical GRB jet half-opening angle, resulting in intermittent alignment with the observer and irregular flare spacing. The WD experiences $\approx40$ jet-launch episodes before complete disruption, but only four are expected to be observed on-axis. The remaining off-axis jets become visible at late times, enhancing the radio afterglow by about an order of magnitude, providing a testable prediction of this scenario.
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Rapid onset of a Comptonisation zone in the repeating tidal disruption event XMMSL2 J140446.9-251135
Telespazio UK for ESA（ESA英国泰莱斯帕齐奥）；Schmidt Sciences（施密特科学）；Space Telescope Science Institute（太空望远镜科学研究所）；Leiden Observatory, Leiden University（莱顿大学莱顿天文台）；University of Arizona（亚利桑那大学）；Max-Planck-Institut für extraterrestrische Physik（马普地外物理研究所）；University of Hertfordshire（赫特福德大学）；University of Oxford（牛津大学）；Centro de Astrobiología (CAB), CSIC-INTA（CSIC-INTA天体生物学中心）；ESA（欧洲空间局）；SERCO for ESA（ESA塞科服务）
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Are most detected tidal disruption events partial?
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A Disappearing Act: Constraints From "Missing" Flares of Repeating Partial TDE Candidates
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