Star-Disk Collisions Unlock Delayed Radio Flares as New Window into Supermassive Black Holes
New mechanism explains years-delayed radio flares in TDEs via EMRI-induced star-disk collisions; preprint model links outflows to accretion physics and QPEs but awaits observational confirmation.
This preprint (arXiv:2605.28928, v1, May 2026) presents a theoretical time-dependent model coupling viscous disk spreading with repeated EMRI-star impacts to explain slow, massive outflows in TDEs that produce radio emission years later. The mechanism differs from jet-delay or viewing-angle scenarios by tying the delay directly to the viscous timescale for the compact TDE disk to reach the EMRI orbit, ejecting material at ~0.02-0.1c with masses up to ~1 solar mass and energies ~10^51 erg. As a preprint it remains unpeer-reviewed, relies on parameterized viscosity and collision efficiency without direct observational fitting, and lacks sample statistics since it is purely analytic/numerical modeling rather than a population study. Related work on QPEs (Miniutti et al. 2019, Nature) shows star-disk collisions can power X-ray eruptions in the same systems, while late-time radio surveys (e.g., Anderson et al. 2020, ApJ) document rebrightenings whose energetics now align with this outflow channel. The model predicts a subset of radio-loud TDEs should overlap with QPE hosts, offering a multi-messenger test once LSST and ngVLA transient streams mature, yet it underplays potential contamination from circumnuclear medium density variations that could mimic the signal.
HELIX: Delayed radio monitoring of TDEs could directly flag EMRI systems, bridging accretion-disk evolution with both radio flares and QPEs in the same black-hole environments.
Sources (3)
- [1]Primary Source(https://arxiv.org/abs/2605.28928)
- [2]Related Source(https://www.nature.com/articles/s41586-019-1556-x)
- [3]Related Source(https://iopscience.iop.org/article/10.3847/1538-4357/ab8d3c)