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Delayed Radio Flares from a Tidal Disruption Event

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arxiv 2102.11290 v1 pith:YFFUQCG6 submitted 2021-02-22 astro-ph.HE

Assaf Horesh , S. Bradley Cenko , Iair Arcavi This is my paper · ORCID
classification astro-ph.HE
keywords radiodelayedflaredisruptionobservationstdesaccretiondetection
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Radio observations of tidal disruption events (TDEs) - when a star is tidally disrupted by a supermassive black hole (SMBH) - provide a unique laboratory for studying outflows in the vicinity of SMBHs and their connection to accretion onto the SMBH. Radio emission has been detected in only a handful of TDEs so far. Here, we report the detection of delayed radio flares from an optically-discovered TDE. Our prompt radio observations of the TDE ASASSN-15oi showed no radio emission until the detection of a flare six months later, followed by a second and brighter flare, years later. We find that the standard scenario, in which an outflow is launched briefly after the stellar disruption, is unable to explain the combined temporal and spectral properties of the delayed flare. We suggest that the flare is due to the delayed ejection of an outflow, perhaps following a transition in accretion states. Our discovery motivates observations of TDEs at various timescales and highlights a need for new models.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Multimessenger Signatures of Tilted, Self-Gravitating, Black Hole Disks

    gr-qc 2026-04 unverdicted novelty 8.0 of 10

    Tilted massive black hole disks develop persistent m=1 nonaxisymmetric modes, launch Blandford-Znajek jets whose collimation depends on spin orientation, and emit gravitational waves in the first self-consistent GRMHD...

  2. The Radio Properties of Extreme Coronal Line Emitters: Constraints on the Sub-parsec Environment

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    About half of low-redshift ECLEs are radio-bright like TDEs/AGN; SED modeling of four shows the ECL gas is clumpy (f_V ~ 10^{-5}-10^{-2}) and spatially distinct from the radio-emitting region.

  3. Tidal Disruption Events with the SKA

    astro-ph.HE 2026-07 unverdicted novelty 4.0 of 10

    With its projected sensitivity, low-frequency coverage, and VLBI, the SKA would shift tidal disruption event radio studies from a handful of events to hundreds, enabling population-level inference on jets, black-hole ...

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