A concordance scenario for the observed neutrino from a tidal disruption event

Walter Winter, Cecilia Lunardini

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

During a tidal disruption event, a star is torn apart by the tidal forces of a supermassive black hole, with about 50% of the star’s mass eventually accreted by the black hole. The resulting flare can, in extreme cases of super-Eddington mass accretion, result in a relativistic jet1–4. While tidal disruption events have been theoretically proposed as sources of high-energy cosmic rays5,6 and neutrinos7–14, stacking searches indicate that their contribution to the diffuse extragalactic neutrino flux is very low15. However, a recent association of a track-like astrophysical neutrino (IceCube-191001A16) with a tidal disruption event (AT2019dsg17) indicates that some tidal disruption events can accelerate cosmic rays to petaelectronvolt energies. Here we introduce a phenomenological concordance scenario with a relativistic jet to explain this association: an expanding cocoon progressively obscures the X-rays emitted by the accretion disk, while at the same time providing a sufficiently intense external target of backscattered X-rays for the production of neutrinos via proton–photon interactions. We also reproduce the delay (relative to the peak) of the neutrino emission by scaling the production radius with the black-body radius. Our energetics and assumptions for the jet and the cocoon are compatible with expectations from numerical simulations of tidal disruption events.

Original languageEnglish (US)
Pages (from-to)472-477
Number of pages6
JournalNature Astronomy
Volume5
Issue number5
DOIs
StatePublished - May 2021

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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