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On the rise times in FU Orionis events

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arxiv 2111.12723 v2 pith:7WIUNNGZ submitted 2021-11-24 astro-ph.GA astro-ph.EPastro-ph.SR

On the rise times in FU Orionis events

classification astro-ph.GA astro-ph.EPastro-ph.SR
keywords findflybyobservedodotorionisrisesimulationsaccretion
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We examine whether stellar flyby simulations can initiate FU Orionis outbursts using 3D hydrodynamics simulations coupled to live Monte Carlo radiative transfer. We find that a flyby where the secondary penetrates the circumprimary disc triggers a 1-2 year rise in the mass accretion rate to $10^{-4}~{\rm M_{\odot}~ yr^{-1}}$ that remains high ($\gtrsim 10^{-5}~{\rm M_{\odot}~yr^{-1}}$) for more than a hundred years, similar to the outburst observed in FU Ori. Importantly, we find that the less massive star becomes the dominant accretor, as observed.

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