On the rise times in FU Orionis events

Abstract

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 $10^{-4}{\mathrm{M}}_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$ that remains high ($\gtrsim 10^{-5}{\mathrm{M}}_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$) 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.

5 pages, 4 figures, accepted for publication in MNRAS, movies available at https://emborchert.github.io/videos, press release available at https://www.monash.edu/science/news/current/astronomers-find-clue-to-solar-system-formation-through-well-known-star

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Cited by in corpus (16)

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• Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): A Panchromatic View of DO Tau's Complex Kilo-au Environment
• The SPHERE view of three interacting twin disc systems in polarised light
• Exciting spiral arms in protoplanetary discs from flybys
• Spectroscopic confirmation of high-amplitude eruptive YSOs and dipping giants from the VVV survey
• Multi-wavelength detection of an ongoing FUOr-type outburst on a low-mass YSO
• 3-D SPH simulations of the FUOR flares in the clumpy accretion model
• Resolving the Binary Components of the Outbursting Protostar HBC 494 with ALMA
• Simulation of the Free Fall of a Gas Stream on a Protoplanetary Disk
• The Effelsberg survey of FU Orionis and EX Lupi objects I. -- Host environments of FUors/EXors traced by NH${}_3$
• Warps survive beyond fly-by encounters in protoplanetary disks. RW Aur A as a case study
• Simulation of images of protoplanetary disks after collision with free-floating planets
• VVV-WIT-13: an eruptive young star with cool molecular features
• Star Formation