Fast, self-consistent stellar stream simulations with basis-function expansions in EXP

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ID: 329629
2026
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Abstract
Abstract We present a fast, self-consistent method for simulating stellar streams using a basis-function expansion technique, within the exp framework. This technique lies between direct N-body and particle spray, providing fast simulations in comparison to direct N-body without the approximations used in particle spray. We find that our method produces physically consistent streams, with key stream properties present, including gaps. Using the speed increase, we create a large grid of simulations over a range of plausible Milky Way stream parameters. From this we study how mass-loss rates depend on initial conditions alongside testing a potential interpolation technique to predict any arbitrary simulation. We also compare our simulations to literature parameterisations of tidal mass-loss rates and find that it reproduces the low tidal frequency (Ωtid) regime well, but predicts systematically lower mass-loss than our simulations at higher Ωtid, with the difference increasing as a function of Ωtid.
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openalex_W7214217949 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Alexander E V Facey, Michael S Petersen
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1818
URL
https://doi.org/10.1093/mnras/stag1818
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