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Predicting Interstellar Object Chemodynamics with Gaia

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arxiv 2402.04904 v2 pith:X5ZK3QFO submitted 2024-02-07 astro-ph.EP astro-ph.GA

Matthew J. Hopkins , Michele T. Bannister , Chris Lintott This is my paper · ORCID
classification astro-ph.EPastro-ph.GA
keywords distributionmovingwillgaiagalacticgroupinterstellarisos
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The interstellar object population of the Milky Way is a product of its stars. However, what is in fact a complex structure in the Solar neighbourhood has traditionally in ISO studies been described as smoothly distributed. Using a debiased stellar population derived from the Gaia DR3 stellar sample, we predict that the velocity distribution of ISOs is far more textured than a smooth Gaussian. The moving groups caused by Galactic resonances dominate the distribution. 1I/`Oumuamua and 2I/Borisov have entirely normal places within these distributions; 1I is within the non-coeval moving group that includes the Matariki (Pleiades) cluster, and 2I within the Coma Berenices moving group. We show that for the composition of planetesimals formed beyond the ice line, these velocity structures also have a chemodynamic component. This variation will be visible on the sky. We predict that this richly textured distribution will be differentiable from smooth Gaussians in samples that are within the expected discovery capacity of the Vera C. Rubin Observatory. Solar neighbourhood ISOs will be of all ages and come from a dynamic mix of many different populations of stars, reflecting their origins from all around the Galactic disk.

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Cited by 2 Pith papers

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

  1. He awa whiria: the tidal streams of interstellar objects

    astro-ph.EP 2024-11 conditional novelty 6.0 of 10

    Interstellar objects form tidal streams in the Galaxy, and future surveys are more likely to see multiple objects from the same star cluster than from the same star.

  2. Fast Radio Bursts and Interstellar Objects

    astro-ph.HE 2024-11 conditional novelty 5.0 of 10

    Interstellar object impacts onto neutron stars are a feasible source of some non-repeating fast radio bursts, with rates, durations, and energies consistent with observations.

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