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The New Astronomical Frontier of Interstellar Objects.

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Area of Science:

  • Astronomy and Astrophysics
  • Planetary Science

Background:

  • The Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST) will increase the detection rate of interstellar objects (ISOs).
  • 'Oumuamua and Borisov are the first confirmed ISOs in our Solar System, with an earlier interstellar meteor detection.
  • Previous studies have not fully explored the mass budget and abundance of ISOs.

Purpose of the Study:

  • To investigate the mass budget of ejected planetesimals implied by 'Oumuamua and Borisov.
  • To estimate the abundance of ISOs as a function of size in the solar neighborhood.
  • To explore observational methods for detecting and differentiating ISOs.

Main Methods:

  • Analysis of mass budget implications from 'Oumuamua and Borisov detections.
  • Modeling ISO abundance as a function of size.
  • Investigating observational signatures of ISOs (e.g., collisions, stellar occultations).
  • Developing a dynamical anisotropy test for ISO ejection speeds.

Main Results:

  • A significant fraction of stellar mass is likely dedicated to producing ISOs.
  • ISOs are predicted to be more numerous than Solar System objects in the Oort cloud.
  • Observational methods for detecting and differentiating ISOs are feasible.

Conclusions:

  • The study predicts a new population of dynamically distinct ISOs from Galactic halo stars.
  • The findings support ongoing and future ISO research, including projects like the Galileo Project.
  • Enhanced ISO detection rates by LSST will provide crucial data for understanding these objects.