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@ARTICLE{Pfalzner:902546,
      author       = {Pfalzner, Susanne and Paterson, Dylan and Bannister,
                      Michele T. and Zwart, Simon Portegies},
      title        = {{I}nterstellar {O}bjects {F}ollow the {C}ollapse of
                      {M}olecular {C}louds},
      journal      = {The astrophysical journal / 1},
      volume       = {921},
      number       = {2},
      issn         = {0004-637X},
      address      = {London},
      publisher    = {Institute of Physics Publ.},
      reportid     = {FZJ-2021-04348},
      pages        = {168 -},
      year         = {2021},
      abstract     = {Interstellar objects (ISOs), the parent population of
                      1i/'Oumuamua and 2i/Borisov, are abundant in the
                      interstellar medium of the Milky Way. This means that the
                      interstellar medium, including molecular-cloud regions, has
                      three components: gas, dust, and ISOs. From observational
                      constraints of the field density of ISOs drifting in the
                      solar neighborhood, we infer that a typical molecular cloud
                      of 10 pc diameter contains some 1018 ISOs. At typical sizes
                      ranging from hundreds of meters to tens of kilometers, ISOs
                      are entirely decoupled from the gas dynamics in these
                      molecular clouds. Here we address the question of whether
                      ISOs can follow the collapse of molecular clouds. We perform
                      low-resolution simulations of the collapse of molecular
                      clouds containing initially static ISO populations toward
                      the point where stars form. In this proof-of-principle
                      study, we find that the interstellar objects definitely
                      follow the collapse of the gas—and many become bound to
                      the new-forming numerical approximations to future stars
                      (sinks). At minimum, $40\%$ of all sinks have one or more
                      ISO test particles gravitationally bound to them for the
                      initial ISO distributions tested here. This value
                      corresponds to at least 1010 actual ISOs being bound after
                      three initial freefall times. Thus, ISOs are a relevant
                      component of star formation. We find that more massive sinks
                      bind disproportionately large fractions of the initial ISO
                      population, implying competitive capture of ISOs. Sinks can
                      also be solitary, as their ISOs can become unbound
                      again—particularly if sinks are ejected from the system.
                      Emerging planetary systems will thus develop in remarkably
                      varied environments, ranging from solitary to richly
                      populated with bound ISOs.},
      cin          = {JSC},
      ddc          = {520},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511)},
      pid          = {G:(DE-HGF)POF4-5111},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000717791300001},
      doi          = {10.3847/1538-4357/ac0c10},
      url          = {https://juser.fz-juelich.de/record/902546},
}