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@MASTERSTHESIS{AizpuruVargas:888554,
      author       = {Aizpuru Vargas, Luis Lauro},
      title        = {{I}nvestigation on gravitational star-disk encounters
                      producing ʻ{O}umuamua and {B}orisov-like {I}nterstellar
                      {O}bjects},
      school       = {University Bonn},
      type         = {Masterarbeit},
      reportid     = {FZJ-2020-05018},
      pages        = {85 p.},
      year         = {2020},
      note         = {Masterarbeit, University Bonn, 2020},
      abstract     = {The recent discovery of two Inter-Stellar Objects (ISO) in
                      our own Solar System has promptedastronomers to come up with
                      theoretical explanations on how they are produced. Most
                      newlyformed stars are initially surrounded by a
                      protoplanetary disk. The main hypothesis is thatthese ISOs
                      were planetesimals in such disks and that through one
                      mechanism or another becameunbounded from their host stellar
                      system. These same stars and their disks are
                      preferentiallyformed in stellar clusters. The gravitational
                      effects that result from the interaction betweendisks and
                      stars are thus common and relevant for the understanding of
                      the fate of such disks.Amongst these mechanisms there is the
                      gravitational stellar fly-by encounter. The
                      partialdestruction of the disk by the perturber star
                      produces a varying number of unbounded plan-etesimals.
                      Several studies have looked into the effects of stellar
                      fly-bys on disks both for theco-planar prograde case and for
                      inclined retrograde cases. They investigated properties such
                      asfinal disk size or final fate of the test particles.
                      However, the particles that become unboundhave attracted
                      little attention so far. This work focuses on the particles
                      that become unboundduring such fly-bys, contributing to the
                      ISO population. We perform numerical simulationsof a range
                      of parabolic inclined encounters with varying pertuber star
                      masses and periastrondistances for the encounters. The
                      parameter space explored in this work is relevant for a
                      typ-ical young open stellar cluster environment. Here we
                      focus on the relative amount and thevelocities of ISOs
                      produced during such fly-bys. We found that the velocity
                      distribution ofunbounded test particles varies according to
                      the different possible combination of
                      parameters.Nonetheless, the final ejection velocities were
                      found to be in the range between 0.3 km/s and3.0 km/s. Using
                      the results of this particular work along with the available
                      literature on thevelocities of ISOs produced by other
                      sources, we can make a quantitative distinction betweenthe
                      different types of ISOs. As a follow up study, more precise
                      cluster simulations accountingfor the IMF function, binary
                      populations and viscous disks would provide a more realistic
                      andcomprehensive study of the production of ISOs in
                      clusters.},
      cin          = {JSC},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511)},
      pid          = {G:(DE-HGF)POF3-511},
      typ          = {PUB:(DE-HGF)19},
      url          = {https://juser.fz-juelich.de/record/888554},
}