Evidence Suggesting That ‘Oumuamua Is the ∼30 Myr Old Product of a Molecular Cloud

  title={Evidence Suggesting That ‘Oumuamua Is the ∼30 Myr Old Product of a Molecular Cloud},
  author={Cheng-Han Hsieh and Gregory P. Laughlin and H{\'e}ctor G. Arce},
  journal={The Astrophysical Journal},
The appearance of interstellar objects (ISOs) in the solar system—and specifically the arrival of 1I/‘Oumuamua—points to a significant number density of free-floating bodies in the solar neighborhood. We review the details of ‘Oumuamua’s pre-encounter Galactic orbit, which intersected the solar system at very nearly its maximum vertical and radial excursion relative to the Galactic plane. These kinematic features are strongly emblematic of nearby young stellar associations. We obtain an a… 
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We fit the upper main sequence of the Praesepe and Hyades open clusters using stellar models with and without rotation. When neglecting rotation, we find that no single isochrone can fit the entire
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The origin of the interstellar object 1I/‘Oumuamua has defied explanation. In a companion paper (Jackson & Desch, 2021), we show that a body of N2 ice with axes 45 m × 44 m × 7.5 m at the time of
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