English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The appearance of interstellar objects (ISOs) in the Solar System -- andspecifically the arrival of 1I/'Oumuamua -- points to a significant numberdensity of free-floating bodies in the solar neighborhood. We review thedetails of 'Oumuamua's pre-encounter galactic orbit, which intersected theSolar System at very nearly its maximum vertical and radial excursion relativeto the galactic plane. These kinematic features are strongly emblematic ofnearby young stellar associations. We obtain an a-priori order-of-magnitude ageestimate for 'Oumuamua by comparing its orbit to the orbits of 50,899 F-typestars drawn from Gaia DR2; a diffusion model then suggests a $\sim$ 35 Myrdynamical age. We compare 'Oumuamua's orbit with the trajectories of individualnearby moving groups, confirming that its motion is fully consistent withmembership in the Carina (CAR) moving group with an age around 30 Myr.  We conduct Monte Carlo simulations that trace the orbits of test particlesejected from the stars in the Carina association. The simulations indicate thatin order to uniformly populate the $\sim10^6$ pc$^3$ volume occupied by CARmembers with the inferred number density, $n=0.2\,{\rm AU}^{-3}$, of ISOsimplied by Pan-STARRS' detection of 'Oumuamua, the required ejection mass is$M\sim 500$ $M_{\rm Jup}$ per known star within the CAR association. Thissuggests that the Pan-STARRS observation is in significant tension withscenarios that posit 'Oumuamua's formation and ejection from a protostellardisk.

Evidence Suggesting that 'Oumuamua is the ~30 Myr-old product of a Molecular Cloud