Origin of Interstellar Object A/2017 U1 in a Nearby Young Stellar Association?

TL;DR

This paper proposes that interstellar object A/2017 U1 originated from a young stellar association's protoplanetary disk, formed there around 45 million years ago, and was ejected with low velocity, suggesting the Solar System may encounter similar objects.

Contribution

It introduces a new hypothesis linking A/2017 U1's origin to specific young stellar associations and details its formation and ejection process.

Findings

A/2017 U1 likely formed in a young stellar association.

The object was ejected with low velocity (~1-2 km/sec).

The Solar System may encounter more such objects.

Abstract

We suggest that the kinematics and properties of interstellar object A/2017 U1 point towards its formation in a protoplanetary disk in the ~45 Myr-old Carina or Columba young stellar associations, and subsequent ejection with a low peculiar velocity (1-2 km/sec) during or soon after planet formation inside the ice line. This scenario predicts that the Solar System will encounter more such objects with radiants similar to that of A/2017 U1.