Kolloquium: Coryn Bailer-Jones (MPIA)
Tracing the origins of interstellar objects
Abstract: The first two interstellar objects (ISOs), 1I/'Oumuamua and 2I/Borisov, were discovered in 2017 and 2019 as they passed within a couple of astronomical units of the Earth and Sun. Using ground-based and HST data to reconstruct their orbits, together with Gaia data to trace back the positions of stars in the solar neighbourhood, we searched for stars that encountered these ISOs in the past (Bailer-Jones et al. 2018, 2020). A close, slow encounter could indicate that the ISO originated from that stellar system. We identified some such encounters, in particular one at 0.07 pc for 2I/Borisov. But how likely is this to be the parent star? What factors do we need to take into account to determine this? What are the prospects for more confident detections in the future? And what are ISOs anyway?
29. April 2021, 14:30 – 15:30
Kolloquium Zoom Raum