STRW local: Colloquia


Hypervelocity discoveries with Gaia DR2

Date: 13-06-2019
Time: 11:00 h
Author: Douglas Boubert

Fast stars are the smoking guns of extreme stellar collisions and explosions, but seeing a hypervelocity star in a catalogue can just as often reveal a failing in our methodology as a new astrophysical idea. In this talk I will present both the successes and failures of the hunt for hypervelocity stars in Gaia DR2. I will discuss the discovery of white dwarfs moving at 1000s of km/s, the elimination of hundreds of candidate hypervelocity stars, and the proof of an 8 solar mass star having been ejected from the LMC at 870 km/s. In the latter half of the talk, I will walk you through the mystery of the fastest star in Gaia DR2 and the implications for the analysis of Gaia data.