Multiple stars, that is two or more stars composing a gravitationally bound system, are common in the universe.

The high velocity tail of the total velocity distribution of stars provides essential insight into fundamental properties of the Galaxy.

Promotor: P. T. de Zeeuw, Co-promotor: N. Neumayer; G. van de Ven

Until the 1990s, the only known planets were those in our Solar System. Three decades later, several thousand exoplanets have been discovered orbiting stars other than the Sun, and substantial efforts have been made to explore these strange new worlds through spectroscopic analyses of their atmosphe…

Drie Leidse astronomen hebben een handvol sterren ontdekt die van buiten onze Melkweg lijken te komen. Ze deden hun vondst toen ze de database van de Gaia-missie van de ESA doorzochten. Eigenlijk waren ze op zoek naar sterren die uit onze Melkweg proberen te ontsnappen. Die vonden ze ook, maar de indringers…