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SUMMARY:The changing astrometry of Gaia's unresolved binaries - Zephyr Pen
 oyre
DTSTART:20211006T123000Z
DTEND:20211006T130000Z
UID:TALK162718@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:Even when we cannot resolve two (or more) sources we can often
  still identify a multiple star system from its motion. The Gaia survey ha
 s brought the level of astrometric precision down to the point where binar
 y(+) systems can be found in their thousands. In this talk I'll show how e
 ven in existing data\, limited to single-body fits and the associated erro
 r\, the persistent excess motion caused by a binary translates into an ide
 ntifiable signal. Furthermore the most recent data release (eDR3) allows u
 s to track astrometric errors over time and by comparing to previous obser
 vations allows us to better seperate multiple stellar systems from backgro
 und noise. Finally\, I'll talk about the future capacity of the survey to 
 detect astrometric binaries\, including which pairings of stellar types an
 d compact objects will give the largest signals and most numerous addition
 s to the census of binary systems.
LOCATION:Hybrid Sackler (sign-up needed) + Zoom - Details will be sent by 
 email.
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