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SUMMARY:Features of Gaia DR3 Spectroscopic Binaries: Tidal circularization
  of main-sequence stars - Dolev Bashi
DTSTART:20231101T134000Z
DTEND:20231101T140500Z
UID:TALK207841@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:The recent release of Gaia single-lined spectroscopic binaries
  (SB1) surpasses any prior binary samples by almost two orders of magnitud
 e\, offering unprecedented depth and breadth in data. In my talk\, I will 
 delve into the latest insights on binary stars' formation and evolution\, 
 drawing on the Gaia SB1 catalogue data. I will introduce the method used t
 o validate the SB1 orbits and how it was exploited to examine tidal circul
 arization processes in main-sequence stars. Previous studies pointed out t
 hat many observed samples of short-period binaries display a cut-off perio
 d\, Pcut\, such that almost all binaries with periods shorter than Pcut ha
 ve circular orbits. This feature is probably due to long-term circularizat
 ion processes induced by tidal interaction between the two stars of each b
 inary. Using the Gaia MS spectroscopic orbits sample\, we have found that 
 the Pcut does not depend on the stellar age but varies with stellar temper
 ature. If indeed true\, this has far-reaching implications for binary and 
 exoplanet circularization\, synchronization\, and alignment theory.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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