Features of Gaia DR3 Spectroscopic Binaries: Tidal circularization of main-sequence stars

Add to your list(s) Download to your calendar using vCal

• Dolev Bashi
• Wednesday 01 November 2023, 13:40-14:05
• The Hoyle Lecture Theatre + Zoom .

If you have a question about this talk, please contact Hannah Uebler.

The recent release of Gaia single-lined spectroscopic binaries (SB1) surpasses any prior binary samples by almost two orders of magnitude, 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 to validate the SB1 orbits and how it was exploited to examine tidal circularization processes in main-sequence stars. Previous studies pointed out that many observed samples of short-period binaries display a cut-off period, Pcut, such that almost all binaries with periods shorter than Pcut have circular orbits. This feature is probably due to long-term circularization processes induced by tidal interaction between the two stars of each binary. Using the Gaia MS spectroscopic orbits sample, we have found that the Pcut does not depend on the stellar age but varies with stellar temperature. If indeed true, this has far-reaching implications for binary and exoplanet circularization, synchronization, and alignment theory.

This talk is part of the Institute of Astronomy Seminars series.

This talk is included in these lists:

• Combined External Astrophysics Talks DAMTP
• Cosmology lists
• Cosmology, Astrophysics and General Relativity
• Institute of Astronomy Seminars
• Institute of Astronomy Talk Lists
• Kavli Institute for Cosmology Talk Lists
• Priscilla
• The Hoyle Lecture Theatre + Zoom

Note that ex-directory lists are not shown.