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SUMMARY:Tidal dissipation in stars\, with new results on the interaction b
 etween fast tides and convection - Adrian Barker - University of Leeds
DTSTART:20210514T130000Z
DTEND:20210514T140000Z
UID:TALK156754@talks.cam.ac.uk
CONTACT:Cleo Loi
DESCRIPTION:I will present new results on tidal dissipation in stars and p
 lanets\, mainly focussing on tides in convection zones. The interaction be
 tween tidal flows and turbulent convection is often considered important f
 or tidal evolution of binary stars and planetary systems but its efficienc
 y for fast tides (when the tidal frequency exceeds the convective turnover
  frequency) has long been controversial. I will first describe a new analy
 sis of the energy transfer terms between tidal flows and convection that i
 s verified by idealised Boussinesq and anelastic simulations. One result i
 s that Reynolds stresses involving tidal flow components are unlikely to c
 ontribute to dissipation of equilibrium tides. I will then review the resu
 lts of direct numerical simulations in both local and global models (that 
 study Reynolds stresses involving correlations between convective flow com
 ponents\, which likely dominate the interaction)\, which demonstrate that 
 convection can act like an effective viscosity which falls off quadratical
 ly with tidal frequency for fast tides. I will then present calculations s
 tudying tidal dissipation in stellar models with masses in the range 0.1-1
 .6 M_\\odot throughout their evolution. These models incorporate turbulent
  viscosity acting on equilibrium tides and inertial waves in convection zo
 nes\, and internal gravity waves in radiation zones. I will use these resu
 lts to compute tidal quality factors following stellar evolution\, and tid
 al evolutionary timescales\, for the orbital decay of hot Jupiters\, and t
 he spin synchronization and circularization of binary stars.
LOCATION:Online
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