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talks.cam : Title to be confirmed cam.ac.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from cam.ac.uk Daily Mail and Mail on Sunday newspapers.
talks.cam : Tides in the high-eccentricity migration of hot Jupiters: Triggering diffusive growth by nonlinear mode interactions cam.ac.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from cam.ac.uk Daily Mail and Mail on Sunday newspapers.
talks.cam : Powering Stellar Magnetism: Energy Transfers in Convective Dynamo of Sun-like Stars cam.ac.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from cam.ac.uk Daily Mail and Mail on Sunday newspapers.
15:00 If you have a question about this talk, please contact Cleo Loi. Multiple-planet systems composed of close-in super-Earth/sub-Neptune-sized planets are ubiquitous, representing a dominant outcome of planet formation. This population exhibits predictable hallmarks of architectural regularity and uniformity, such as low eccentricities and inclinations, similar orbital spacings, and intra-system correlations in planetary masses and radii. On top of this first-order structure, however, these systems also exhibit surprising anomalies that require explanation. Examples include (1) ultra-short period planets, whose extremely-irradiated orbits have been separated off from the rest of their systems; (2) planets piled up wide of mean-motion resonances; and (3) a subset of Neptune-sized planets that show signs of radius inflation. In this talk, I will propose that tidal dynamics can account for these specific anomalies and more. Specifically, I will discuss the critical role of ....
Friday 14 May 2021, 14:00- 15:00 If you have a question about this talk, please contact Cleo Loi. I will present new results on tidal dissipation in stars and planets, mainly focussing on tides in convection zones. The interaction between tidal flows and turbulent convection is often considered important for tidal evolution of binary stars and planetary systems but its efficiency for fast tides (when the tidal frequency exceeds the convective turnover frequency) has long been controversial. I will first describe a new analysis of the energy transfer terms between tidal flows and convection that is verified by idealised Boussinesq and anelastic simulations. One result is that Reynolds stresses involving tidal flow components are unlikely to contribute to dissipation of equilibrium tides. I will then review the results of direct numerical simulations in both local and global models (that study Reynolds stresses involving correlations between convective flow components, w ....