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The phenomenon of Near-Death Experiences (NDEs) has mystified and enthralled us ever since Raymond Moody wrote the book,

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...

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 th...

Monday 10 May 2021, 14:00- 15:00 If you have a question about this talk, please contact Cleo Loi. We propose a new formalism to calculate the exchange of energy between tides and a convective flow when the turnover timescale is larger than the tidal period. We argue that the standard picture, in which the tides are described as a mean shear flow which is damped by fluctuating convective eddies, is inconsistent and should be reversed. In other words, the fluctuations are the tidal oscillations and the mean shear flow is provided by the largest convective eddies. The rate at which energy is exc...

Subscribe to receive Zoom link While gas dynamics have been studied in local and global numerical simulations for inner regions ( 10AU) of protoplanetary disks (PPDs), global simulations applicable to outer regions ( 30AU) of PPDs are still lacking. On the other hand, it is revealed in the recent years that the magneto-rotational instability (MRI) is damped or suppressed in a large part of the disk, and hydrodynamic instabilities become crucial to drive turbulence in PPDs. In this talk, I will present our recent results on gas dynamics of outer PPDs through global 2D and 3D non-ideal MHD si...