binary system Archives

Effective (turbulent) viscosity (normalised by a measure of uclc) as a function of the ratio of tidal to convective frequencies as obtained from direct numerical simulations of oscillatory tidal flows interacting with turbulent convection in a local “small-patch” model of a portion of a convective zone of a star (from Fig. 5 in Duguid et al., 2020a). (R indicates how strongly the convection is driven and ao is related to the tidal amplitude.) For very fast tides, νE < 0 indicating tidal anti-dissipation (triangles). -- astro-ph.EP

Astrogeology, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Status Report, Stellar Cartography, Water/Hycean Worlds & Oceanography

Tidal Interactions In Stellar And Planetary Systems

by Keith CowingMay 24, 2025May 24, 2025

Gravitational tidal interactions drive long-term rotational and orbital evolution in planetary systems, in multiple (particularly close binary) star systems and in planetary moon systems.

Colour-Magnitude diagram of the BEBOP sample, using Gaia DR3, with the colour representing our effective temperature. The cooler stars are represented by darker colours, becoming brighter as the effective temperature increases. The expected trend of the brightest, bluest stars (top left) being the hottest, and the dimmer, redder ones (bottom right) being the coolest is seen clearly here. -- astro-ph.SR

Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

BEBOP V. Homogeneous Stellar Analysis of Potential Circumbinary Planet Hosts

by Keith CowingJune 6, 2024June 6, 2024

Planets orbiting binary systems are relatively unexplored compared to those around single stars. Detections of circumbinary planets and planetary systems offer a first detailed view into our understanding of circumbinary […]