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Gas Flows Within Cavities of Circumbinary Discs in Eccentric Binary Protostellar Systems
Philipp Mösta, Ronald E. Taam, Paul C. Duffell
The structure and evolution of gas flows within the cavity of a circumbinary disk (CBD) surrounding the stellar components in eccentric binaries are examined via two-dimensional hy…
Common Envelope Evolution of Massive Stars
Paul M. Ricker, Frank X. Timmes, Ronald E. Taam +1
The discovery via gravitational waves of binary black hole systems with total masses greater than has raised interesting questions for stellar evolution theory. Among t…
Pulsational pair-instability supernovae in very close binaries
Pablo Marchant, Mathieu Renzo, Robert Farmer +4
Pair-instability and pulsational pair-instability supernovae (PPISN) have not been unambiguously observed so far. They are, however, promising candidates for the progenitors of the…
Time-dependent Pattern Speeds in Barred Galaxies
Yu-Ting Wu, Daniel Pfenniger, Ronald E. Taam
Based on a high quality -body simulation of a double bar galaxy model, we investigate the evolution of the bar properties, including their size, strength and instantaneous patte…
The growth of stellar mass black hole binaries trapped in an accretion disk of active galactic nuclei
Shu-Xu Yi, K. S. Cheng, Ronald E. Taam
Among the four black hole binary merger events detected by LIGO, six progenitor black holes have masses greater than 20\,. The existence of such massive BHs calls for extr…
A Model for Spectral States and Their Transition in Cyg X-1
Ronald E. Taam, Erlin Qiao, B. F. Liu +1
A new accretion picture based on a small disk surrounding a black hole is developed for the wind-fed source Cyg X-1. The hard and soft spectral states of Cyg X-1 are interpreted in…