210 citations · 678 across the 40 of their papers we have counts for
7 papers · 1 filter
The significance of Halley's Comet in the Bayeux Tapestry
Michael Lewis, Simon Portegies Zwart
A comet appears in the Bayeux Tapestry between the scene showing the death of the English king Edward the Confessor and the election of his successor, Harold Godwinson. The Tapestr…
A Systematic North-South asymmetry in the Steady-state Climate of rapidly-rotating Oblique Water Worlds
Y Wu, S. Portegies Zwart, H Dijkstra
Planetary obliquity (axial tilt) plays an important role in regulating the climate evolution and habitability of water-covered planets. Despite the suspicion of large obliquities i…
A Resonant Beginning for the Solar System Terrestrial Planets
Shuo Huang, Chris Ormel, Simon Portegies Zwart +2
In the past two decades, transit surveys have revealed a class of planets with thick atmospheres -- sub-Neptunes -- that must have completed their accretion in protoplanet disks. W…
Stability of a cluster-disrupted mean-motion resonance (chain) in HR 8799 and PDS 70
Brent Maas, Shuo Huang, Simon Portegies Zwart
HR~8799 is a planetary system with four planets potentially in a mean-motion resonance chain. It is unclear from the observations if they are in mean-motion resonance. Similarly, P…
Oort Cloud Ecology. III. The Sun left the parent star cluster shortly after the giant planets formed
Simon Portegies Zwart, Shuo Huang
The Sun was born in a clustered environment with 10,000 other stars. Being an isolated star today, the Sun must have left the nest. We do not directly know when that happened, how…
Reinforcement Learning for Adaptive Time-Stepping in the Chaotic Gravitational Three-Body Problem
Veronica Saz Ulibarrena, Simon Portegies Zwart
Many problems in astrophysics cover multiple orders of magnitude in spatial and temporal scales. While simulating systems that experience rapid changes in these conditions, it is e…
Ripples spreading across the Galactic disc. Interplay of direct and indirect effects of the Sagittarius dwarf impact
Tetsuro Asano, Michiko S. Fujii, Junichi Baba +2
Gaia data have revealed vertically asymmetric phase-space structures in the Milky Way (MW) disc, such as phase spirals, indicating vertical oscillations. These oscillations exhibit…