Thomas Hands
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View article: Capture of interstellar objects II: by the Solar system
Capture of interstellar objects II: by the Solar system Open
Capture of interstellar objects (ISOs) into the Solar system is dominated by ISOs with asymptotic incoming speeds $v_\infty<4\,$km\,s$^{-1}$. The capture rate is proportional to the ISO phase-space density in the Solar vicinity and does no…
View article: Capture of interstellar objects – I. The capture cross-section
Capture of interstellar objects – I. The capture cross-section Open
We study the capture of interstellar objects (ISOs) by a planet–star binary with mass ratio q ≪ 1, semimajor axis ap, orbital speed vc, and eccentricity ep. Very close (slingshot) and wide encounters with the planet are amenable to analyti…
View article: Capture of interstellar objects – II. By the Solar system
Capture of interstellar objects – II. By the Solar system Open
Capture of interstellar objects (ISOs) into the Solar system is dominated by ISOs with asymptotic incoming speeds $v_\infty \lt 4\,$km s−1. The capture rate is proportional to the ISO phase-space density in the Solar vicinity and does not …
View article: Bifurcation of planetary building blocks during Solar System formation
Bifurcation of planetary building blocks during Solar System formation Open
Goldschmidt 2021, Lyon, Session "Chemical geodynamics throughout the Solar System — Combining insights from observations, experiments, analogues, and models", invited talk
View article: Earliest isotopic and chemical bifurcation of planetary building blocks
Earliest isotopic and chemical bifurcation of planetary building blocks Open
Recent astronomical (1,2) and geochemical (3,4) evidence point to early spatial and temporal fragmentation of the planet formation process, whose physical origins remain disputed. Here, using a coupled numerical model, we investigate the i…
View article: Capture of interstellar objects: a source of long-period comets
Capture of interstellar objects: a source of long-period comets Open
We simulate the passage through the Sun–Jupiter system of interstellar objects (ISOs) similar to 1I/‘Oumuamua or 2I/Borisov. Capture of such objects is rare and overwhelmingly from low incoming speeds on to orbits akin to those of known lo…
View article: The fate of planetesimal discs in young open clusters: implications for 1I/’Oumuamua, the Kuiper belt, the Oort cloud, and more
The fate of planetesimal discs in young open clusters: implications for 1I/’Oumuamua, the Kuiper belt, the Oort cloud, and more Open
We perform N-body simulations of the early phases of open cluster evolution including a large population of planetesimals, initially arranged in Kuiper-belt like discs around each star. Using a new, fourth-order, and time-reversible N-body…
View article: A new class of Super-Earths formed from high-temperature condensates: HD219134 b, 55 Cnc e, WASP-47 e
A new class of Super-Earths formed from high-temperature condensates: HD219134 b, 55 Cnc e, WASP-47 e Open
We hypothesize that differences in the temperatures at which the rocky material condensed out of the nebula gas can lead to differences in the composition of key rocky species (e.g. Fe, Mg, Si, Ca, Al, Na) and thus planet bulk density. Suc…
View article: Mass transfer, loss and dynamical evolution of debris discs in young open clusters
Mass transfer, loss and dynamical evolution of debris discs in young open clusters Open
We perform high-N, direct summation N-body simulations of the early phases of open cluster evolution. The stars in our clusters host populations of test particles arranged in Kuiper-belt style planetesimal discs. We evolve the clusters and…
View article: The origin of the structure of large-scale magnetic fields in disc galaxies
The origin of the structure of large-scale magnetic fields in disc galaxies Open
The large-scale magnetic fields observed in spiral disc galaxies are often thought to result from dynamo action in the disc plane. However, the increasing importance of Faraday depolarization along any line of sight towards the galactic pl…
View article: Breaking mean-motion resonances during Type I planet migration
Breaking mean-motion resonances during Type I planet migration Open
We present 2D hydrodynamical simulations of pairs of planets migrating simultaneously in the Type I regime in a protoplanetary disc. Convergent migration naturally leads to the trapping of these planets in mean-motion resonances. Once in r…
View article: The enthralling tale of the formation and evolution of compact planetary systems
The enthralling tale of the formation and evolution of compact planetary systems Open
Of the myriad of insights into exoplanetary systems provided by the Kepler mission, one of the most intriguing new discoveries is that of a class of compact planetary systems which include Kepler-11, Kepler-32 and Kepler-90. In such system…
View article: There might be giants: unseen Jupiter-mass planets as sculptors of tightly packed planetary systems
There might be giants: unseen Jupiter-mass planets as sculptors of tightly packed planetary systems Open
The limited completeness of the Kepler sample for planets with orbital\nperiods $\\gtrsim$ 1 yr leaves open the possibility that exoplanetary systems\nmay host undetected giant planets. Should such planets exist, their dynamical\ninteracti…