V. R. Eke
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View article: No dilute core produced in simulations of giant impacts on to Jupiter
No dilute core produced in simulations of giant impacts on to Jupiter Open
A giant impact has been proposed as a possible formation mechanism for Jupiter’s dilute core – the planet’s inferred internal structure in which the transition between its core of heavy elements and its predominantly hydrogen–helium envelo…
View article: REMIX SPH – improving mixing in smoothed particle hydrodynamics simulations using a generalised, material-independent approach
REMIX SPH – improving mixing in smoothed particle hydrodynamics simulations using a generalised, material-independent approach Open
View article: No dilute core produced in simulations of giant impacts on to Jupiter
No dilute core produced in simulations of giant impacts on to Jupiter Open
A giant impact has been proposed as a possible formation mechanism for Jupiter's dilute core -- the planet's inferred internal structure in which the transition between its core of heavy elements and its predominantly hydrogen-helium envel…
View article: Origin of Mars’s moons by disruptive partial capture of an asteroid
Origin of Mars’s moons by disruptive partial capture of an asteroid Open
View article: REMIX SPH -- improving mixing in smoothed particle hydrodynamics simulations using a generalised, material-independent approach
REMIX SPH -- improving mixing in smoothed particle hydrodynamics simulations using a generalised, material-independent approach Open
We present REMIX, a smoothed particle hydrodynamics (SPH) scheme designed to alleviate effects that typically suppress mixing and instability growth at density discontinuities in SPH simulations. We approach this problem by directly target…
View article: Moon-forming impactor as a source ofEarth’s basal mantle anomalies
Moon-forming impactor as a source ofEarth’s basal mantle anomalies Open
Seismic images of Earth’s interior have revealed two continent-sized anomalies with low seismic velocities, known as the large low-velocity provinces (LLVPs), in the lowermost mantle. The LLVPs are often interpreted as intrinsically …
View article: Galaxies-intergalactic medium interaction calculation I: galaxy formation as a function of large-scale environment
Galaxies-intergalactic medium interaction calculation I: galaxy formation as a function of large-scale environment Open
We present the first results of hydrodynamical simulations that follow the formation of galaxies to the present day in nearly spherical regions of radius ~ 20 h^-1 Mpc/h drawn from the Millennium Simulation (Springel et al.). The regions h…
View article: A Recent Impact Origin of Saturn’s Rings and Mid-sized Moons
A Recent Impact Origin of Saturn’s Rings and Mid-sized Moons Open
We simulate the collision of precursor icy moons analogous to Dione and Rhea as a possible origin for Saturn’s remarkably young rings. Such an event could have been triggered a few hundred million years ago by resonant instabilities in a p…
View article: Modeling the Evolution of Lunar Regolith: 2. Growth Rate and Spatial Distribution
Modeling the Evolution of Lunar Regolith: 2. Growth Rate and Spatial Distribution Open
The datasets related to the work of of Modeling the Evolution of Lunar Regolith: 2. Growth Rate and Spatial Distribution. This website contains the derived data in the manuscript of Modeling the Evolut…
View article: Modeling the Evolution of Lunar Regolith: 1. Formation Mechanism Through Individual Simple Impact Craters
Modeling the Evolution of Lunar Regolith: 1. Formation Mechanism Through Individual Simple Impact Craters Open
The production, distribution, and evolution of lunar regolith are critical in deciphering the lunar bombardment history and comprehending the transport of materials across the lunar surface, which are still not well understood. In this stu…
View article: Immediate Origin of the Moon as a Post-impact Satellite
Immediate Origin of the Moon as a Post-impact Satellite Open
The Moon is traditionally thought to have coalesced from the debris ejected by a giant impact onto the early Earth. However, such models struggle to explain the similar isotopic compositions of Earth and lunar rocks at the same time as the…
View article: Dealing with density discontinuities in planetary SPH simulations
Dealing with density discontinuities in planetary SPH simulations Open
Density discontinuities cannot be precisely modelled in standard formulations of smoothed particles hydrodynamics (SPH) because the density field is defined smoothly as a kernel-weighted sum of neighbouring particle masses. This is a probl…
View article: Space-based Measurements of Neutron Lifetime: A Novel Approach to a Long-standing Problem
Space-based Measurements of Neutron Lifetime: A Novel Approach to a Long-standing Problem Open
Free neutrons decay via the weak interaction with a mean lifetime of around 15 minutes. Knowledge of this lifetime is important as it provides constraints on the unitarity of the CKM matrix and is a key parameter for studies of Big-Bang nu…
View article: Measurement of the free neutron lifetime using the neutron spectrometer on NASA's Lunar Prospector mission
Measurement of the free neutron lifetime using the neutron spectrometer on NASA's Lunar Prospector mission Open
We use data from the Lunar Prospector Neutron Spectrometer to make the second space-based measurement of the free neutron lifetime finding $τ_n=887 \pm 14_\text{stat}{\:^{+7}_{-3\:\text{syst}}}$ s, which is within 1$σ$ of the accepted valu…
View article: Solar-System-Wide Significance of Mars Polar Science
Solar-System-Wide Significance of Mars Polar Science Open
Mars Polar Science is an integrated, compelling system that serves as a nearby analogue to numerous other planets, supports human exploration, and habitability. Mars possesses the closest and most easily accessible layered ice deposits out…
View article: Science Opportunities offered by Mercury’s Ice-Bearing Polar Deposits
Science Opportunities offered by Mercury’s Ice-Bearing Polar Deposits Open
The presence of meters-thick polar deposits exposed directly on the surface of Mercury provides unique science opportunities that should be prioritized in the next decade of planetary exploration.The poles of Mercury provide a natural labo…
View article: The surprising accuracy of isothermal Jeans modelling of self-interacting dark matter density profiles
The surprising accuracy of isothermal Jeans modelling of self-interacting dark matter density profiles Open
Recent claims of observational evidence for self-interacting dark matter (SIDM) have relied on a semi-analytic method for predicting the density profiles of galaxies and galaxy clusters containing SIDM. We present a thorough description of…
View article: Measurement of the Free Neutron Lifetime using the Neutron Spectrometer\n on NASA's Lunar Prospector Mission
Measurement of the Free Neutron Lifetime using the Neutron Spectrometer\n on NASA's Lunar Prospector Mission Open
We use data from the Lunar Prospector Neutron Spectrometer to make the second\nspace-based measurement of the free neutron lifetime finding $\\tau_n=887 \\pm\n14_\\text{stat}{\\:^{+7}_{-3\\:\\text{syst}}}$ s, which is within 1$\\sigma$ of …
View article: The effect of pre-impact spin on the Moon-forming collision
The effect of pre-impact spin on the Moon-forming collision Open
We simulate the hypothesized collision between the proto-Earth and a Mars-sized impactor that created the Moon. Among the resulting debris disc in some impacts, we find a self-gravitating clump of material. It is roughly the mass of the Mo…
View article: The effect of pre-impact spin on the Moon-forming collision
The effect of pre-impact spin on the Moon-forming collision Open
We simulate the hypothesised collision between the proto-Earth and a Mars-sized impactor that created the Moon. Amongst the resulting debris disk in some impacts, we find a self-gravitating clump of material. It is roughly the mass of the …
View article: Atmospheric Erosion by Giant Impacts onto Terrestrial Planets
Atmospheric Erosion by Giant Impacts onto Terrestrial Planets Open
We examine the mechanisms by which the atmosphere can be eroded by giant impacts onto Earth-like planets with thin atmospheres, using 3D smoothed particle hydrodynamics simulations with sufficient resolution to directly model the fate of l…
View article: What does strong gravitational lensing? The mass and redshift distribution of high-magnification lenses
What does strong gravitational lensing? The mass and redshift distribution of high-magnification lenses Open
Many distant objects can only be detected, or become more scientifically valuable, if they have been highly magnified by strong gravitational lensing. We use eagle and bahamas, two recent cosmological hydrodynamical simulations, to predict…
View article: Understanding the large inferred Einstein radii of observed low-mass galaxy clusters
Understanding the large inferred Einstein radii of observed low-mass galaxy clusters Open
We assess a claim that observed galaxy clusters with mass ${\sim}10^{14} \mathrm{\, M_\odot }$ are more centrally concentrated than predicted in lambda cold dark matter (ΛCDM). We generate mock strong gravitational lensing observations, ta…
View article: The Origin of Saturn’s Rings Revisited
The Origin of Saturn’s Rings Revisited Open
<p>A set of key observations over the Cassini spacecraft's tenure has constrained Saturn's rings' age to be less than a few 100 Myr effectively ruling out currently accepted ring origin scenarios, all of which require that the rings …
View article: Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons
Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons Open
We present bahamas-SIDM, the first large-volume, $(400 \, h^{-1} \mathrm{\, Mpc})^{3}$, cosmological simulations including both self-interacting dark matter (SIDM) and baryonic physics. These simulations are important for two primary reaso…
View article: Planetary giant impacts: convergence of high-resolution simulations using efficient spherical initial conditions and swift
Planetary giant impacts: convergence of high-resolution simulations using efficient spherical initial conditions and swift Open
We perform simulations of giant impacts on to the young Uranus using smoothed particle hydrodynamics (SPH) with over 100 million particles. This 100–1000 × improvement in particle number reveals that simulations with below 107 particles fa…
View article: High-Resolution Simulations of Giant Impacts: Efficient Spherical Initial Conditions and Next-Generation Performance with SWIFT
High-Resolution Simulations of Giant Impacts: Efficient Spherical Initial Conditions and Next-Generation Performance with SWIFT Open
We perform simulations of giant impacts onto the young Uranus using smoothed particle hydrodynamics (SPH) with over 100 million particles. This 100--1000$\times$ improvement in resolution passes a key threshold to reveal previously unseen …
View article: Grid Mapping the Northern Plains of Mars: Geomorphological, Radar, and Water‐Equivalent Hydrogen Results From Arcadia Plantia
Grid Mapping the Northern Plains of Mars: Geomorphological, Radar, and Water‐Equivalent Hydrogen Results From Arcadia Plantia Open
A project of mapping ice‐related landforms was undertaken to understand the role of subsurface ice in the northern plains. This work is the first continuous regional mapping from CTX ( ConTeXt Camera , 6 m/pixel; Malin et al., ) imagery in…
View article: Grid Mapping the Northern Plains of Mars: A New Overview of Recent Water‐ and Ice‐Related Landforms in Acidalia Planitia
Grid Mapping the Northern Plains of Mars: A New Overview of Recent Water‐ and Ice‐Related Landforms in Acidalia Planitia Open
We used a grid‐mapping technique to analyze the distribution of 13 water‐ and ice‐related landforms in Acidalia Planitia as part of a joint effort to study the three main basins in the northern lowlands of Mars, that is, Acidalia, Utopia, …
View article: Unravelling the Mystery of Lunar Anomalous Craters Using Radar and Infrared Observations
Unravelling the Mystery of Lunar Anomalous Craters Using Radar and Infrared Observations Open
In Miniature Radio Frequency (Mini‐RF) radar images, anomalous craters are those having a high circular polarization ratio (CPR) in their interior but not exterior to their rims. Previous studies found that most CPR‐anomalous craters conta…