Share This Author
A low mass for Mars from Jupiter’s early gas-driven migration
Simulation of the early Solar System shows how the inward migration of Jupiter to 1.5 au, and its subsequent outward migration, lead to a planetesimal disk truncated at 1’au; the terrestrial planets then form from this disk over the next 30–50 million years, with an Earth/Mars mass ratio consistent with observations.
Seismic Triggering of Eruptions in the Far Field : Volcanoes and Geysers
Approximately 0.4% of explosive volcanic eruptions occur within a few days of large, distant earthquakes. This many “triggered” eruptions is much greater than expected by chance. Several mechanisms…
Building Terrestrial Planets
This article reviews our current understanding of terrestrial planet formation. The focus is on computer simulations of the dynamical aspects of the accretion process. Throughout the review, we…
Rotational breakup as the origin of small binary asteroids
It is found that mass shed from the equator of a critically spinning body accretes into a satellite if the material is collisionally dissipative and the primary maintains a low equatorial elongation.
THE LINK BETWEEN PLANETARY SYSTEMS, DUSTY WHITE DWARFS, AND METAL-POLLUTED WHITE DWARFS
It has long been suspected that metal-polluted white dwarfs (types DAZ, DBZ, and DZ) and white dwarfs with dusty disks possess planetary systems, but a specific physical mechanism by which…
The Compositional Structure of the Asteroid Belt
The past decade has brought major improvements in large-scale asteroid discovery and characterization with over half a million known asteroids and over 100,000 with some measurement of physical…
The Unexpected Surface of Asteroid (101955) Bennu
Early OSIRIS-REx observations of Bennu are considered to understand how the asteroid’s properties compare to pre-encounter expectations and to assess the prospects for sample return.
Highly siderophile elements in Earth’s mantle as a clock for the Moon-forming impact
- Seth Andrew Jacobson, A. Morbidelli, S. Raymond, D. O'Brien, K. Walsh, D. Rubie
- Geology, PhysicsNature
- 3 April 2014
A large number of N-body simulations are used to demonstrate a relationship between the time of the last giant impact on an Earth-like planet and the amount of mass subsequently added during the era known as Late Accretion, and the concentration of highly siderophile elements in Earth’s mantle constrains the mass of chondritic material added to Earth during LateAccretion.
Growing the terrestrial planets from the gradual accumulation of submeter-sized objects
- H. Levison, K. Kretke, K. Walsh, W. Bottke
- Physics, GeologyProceedings of the National Academy of Sciences
- 7 October 2015
It is shown that a new mode of planet formation known as “Viscous Stirred Pebble Accretion,” which has recently been shown to produce the giant planets, also naturally explains the small size of Mars and the low mass of the asteroid belt, and there is a unified model that can be used to explain all of the basic properties of the authors' solar system.
OSIRIS-REx: Sample Return from Asteroid (101955) Bennu
In May of 2011, NASA selected the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) asteroid sample return mission as the third mission in the New…