Showing papers in "Icarus in 2014"

TL;DR: The OSIRIS-REx asteroid sample return mission target, (101955) Bennu (formerly 1999 RQ 36), is a half-kilometer near-Earth asteroid with an extraordinarily well constrained orbit as mentioned in this paper.

TL;DR: In this paper, a new model for terrestrial planet formation has explored accretion in a truncated protoplanetary disk, and found that such a configuration is able to reproduce the distribution of mass among the planets in the Solar System, especially the Earth/Mars mass ratio, which earlier simulations have generally not been able to match.

TL;DR: A new approach to the asteroid family classification by combining the Hierarchical Clustering Method (HCM) with a method to add new members to existing families, which allows to solve some difficult cases of families overlapping in the proper elements space but generated by different collisional events.

TL;DR: In this article, ion chromatographic (IC) and isotopic analyses of a unique sawdust portion of the martian meteorite EETA79001 that show the presence by mass of 0.6 ± 0.1% ClO 4 -, ClO 3 -, and NO 3 - were performed.

TL;DR: Gressel et al. as mentioned in this paper examined the gas circulation near a gap opened by a giant planet in a protoplanetary disk and showed with high resolution 3D simulations that the gas flows into the gap at high altitude over the midplane, at a rate dependent on viscosity.

TL;DR: In this paper, the authors present laboratory NIR spectra of a wide range of common Fe-bearing minerals (e.g., olivines, pyroxenes), glasses, and mineral/glass mixtures.

TL;DR: In this article, the level of agreement among experts depends on crater diameter, number of craters per diameter bin, and terrain type, with differences of up to ∼±45%.

TL;DR: In 2008 the Phoenix Mars lander Wet Chemistry Laboratory (WCL) measured 0.6% of perchlorate (ClO 4 - ) in the martian soil as discussed by the authors.

TL;DR: In this paper, infrared transmission spectra (2-25μm range, 5000-400 cm−1) of 40 carbonaceous chondrites were analyzed (21 CMs, 5 CVs, 6 CRs, 3 CKs, 4 C2s and 2 CIs) for comparison with emission spectra of fine-grained asteroid surfaces and dust-rich cometary tails.

TL;DR: In this article, the authors adopt an approach employed in terrestrial ocean modeling, where a significant portion of tidal dissipation arises due to bottom drag, with the drag coefficient O (0.001) being relatively well-established.

TL;DR: In this paper, the authors present analysis of thermal infrared photometry and spectroscopy that test the hypotheses that Bennu is carbonaceous and that its surface is covered in fine-grained (sub-cm) regolith.

TL;DR: The spectral maps of the inner ∼ 10 km of the coma collected 7min and 23min after closest approach of Hartley 2 were obtained in the 1.05-4.83μm wavelength range using the HRI-IR spectrometer.

TL;DR: In this article, a 1-D photochemical model was used to calculate the deposition rates of sulfate, nitrogen oxyanions, and perchlorate from Mars' atmosphere, given a plausible range of volcanic fluxes of sulfur- and chlorine-containing gases in the past.

TL;DR: Brown et al. as mentioned in this paper used CCD photometric techniques to estimate the luminous energy, kinetic energy, and mass of the impactors and found that the flux to a limiting energy of 2.5 × 10−6kT TNT or 1.05 × 107kT was 1.03 × 10 −7k−2h−1.

TL;DR: In this article, interior structure models of Saturn were constructed, and the corresponding mode frequencies were compared with the observed mode frequencies, confirming that these waves are indeed excited by Saturn's f-modes.

TL;DR: The Vesta gravity field and related physical parameters have been precisely measured using 10-months of radiometric Doppler and range data and optical landmark tracking from the Dawn spacecraft as discussed by the authors.

TL;DR: In this paper, the authors used the theory of asteroid nutational damping by Breiter et al. and found that slowly tumbling asteroids predominate in the spin rate-size range where their estimated damping times are greater than about 0.2 Gyr.

TL;DR: In this paper, the authors investigate the magnitude of supercooling and its variation with salt composition and concentration, and investigate slow cooling and warming experiments on pure salt solutions and saturated soil-solutions.

TL;DR: In this article, the photochemical model of Titan is compared with the observations of Titan's atmosphere and ionosphere, and the model reproduces the basic observational data and adequately describes basic chemical processes.

TL;DR: In this article, the authors used the model by Skorov and Blum, who assumed that cometesimals formed by gravitational instability of a cloud of dust and ice aggregates and calculated for the corresponding structure of the dust-aggregate layers on the order of 1.

TL;DR: In this article, a Raman microscope equipped with an environmental cell was used to simulate Mars relevant temperature and relative humidity conditions and monitor deliquescence (solid to aqueous) and efflorescence (aqueous to solid) phase transitions of Ca(ClO4)2.

TL;DR: In this paper, the mineralogy and physical properties of Chelyabinsk meteorites are presented, and three types of meteorite material are present, described as the light-colored, dark-colored and impact-melt lithologies.

TL;DR: In this paper, the authors investigated numerically the momentum transferred by impacts of small (artificial) projectiles on asteroids and found that porosity and strength can have a large effect on the amount of transferred momentum and on the scaling of the momentum with impact velocity.

TL;DR: In this paper, the authors show that the initial disk of the Moon formed from a partially vaporized disk generated by a collision between the proto-Earth and a Mars-sized impactor, and they show the extent to which the properties of the disk can be inferred from smoothed Particle Hydrodynamic (SPH) simulations.

TL;DR: The reference state model is taken from French et al. as discussed by the authors, who used density functional theory to compute the equation of state and the electrical conductivity in Jupiter's interior, and found that strong differential rotation in the dynamo region tends to destroy a dominant dipolar component, but when the convection is sufficiently supercritical it generates a strong magnetic field, and the differential rotation is suppressed by the Lorentz force.

TL;DR: The maximum Na/Si abundance ratio of 0.20 −0.03 by weight (∼5 ¼wt% Na) is observed at high northern latitudes and is significantly larger than the equatorial N/Si ratio of 1.11−0.01 by weight as mentioned in this paper.

TL;DR: The Geologic Mapping of Vesta Special Issue/Section of Icarus as mentioned in this paper includes several papers containing geologic maps of the Vesta surface made to support data analysis conducted by the Dawn Science Team during Vesta Encounter (July 2011-September 2012).

TL;DR: In this paper, reflected light spectral observations in the visible region (0.4-0.94μm) of 80 asteroids belonging to the primitive classes C (prevalently), G, F, B and P, following the Tholen (Tholen, D.J.).

TL;DR: Moreno et al. as discussed by the authors improved the photochemistry of oxygen and introduced a coupling between hydrocarbon, oxygen and nitrogen chemistries, and showed that some oxygen compound abundances are sensitive to the nature of oxygen atoms and the source of the flux.

TL;DR: The MESSENGER spacecraft's surface composition spectrometer (MASCS) obtained more than 1.6 million reflectance spectra of Mercury's surface from near-ultraviolet to near-infrared wavelengths during the first year of orbital operations as discussed by the authors.