Showing papers in "Icarus in 2009"

TL;DR: An asteroid taxonomy classification system based on reflectance spectrum characteristics for 371 asteroids measured over the wavelength range 0.45 to 2.45 μm is presented and nearly all of the Bus taxonomy classes are preserved, with one new class (Sv).

TL;DR: In this paper, the size frequency distribution (SFD) of the initial planetesimals is considered a free parameter in these simulations, and search for the one that produces at the end objects with a SFD that is consistent with Asteroid belt constraints.

TL;DR: The Asteroid Lightcurve Database (LCDB) as mentioned in this paper is a central database for asteroid lightcurve data, i.e., rotation rate and amplitude along with ancillary information such as diameter and albedo, taxonomic class, etc.

TL;DR: In this paper, the authors present results of 40 high-resolution dynamical simulations of late-stage planetary accretion with the goal of reproducing these constraints, although neglecting the planet Mercury.

TL;DR: In this paper, the authors model the growth of Jupiter via core nucleated accretion, applying constraints from hydrodynamical processes that result from the disk-planet interaction, and compute the planet's internal structure using a well tested planetary formation code that is based upon a Henyey-type stellar evolution code.

TL;DR: The model for Titan by Krasnopolsky (2014, Icarus 236, 83-91) has been adjusted to Pluto's conditions during the New Horizons flyby as discussed by the authors.

TL;DR: In this paper, the authors presented an in-depth study of the distributions of various neutral species in Titan's upper atmosphere, between 950 and 1500 km for abundant species (N2, CH4, H2) and between 1000 and 1200 km for other minor species.

TL;DR: In this article, the authors used the LMD (Laboratoire de Meteorologie Dynamique) Mars GCM (General Circulation Model) to predict past deposition of ice consistent with geological observations in many cases.

TL;DR: In this article, a global investigation based on high-resolution image data gathered by the High-Resolution Stereo Camera (HRSC) during the first years of Mars Express orbiting around Mars is presented.

TL;DR: In this article, the authors investigated the stability of 1 M ⊕ (Earth-mass) bodies orbiting a Sun-like star for virtual times reaching 10 billion years and found that, for a given class of system (e.g., three 1 M Š� planets), orbit crossing times vary with planetary spacing approximately as a power law over a wide range of separation in semimajor axis.

TL;DR: In this paper, the authors developed iSALE-3D, a three-dimensional multi-rheology hydrocode, which is efficient enough to perform a large number of well-resolved oblique impact simulations within a reasonable time.

TL;DR: In this article, the authors used infrared images obtained by the Thermal Emission Imaging System (THEMIS) instrument on-board Mars Odyssey to retrieve the optical depth of dust and water ice aerosols over more than 3.5 martian years between February 2002 and December 2008.

TL;DR: The global distribution of PH3 on Jupiter and Saturn is derived using 2.5 cm−1 spectral resolution Cassini/CIRS observations in this article, which suggest striking similarities between the tropospheric dynamics in the 100-1000 mbar regions of the giant planets: both demonstrate enhanced PH3 at the equator, depletion over neighbouring equatorial belts and mid-latitude belt/zone structures.

TL;DR: In this paper, the authors analyzed a unique, three-dimensional data set of Uranus acquired with the STIS Hubble spectrograph on August 19, 2002, covering a full afternoon hemisphere at 300 and 1000 nm wavelength at 1 nm resolution.

TL;DR: In this paper, a line-by-line approach was used to evaluate the reliability of the retrieved quantities, which showed no hemispherical asymmetries or latitudinal variability.

TL;DR: In this paper, a new hybrid hydrocode to N-body code computational technique was proposed to estimate the shear strength of the target for 2 to 50-km radius Kuiper belt collisions.

TL;DR: In this paper, the presence of an ovoid-shaped landform, approximately 3 by 5 km in size, within the layered terrains surrounding the Mawrth Vallis outflow channel.

TL;DR: In this paper, an anelastic general circulation model is proposed to drive the system away from an isentropic and therefore barotropic state, and the model's geometry is a full 3D sphere down to a small inner core.

TL;DR: In this article, high and low solar activity models of the martian thermosphere/ionosphere for a solar zenith angle of 60° were constructed for both eroded and non-eroded ionospheric models.

TL;DR: In this article, the authors calculate the solid surface density of a possible giant planet-forming solar nebula as a function of heliocentric distance and time, and find three effects that favor giant planet formation by the core accretion mechanism: (1) a decretion flow that brings mass from the inner solar nebulation to the giant planet forming region, (2) the fact that the ammonia and water ice lines should coincide, according to recent lab results from Collings et al., and (3) the presence of a substantial amount of methane ice in the trans-sat

TL;DR: In this paper, thermal observations of thermal emission from fifteen transneptunian objects (TNOs) made using the Spitzer Space Telescope were used to determine the sizes and albedos of these objects.

TL;DR: In this paper, a survey of spectroscopic observations of comets extending for roughly 19 years from 1985 to 2004 comprising data for 92 comets of which 50 showed good emissions, including the odd Comets Yanaka (1988r), 43P/Wolf-Harrington and 19P/Borrelly.

TL;DR: In this article, a set of base objects representative of the near-Earth object population are added to the simulation data and the expected relative errors in the spin and obliquity components of the YORP torque caused by the observationally unresolved small-scale topography are computed.

TL;DR: The South Pole-Aitken basin (SP-A) as discussed by the authors is the largest and oldest basin on the Moon and the topography, abundances of iron, thorium, and the distribution of mare basalts are all elevated in the northern half of the ellipses.

TL;DR: In this paper, the authors constrain the volcanic history of this region, and to determine the chronological relationships with fluvial/erosional processes, and find that some volcanic features are extremely recent (∼2

TL;DR: In this article, the authors consider a compressible model of convection in a spherical shell with rapid rotation, using the anelastic approximation, to explore the parameter range for which such zonal flows can be produced.

TL;DR: In this article, the authors examine the shape of a "rubble pile" asteroid as it slowly gains angular momentum by YORP torque, to the point where "landsliding" occurs.

TL;DR: The first comprehensive calibration and mapping of the thermal microwave emission from Titan's surface is reported based on radiometric data obtained at 2.2-cm wavelength by the passive radiometer included in the Cassini Radar instrument as discussed by the authors.

TL;DR: In this paper, annealing of amorphous water ice is proposed as the driver of activity in comets as they first enter the inner Solar System, and large grains can be ejected at low velocity during anneal and the rate of brightening should decrease as the heliocentric distance decreases.

TL;DR: In this paper, both outward and inward transport of solids are investigated in the context of a two-dimensional, viscously evolving protoplanetary disk, and it is shown that high velocity, inward flows along the disk surface aid in the rapid transport from the outer disk to the inner disk, particularly for small dust.