Results 51 to 60 of about 244,696 (195)

Survival of Terrestrial Planets in the Presence of Giant Planet Migration

, 2003
The presence of ``Hot Jupiters'', Jovian mass planets with very short orbital periods orbiting nearby main sequence stars, has been proposed to be primarily due to the orbital migration of planets formed in orbits initially much further from the parent ...
Avi M. Mandell, Chambers J. E., Steinn Sigurdsson   +2 more
core   +1 more source

Joint Inversion of Receiver Functions and Apparent Incidence Angles for Sparse Seismic Data

Earth and Space Science, 2021
The estimation of crustal structure and thickness is essential in understanding the formation and evolution of terrestrial planets. Initial planetary missions with seismic instrumentation on board face the additional challenge of dealing with seismic ...
Rakshit Joshi, Brigitte Knapmeyer‐Endrun, Klaus Mosegaard, Heiner Igel, Ulrich R. Christensen   +4 more
doaj   +1 more source

What the Upper Atmospheres of Giant Planets Reveal

Remote Sensing, 2022
The upper atmospheres of the Giant Planets, Jupiter, Saturn, Uranus and Neptune are transition regions between meteorological layers and outer space. As a result of their exceptionally rarefied nature, they are highly sensitive and therefore revealing ...
James O’Donoghue, Tom Stallard
doaj   +1 more source

Elemental ratios in stars vs planets

, 2015
Context. The chemical composition of planets is an important constraint for planet formation and subsequent differentiation. While theoretical studies try to derive the compositions of planets from planet formation models in order to link the composition
Alibert, Yann, Leya, Ingo, Marboeuf, Ulysse, Mezger, Klaus, Thiabaud, Amaury   +4 more
core   +1 more source

Terraforming Mars is not out of the question yet - and microscopic algae could help [PDF]

Trakia Journal of Sciences, 2019
Recently some researchers have gathered around the claim that the likelihood for terraformation of Mars is slim, either because human technology is not up to the task, or the planet does not posses all the necessary resources to allow the process to be ...
Iv. Vasileva, A. Ivanova, S. Alexandrov   +2 more
doaj   +1 more source

Planet formation around stars of various masses: Hot super-Earths

, 2008
We consider trends resulting from two formation mechanisms for short-period super-Earths: planet-planet scattering and migration. We model scenarios where these planets originate near the snow line in ``cold finger'' circumstellar disks.
Grant M. Kennedy, Scott J. Kenyon, Weidenschilling S. J.   +2 more
core   +1 more source

Could we identify hot Ocean-Planets with CoRoT, Kepler and Doppler velocimetry? [PDF]

, 2007
Planets less massive than about 10 MEarth are expected to have no massive H-He atmosphere and a cometary composition (50% rocks, 50% water, by mass) provided they formed beyond the snowline of protoplanetary disks.
A. Léger, Alibert, Alonso, B. Chazelas, Baraffe, Baraffe, Barman, Bordé, Bouchy, C. Moutou, C. Sotin, Chassefiére, Cox, D. Despois, D. Ehrenreich, D. Mawet, Di Benedetto, Ehrenreich, F. Bouchy, F. Brachet, F. Selsis, Fortney, Grießmeier, Grießmeier, H. Lammer, J.-M. Grießmeier, J.F. Kasting, Kasting, Kervella, Khodachenko, Kuchner, Lammer, Lovis, Léger, Léger, M. Decaudin, M. Deleuil, M. Ollivier, Mayor, Moutou, O'Donovan, O. Grasset, P. Barge, P. Bordé, Pepe, Press, Protanov, Rafikov, Raymond, Raymond, Raymond, Ribas, Rouan, Santos, Sato, Terada, Tian, Valencia, Vidal-Madjar, Vidal-Madjar, Watson, Wood, Wood, Yelle   +63 more
core   +5 more sources

Mean Motion Resonances from Planet-Planet Scattering [PDF]

The Astrophysical Journal, 2008
Planet-planet scattering is the leading mechanism to explain the large eccentricities of the observed exoplanet population. However, scattering has not been considered important to the production of pairs of planets in mean motion resonances (MMRs). We present results from a large number of numerical simulations of dynamical instabilities in 3-planet ...
Raymond, Sean N., Barnes, Rory, Armitage, Philip J., Gorelick, Noel   +3 more
openaire   +2 more sources

Thermal modeling of subduction zones with prescribed and evolving 2D and 3D slab geometries

Progress in Earth and Planetary Science
The determination of the temperature in and above the slab in subduction zones, using models where the top of the slab is precisely known, is important to test hypotheses regarding the causes of arc volcanism and intermediate-depth seismicity.
Nathan Sime, Cian R. Wilson, Peter E. van Keken   +2 more
doaj   +1 more source

Minimum Radii of Super-Earths: Constraints from Giant Impacts

, 2010
The detailed interior structure models of super-Earth planets show that there is degeneracy in the possible bulk compositions of a super-Earth at a given mass and radius, determined via radial velocity and transit measurements, respectively. In addition,
Adams, Agnor, Borucki, Fortney, Grasset, Ida, Marcus, Masset, Melnick, Petaev, Sasselov, Stewart, Valencia   +12 more
core   +1 more source