Results 41 to 50 of about 227,798 (298)

A perspective from extinct radionuclides on a Young Stellar Object: The Sun and its accretion disk

open access: yes, 2011
Meteorites, which are remnants of solar system formation, provide a direct glimpse into the dynamics and evolution of a young stellar object (YSO), namely our Sun.
Christophe Michel-Lévy M   +20 more
core   +1 more source

Stability and Formation of the Resonant System HD 73526 [PDF]

open access: yes, 2007
Based on radial velocity measurements it has been found recently that the two giant planets detected around the star HD 73526 are in 2:1 resonance. However, as our numerical integration shows, the derived orbital data for this system result in chaotic ...
Beaugé   +26 more
core   +2 more sources

Microstructure Design of Steel‐Spinel Composites via Spark Plasma Sintering Process

open access: yesAdvanced Engineering Materials, EarlyView.
This study illustrates how spark plasma sintering at reduced oxygen partial pressure enables controlled formation of steel‐spinel composites through tailored redox reactions and cation exchange. Comparison of the MgO–Fe2O3, steel–(MgO+Cr2O3), and steel–(MgO+Fe2O3) systems shows how oxygen activity and interface chemistry govern spinel formation, phase ...
Mahnaz Mehdizadehlima   +4 more
wiley   +1 more source

The Dependence of the Structure of Planet-opened Gaps in Protoplanetary Disks on Radiative Cooling

open access: yesThe Astrophysical Journal
Planets can excite density waves and open annular gas gaps in protoplanetary disks. The depth of gaps is influenced by the evolving angular momentum carried by density waves.
Minghao Zhang   +2 more
doaj   +1 more source

Dynamical Interactions and Mass Loss within the Uranian System

open access: yesThe Planetary Science Journal, 2023
The origin and evolution of planetary rings and moons remains an active area of study, particularly as they relate to the impact history and volatile inventory of the outer solar system.
Stephen R. Kane, Zhexing Li
doaj   +1 more source

Formation of Protoplanets from Massive Planetesimals in Binary Systems

open access: yes, 2007
More than half of stars reside in binary or multiple star systems and many planets have been found in binary systems. From theoretical point of view, however, whether or not the planetary formation proceeds in a binary system is a very complex problem ...
Fukushige T.   +8 more
core   +1 more source

Production of MgO/TiC Composites From MgO‐C Recyclates Using Spark Plasma Sintering

open access: yesAdvanced Engineering Materials, EarlyView.
Using the spark plasma sintering technique, MgO/TiC composites are manufactured from recycled MgO‐C refractories stemming from the steel production that were mixed with titanium powder. This article shows, how the size of the Ti grains and their distribution in the powder mixture affect the local carbon concentration in TiC.
Jiayan Yu   +3 more
wiley   +1 more source

Testing the Icy Pebble Accretion Hypothesis with Primordial Main-belt Asteroids

open access: yesThe Astrophysical Journal
Large main-belt asteroids (diameter D  ≳ 120 km) exhibit a surface composition gradient as a function of heliocentric distance, ranging from anhydrous bodies to those rich in hydrated and, possibly, ammoniated materials. Their primordial nature holds key
Jinfei Yu   +2 more
doaj   +1 more source

Entrapment of Hypervolatiles in Interstellar and Cometary H2O and CO2 Ice Analogs

open access: yesThe Astrophysical Journal, 2023
Planets and planetesimals acquire their volatiles through ice and gas accretion in protoplanetary disks. In these disks, the division of volatile molecules between the condensed and gaseous phases determines the quantity of volatiles accreted by planets ...
Alexia Simon   +2 more
doaj   +1 more source

Making the Earth: Combining Dynamics and Chemistry in the Solar System

open access: yes, 2009
No terrestrial planet formation simulation completed to date has considered the detailed chemical composition of the planets produced. While many have considered possible water contents and late veneer compositions, none have examined the bulk elemental ...
Abe   +72 more
core   +1 more source

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