Antarctic meteorites and the origin of planetesimals and protoplanets
نویسنده
چکیده
Almost all meteorites (about 99% by number) are samples from a few hundreds of asteroids that are leftover from planetesimals and protoplanets formed within several million years after the birth of the Solar System. These meteorites record detailed evolutionary history of dust to planets, including condensation, accretion, aqueous alteration, thermal metamorphism, partial and total melting.
منابع مشابه
Meteorite Constraints on the Early Stages of Planetary Growth in the Inner Solar System
We present the results of a study of the delivery of the parent bodies of iron meteorites to the inner part of the asteroid belt through collision, accretion, and scattering of planetesimals, and the subsequent growth of chondritic asteroids at the early stage of planet growth. Our goal is to portray a comprehensive picture of the growth and scattering of meteorite parent bodies in the inner pa...
متن کاملIron Meteorites as Remnants of Planetesials Formed in the Terrestrial Planet
Iron meteorites are core fragments from disrupted and differentiated planetesimals [1]. Their formation location is usually assumed to be the main asteroid belt. Observational evidence, however, does not indicate that differentiated bodies or their fragments were ever common there [2]. This view is also difficult to reconcile with the fact that their parent bodies were as small as 20 km in diam...
متن کاملPlanetesimal Accretion onto Growing Proto-Gas-Giant Planets
The solar and extra solar gas giants appear to have diverse internal structure and metallicities. We examine a potential cause for these dispersions in the context of the conventional sequential accretion formation scenario, which assumes the initial formation of cores from protoplanetary embryos. In principle, gas accretion onto cores with masses below several times that of the Earth is suppre...
متن کاملOligarchic Growth of Protoplanets
and N-body calculations (e.g., Ida 1990, Ida and Makino 1992b). It is shown that dynamical friction is effective in We investigate the growth and the orbital evolution of proa Keplerian potential as well as in a free space. Kokubo toplanets embedded in a swarm of planetesimals using threedimensional N-body simulations. We find that among protoplaand Ida (1996), hereafter referred to as Paper I,...
متن کاملThe Chronology of Accretion and Volatile Depletion of Differentiated Protoplanets Inferred from Rb-sr Systematics of Angrites
Introduction: Many meteorite parent bodies as well as the terrestrial planets are characterized by a depletion in moderately volatile elements compared to CI chondrites and the solar nebula. Determining the timing of this depletion is key for constraining the nature of the depletion process and such time constraints can be obtained from the Rb-Sr systematics of meteorites and some of their comp...
متن کامل