Results 101 to 110 of about 4,639 (216)
Comet 67P/Churyumov-Gerasimenko preserved the pebbles that formed planetesimals [PDF]
, 2016 Solar system formation models predict that the building blocks of planetesimals were mm- to cm-sized pebbles, aggregates of ices and non-volatile materials, consistent with the compact particles ejected by comet 67P/Churyumov-Gerasimenko (67P hereafter ...
Mazzotta Epifani, E. +58 more
core +1 more source
Magnetic Field Evolution in Terrestrial Bodies from Planetesimals to Exoplanets
, 2019 Space missions have shown that most terrestrial bodies have an internally generated magnetic field in their metallic core and/or a crustal field due to remanent magnetism. The latter indicates the presence of an old dynamo at the time of crust formation.
Breuer, Doris
core +1 more source
Eos, Transactions American Geophysical Union, 2014 Planetesimals represent turning points in planetary formation, when the materials required for building planets are first incorporated into bodies with radii from tens to hundreds of kilometers or larger, and are sometimes differentiated into metallic cores and silicate mantles. These early celestial bodies are the accretionary step between the dust of
openaire +1 more source
Pebbles versus planetesimals: the case of Trappist-1 [PDF]
, 2019 We present a study into the formation of planetary systems around low mass stars similar to Trappist-1, through the accretion of either planetesimals or pebbles. The aim is to determine if the currently observed systems around low mass stars could favour
Coleman, G. A. L. +7 more
core +1 more source
The Multifaceted Planetesimal Formation Process [PDF]
, 2014 Accumulation of dust and ice particles into planetesimals is an important step in the planet formation process. Planetesimals are the seeds of both terrestrial planets and the solid cores of gas and ice giants forming by core accretion. Left-over planetesimals in the form of asteroids, trans-Neptunian objects and comets provide a unique record of the ...
Johansen, Anders +5 more
openaire +3 more sources
Fractionation of noble gases by thermal escape from accreting planetesimals [PDF]
, 1986 A model for the selective loss of noble gases by thermal escape of the gases from planetesimals as they grow to form the terrestrial planets has been developed. The initial elemental and isotopic abundance ratios are assumed to be solar.
Donahue, Thomas M.
core +1 more source
Planetesimal Disk Evolution Driven by Embryo-Planetesimal Gravitational Scattering
The Astronomical Journal, 2003 40 pages, 9 figures, submitted to ...
openaire +2 more sources
Tidal Disruption of Planetesimals from an Eccentric Debris Disk Following a White Dwarf Natal Kick
The Astrophysical Journal LettersThe surfaces of many white dwarfs are polluted by metals, implying a recent accretion event. The tidal disruption of planetesimals is a viable source of white dwarf pollution and offers a unique window into the composition of exoplanet systems.
Tatsuya Akiba +2 more
doaj +1 more source
Effects of stellar X-ray photoevaporation on planetesimal formation via the streaming instability
Astronomy & AstrophysicsContext. The formation of planetesimals via the streaming instability (SI) is a crucial step in planet formation, yet its triggering conditions and efficiency are highly sensitive to both disk properties and specific evolutionary processes. Aims.
Ying Xuchu +9 more
doaj +1 more source
PLANETESIMAL FORMATION INDUCED BY SINTERING [PDF]
The Astrophysical Journal, 2011 Sintering of H2O ice proceeds in an icy dust aggregate as the temperature increases due to the infall to the central star. By numerical simulations, I show that fragmentation of the aggregate by sintering occurs at a particular region of a protoplanetary nebula. The fragments accumulate at the region because their infalling velocity is low.
openaire +1 more source