Results 61 to 70 of about 768 (162)

A Solution for the Density Dichotomy Problem of Kuiper Belt Objects with Multispecies Streaming Instability and Pebble Accretion

The Planetary Science Journal
Kuiper Belt objects (KBOs) show an unexpected trend, whereby large bodies have increasingly higher densities, up to five times greater than their smaller counterparts. Current explanations for this trend assume formation at constant composition, with the
Manuel H. Cañas, Wladimir Lyra, Daniel Carrera, Leonardo Krapp, Debanjan Sengupta, Jacob B. Simon, Orkan M. Umurhan, Chao-Chin Yang, Andrew N. Youdin   +8 more
doaj   +1 more source

WATER FRACTIONS IN EXTRASOLAR PLANETESIMALS [PDF]

The Astronomical Journal, 2011
Accepted for publication in the Astronomical Journal, 22 pages, 4 figures, 1 ...
Jura, M., Xu, S.
openaire   +2 more sources

Nondestructive analysis of Bennu samples toward comparative studies with Ryugu samples

Meteoritics &Planetary Science, Volume 61, Issue 1, Page 3-16, January 2026.
Abstract Analyzing primitive extraterrestrial samples from asteroids is key to understanding the evolution of the early solar system. The OSIRIS‐REx mission returned samples from the B‐type asteroid Bennu, providing a valuable opportunity to compare them with the Ryugu samples collected by the Hayabusa2 mission.
Ryota Fukai, Masahiro Nishimura, Koki Yumoto, Yuichiro Cho, Yuta Shimizu, Moe Matsuoka, Eri Tatsumi, Soichiro Furukawa, Ryosuke Sakurai, Toru Yada, Kentaro Hatakeda, Kasumi Yogata, Yuma Enokido, Rui Tahara, Akiko Miyazaki, Seiya Kawasaki, Rei Kanemaru, Seiji Sugita, Shoki Mori, Shumpei Nakahara, Yuta Aikyo, Hideaki Miyamoto, Cedric Pilorget, Damien Loizeau, Laura Nardelli, Rachel Sheppard, Cateline Lantz, Lucie Riu, Jean‐Pierre Bibring, Rosario Brunetto, Tatsuaki Okada, Masanao Abe, Tomohiro Usui   +32 more
wiley   +1 more source

From planetesimals to planets with N-body simulations in the giant-planet formation region

Astronomy & Astrophysics
The cores of wide-orbit giant planets can form via pebble accretion if large planetesimals form in the outer regions of protoplanetary discs at sufficiently early times.
Lorek Sebastian, Lambrechts Michiel
doaj   +1 more source

PLANETARY MIGRATION IN EVOLVING PLANETESIMAL DISKS [PDF]

International Journal of Modern Physics D, 2003
In the current paper, we further improved the model for the migration of planets introduced and extended to time-dependent planetesimal accretion disks by Del Popolo. In the current study, the assumption of Del Popolo, that the surface density in planetesimals is proportional to that of gas, is relaxed. In order to obtain the evolution of planetesimal
Yesilyurt, IS, Ercan, EN, Del Popolo, A
openaire   +4 more sources

Modeling enstatite chondrites: Reduced rocks with a pinch of oxidized material (affected by varying H2O(g)) derived from planetesimals shocked during the epoch of giant–planet migration

Meteoritics &Planetary Science, Volume 61, Issue 1, Page 122-139, January 2026.
Abstract The O‐, N‐, Mo‐, Ru‐, Os‐, Cr‐, Ti‐, Ni‐, Fe‐, Nd‐, Ca‐, Zn‐, Sr‐, and Mg‐isotopic compositions of enstatite chondrites are essentially identical to those of the Earth and Moon. These correspondences suggest enstatite chondrites formed at ≈1 AU as the only known chondrite groups that accreted in the vicinity of a major planet. Bulk Earth has a
Alan E. Rubin
wiley   +1 more source

Origin of Isotopic Diversity among Carbonaceous Chondrites

The Astrophysical Journal Letters, 2023
Carbonaceous chondrites are some of the most primitive meteorites and derive from planetesimals that formed a few million years after the beginning of the solar system.
Jan L. Hellmann, Jonas M. Schneider, Elias Wölfer, Joanna Drążkowska, Christian A. Jansen, Timo Hopp, Christoph Burkhardt, Thorsten Kleine   +7 more
doaj   +1 more source

Understanding Planetesimals

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

Low‐Frequency Raman Spectra of Natural Pyrrhotites: Polarization Dependence for Its Lattice Modes

Journal of Raman Spectroscopy, Volume 56, Issue 12, Page 1529-1536, December 2025.
The present study found low‐wavenumber Raman modes of pyrrhotite Fe1‐xS at ~68, ~87, ~117, and ~230 cm−1 for the first time, thanks to a lab‐built Raman spectrometer, in which the optical path of the incident laser was purged by Ar gas. The sufficiently high signal‐to‐noise and signal‐to‐base ratios enabled us to obtain the polarization dependence of ...
Shu‐hei Urashima, Mana Kito, Shiori Nakajima, Kenichi Oguchi, Aruto Kashima, Hiroharu Yui   +5 more
wiley   +1 more source

Terrestrial Planet Formation from Two Source Reservoirs

The Astronomical Journal
This work describes new dynamical simulations of terrestrial planet formation. The simulations started at the protoplanetary disk stage, when planetesimals formed and accreted into protoplanets, and continued past the late stage of giant impacts.
David Nesvorný, Alessandro Morbidelli, William F. Bottke, Rogerio Deienno, Max Goldberg   +4 more
doaj   +1 more source