Results 71 to 80 of about 15,247 (235)
Planetesimal-driven planet migration in the presence of a gas disk
, 2010 We report here on an extension of a previous study by Kirsh et al. (2009) of planetesimal-driven migration using our N-body code SyMBA (Duncan et al., 1998). The previous work focused on the case of a single planet of mass Mem, immersed in a planetesimal
Adachi +38 more
core +1 more source
Fast Radio Bursts and Interstellar Objects
The Astrophysical JournalFast radio bursts (FRBs) are transient radio events with millisecond-scale durations and debated origins. Collisions between planetesimals and neutron stars (NSs) have been proposed as a mechanism to produce FRBs; the planetesimal strength, size, and ...
Dang Pham +4 more
doaj +1 more source
Estimating the mass of the debris disc in HD 69830
, 2011 We present a method to estimate the mass of the debris disc in the HD 69830 system, which also hosts three exoplanets with Neptune-like minimum masses. By considering the range of published stellar ages, we interpret the infrared emission from the debris
Alibert +16 more
core +1 more source
Origin of the CC-NC isotopic dichotomy in early planetesimals (iron meteorite parent bodies) [PDF]
, 2022 Alessandro Morbidelli +6 more
openalex +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 +5 more
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 +7 more
doaj +1 more source
Metallicity of the Massive Protoplanets Around HR 8799 If Formed by Gravitational Instability
, 2009 The final composition of giant planets formed as a result of gravitational instability in the disk gas depends on their ability to capture solid material (planetesimals) during their 'pre-collapse' stage, when they are extended and cold, and contracting ...
Alexander +35 more
core +1 more source
TWO BEYOND-PRIMITIVE EXTRASOLAR PLANETESIMALS [PDF]
The Astrophysical Journal, 2013 Using the Cosmic Origins Spectrograph onboard the Hubble Space Telescope, we have obtained high-resolution ultraviolet observations of GD 362 and PG 1225-079, two helium-dominated, externally-polluted white dwarfs. We determined or placed useful upper limits on the abundances of two key volatile elements, carbon and sulfur, in both stars; we also ...
Xu, S. +4 more
openaire +2 more sources
Satellites and Small Bodies With ALMA: Insights Into Solar System Formation and Evolution
AGU Advances, Volume 6, Issue 6, December 2025.Abstract Our understanding of the formation and evolution of planetary systems has made major advances in the past decade. This progress has been driven in large part by the Atacama Large Millimeter/submillimeter Array (ALMA), which has given us an unprecedented view of solar system bodies themselves, and of the structure and chemistry of forming ...
Katherine de Kleer +3 more
wiley +1 more source
The Planetary Science JournalKuiper 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 +8 more
doaj +1 more source