The present-day solar system comprises meteorites with varying oxidation levels, derived from different parent bodies.
planetary embryos
Posted inAstrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Meteorites & Asteroids, Press Release
Iron Isotope Anomalies And The Origin Of The Earth
Understanding the origin of the Earth requires determining the original formation location of its building material.
Posted inIce Giant, Icy Worlds, Neptune, Status Report, Triton, Water/Hycean Worlds & Oceanography
Neptune’s Obliquity Was Likely Engendered By Triton’s Tidal Evolution
Neptune’s present axial tilt of approximately 28 deg. with respect to its orbital plane can be explained by collisions that its primordial core may have experienced with surrounding planetary embryos […]
Posted inAstrogeology, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Status Report
Long-Term Evolution of Close-in Sub-Neptunes and Outer Planetary Embryos: Atmospheric Mass Loss and Origin of Planets Inside and Outside the Radius Gap
As a byproduct of sub-Neptune formation, planetary embryos with high eccentricity can remain in outer orbits, near 1 au from the star. In this work, we investigate the long-term evolution […]
Posted inAstrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Comets and Asteroids, Exoplanets, -moons, -comets, Status Report
Constructing Earth Formation History Using Deep Mantle Noble Gas Reservoirs
Noble gases are powerful probes of the Earth’s early history, as they are chemically inert. Neon isotopic ratios in deep mantle plumes suggest that nebular gases were incorporated into the […]
Posted inAstrogeology, Exoplanets, -moons, -comets, Status Report
Formation And Disruption Of Resonant Chains Of Super-Earths: Secular Perturbations From Outer Eccentric Embryos
Recent observations have revealed the distribution of orbital period ratios of adjacent planets in multiple super-Earth systems and how these distributions change with time.
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Extinction events, Gaia - Planetary Perspectives, Habitable Zones, Impact events, Status Report
Re-accretion of Giant Impact Ejecta Can Drive Significant Atmospheric Erosion on Terrestrial Planets
Giant impacts, the collisions between planetary embryos, play a crucial role in sculpting the planets and their orbital architectures.
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Extinction events, Impact events, Mars, Mercury, Moon, Status Report, Venus
Dynamical Origin Of Theia, The Last Giant Impactor On Earth
Cosmochemical studies have proposed that Earth accreted roughly 5-10% of its mass from carbonaceous (CC) material, with a large fraction delivered late via its final impactor, Theia (the Moon-forming impactor). […]
Posted inAstrochemistry, Astrogeology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Icy Worlds, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography
Dust-driven Vortex Cascades Originating At Water Snow Region: A Pathway To Planetesimal Formation
The origin of observed planetary systems, including our solar system, as well as their diversity is still an open question.
Posted inAstrogeology, Exoplanets, -moons, -comets, Status Report, TRAPPIST-1
Forming Earth-like and Low-Mass Rocky Exoplanets Through Pebble and Planetesimal Accretion
The theory of pebble accretion (PA) has become a popular planet formation theory during the past decade. However, PA studies generally rely on large planetary embryos, much larger than those […]