Results 1 to 10 of about 4,544 (213)

Massive Debris Disks May Hinder Secular Stirring by Planetary Companions: An Analytic Proof of Concept

The Astrophysical Journal
Debris disks or exo-Kuiper belts, detected through their thermal or scattered emission from their dusty components, are ubiquitous around main-sequence stars.
Antranik A. Sefilian
doaj   +1 more source

Oligarchic Growth of Protoplanets in Planetesimal Rings

The Astrophysical Journal
In the standard planet formation scenario, planetesimals are assumed to form throughout the protoplanetary disk and to be smoothly distributed in the radial direction except for the snowline.
Yuki Kambara, Eiichiro Kokubo
doaj   +1 more source

Silica-rich volcanism in the early solar system dated at 4.565 Ga

Nature Communications, 2018
Achondritic meteorites can record volcanism and crust formation on planetesimals in the early Solar System. Here, the authors date the Northwest Africa 11119 meteorite with an Al-Mg age of 4564.8 ± 0.3 Ma indicating that this is the earliest evidence of ...
Poorna Srinivasan, Daniel R. Dunlap, Carl B. Agee, Meenakshi Wadhwa, Daniel Coleff, Karen Ziegler, Ryan Zeigler, Francis M. McCubbin   +7 more
doaj   +1 more source

Turbulence Inhibits Planetesimal Formation in Class 0/I Disks Subject to Infall

The Astrophysical Journal
There is growing evidence that planet formation begins early, within the ≲1 Myr Class 0/I phase, when infall dominates disk dynamics. Our goal is to determine if Class 0/I disks reach the conditions needed to form planetesimals (∼100 km planet building ...
Daniel Carrera, Abigail Davenport, Jacob B. Simon, Hans Baehr, Til Birnstiel, Cassandra Hall, David Rea, Sebastian Markus Stammler   +7 more
doaj   +1 more source

Origins of Mercury’s Big Heart of Iron: Exploring Pathways to Form High Core Mass Fraction Planets via N-body Simulations

The Astrophysical Journal
Mercury’s core mass fraction (CMF) is 0.7, more than double that of the other rocky planets in the solar system, which have CMFs of 0.3 or lower. The origin of Mercury’s large, iron-rich core remains unknown. Adding to this mystery, an elusive population
Haniyeh Tajer, Ji Wang, Anna C. Childs, Noah Ferich, Tiger Lu, Hanno Rein   +5 more
doaj   +1 more source

Argon in β Pictoris–Entrapment and Release of Volatile in Disks

The Astrophysical Journal
Chemical compositions of planets reveal much about their formation environments. Such information is well sought-after in studies of solar system bodies and extrasolar ones.
Yanqin Wu, Kadin Worthen, Alexis Brandeker, Christine Chen   +3 more
doaj   +1 more source

Early Solar System Turbulence Constrained by High Oxidation States in the Oldest Noncarbonaceous Planetesimals

The Planetary Science Journal
Early solar system (SS) planetesimals constitute the parent bodies of most meteorites investigated today. Nucleosynthetic isotope anomalies of bulk meteorites have revealed a dichotomy between noncarbonaceous (NC) and carbonaceous (CC) groups ...
Teng Ee Yap, Konstantin Batygin, François L. H. Tissot   +2 more
doaj   +1 more source

Shaken, not stirred: Inefficient mixing of CM- and CI-like materials

Astronomy & Astrophysics
Context. A recent study suggests that CM chondrite-like planetesimals formed in the vicinity of Saturn, in a pressure bump outside the gap carved by proto-Jupiter. While a fraction of these objects was implanted into the asteroid belt as a consequence of
Anderson S. E., Vernazza P., Brož M.
doaj   +1 more source

Considering Contact Forces during the Formation of Planetesimals by Gravitational Collapse: Mutual Orbits, Spin States, and Shapes

The Astrophysical Journal
In this work, we apply a soft-sphere discrete element method (SSDEM) within the PKDGRAV N -body integrator to investigate the formation of planetesimal systems through the gravitational collapse of clouds of superparticles. Previously published numerical
Jackson T. Barnes, Stephen R. Schwartz, Seth A. Jacobson   +2 more
doaj   +1 more source

Gas Pressure Driven Screening Forces and Pebble Aggregation: A Pathway for Growth in Planet Formation

The Astrophysical Journal
The formation of planetesimals from centimeter-sized pebbles in protoplanetary disks faces significant barriers, including fragmentation and radial drift.
Mukesh Kumar Vyas
doaj   +1 more source