Results 31 to 40 of about 2,944 (214)

Planetesimals in Debris Disks [PDF]

, 2017
Planetesimals form in gas-rich protoplanetary disks around young stars. However, protoplanetary disks fade in about 10 Myr. The planetesimals (and also many of the planets) left behind are too dim to study directly. Fortunately, collisions between planetesimals produce dusty debris disks.
George H. Rieke, Andrew N. Youdin
openaire   +3 more sources

Erosion and the limits to planetesimal growth [PDF]

Astronomy & Astrophysics, 2015
16 pages, 14 figures, accepted for publication in A& ...
Chris W. Ormel, Chris W. Ormel, Carsten Dominik, Alexander G. G. M. Tielens, Sebastiaan Krijt   +4 more
openaire   +5 more sources

Are Pebble Pile Planetesimals Doomed? [PDF]

Monthly Notices of the Royal Astronomical Society, 2019
In parabolic flight experiments we studied the wind induced erosion of granular beds composed of spherical glass beads at low gravity and low ambient pressure. Varying g-levels were set by centrifugal forces. Expanding existing parameter sets to a pressure range between $p=300-1200\,$Pa and to g-levels of $g=1.1-2.2\,\rm m\,s^{-2}$ erosion thresholds ...
Tunahan Demirci, Maximilian Kruss, Jens Teiser, Tabea Bogdan, Felix Jungmann, Niclas Schneider, Gerhard Wurm   +6 more
openaire   +4 more sources

Planetesimal and gas dynamics in binaries [PDF]

Monthly Notices of the Royal Astronomical Society, 2008
18 pages, 13 figures, accepted for publication in ...
Paardekooper, Sijme-Jan, Thébault, Philippe, Mellema, Garrelt   +2 more
openaire   +7 more sources

PLANETESIMAL COMPOSITIONS IN EXOPLANET SYSTEMS [PDF]

The Astrophysical Journal, 2012
We have used recent surveys of the composition of exoplanet host stars to investigate the expected composition of condensed material in planetesimals formed beyond the snow line in the circumstellar nebulae of these systems. Of the major solid forming elements, we find that, as for the Sun, the C and O abundances (and particularly the C/O abundance ...
Olivier Mousis, Olivier Mousis, Nikku Madhusudhan, Jonathan I. Lunine, Torrence V. Johnson   +4 more
openaire   +4 more sources

ELemental abundances of Planets and brown dwarfs Imaged around Stars (ELPIS). I. Potential Metal Enrichment of the Exoplanet AF Lep b and a Novel Retrieval Approach for Cloudy Self-luminous Atmospheres

The Astronomical Journal, 2023
AF Lep A+b is a remarkable planetary system hosting a gas-giant planet that has the lowest dynamical mass among directly imaged exoplanets. We present an in-depth analysis of the atmospheric composition of the star and planet to probe the planet’s ...
Zhoujian Zhang, Paul Mollière, Keith Hawkins, Catherine Manea, Jonathan J. Fortney, Caroline V. Morley, Andrew Skemer, Mark S. Marley, Brendan P. Bowler, Aarynn L. Carter, Kyle Franson, Zachary G. Maas, Christopher Sneden   +12 more
doaj   +1 more source

Planetesimal Disk Evolution Driven by Planetesimal-Planetesimal Gravitational Scattering

The Astronomical Journal, 2003
29 pages, 1 figure, submitted to ...
openaire   +3 more sources

An Analytical Theory for the Growth from Planetesimals to Planets by Polydisperse Pebble Accretion

The Astrophysical Journal, 2023
Pebble accretion is recognized as a significant accelerator of planet formation. Yet only formulae for single-sized (monodisperse) distribution have been derived in the literature.
Wladimir Lyra, Anders Johansen, Manuel H. Cañas, Chao‐Chin Yang   +3 more
doaj   +1 more source

Microtextures and structures in metal–sulfide grains in NWA 869 meteorite and their relation to thermal history of L‐chondrite parent body

Meteoritics &Planetary Science, Volume 60, Issue 3, Page 616-631, March 2025.
Abstract Results of microanalysis study of NWA 869 meteorite, an ordinary chondrite, where silicates, Fe‐Ni alloys, and troilite are major constituents, are reported. The presented study of microtextures in metallic and sulfide grains provides information on processes occurring from the asteroid's accretion, through the impacts until cooling.
Paulina Skirak, Gabriela Opiła, Adam Piestrzyński, Gabriela Kozub‐Budzyń, Czesław Kapusta   +4 more
wiley   +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