Results 1 to 10 of about 19,341 (163)

Theoretical models of planetary system formation [PDF]

Astronomy and Astrophysics, 2015
We extend the results of planetary formation synthesis by computing the long-term evolution of synthetic systems from the clearing of the gas disk into the dynamical evolution phase. We use the symplectic integrator SyMBA to numerically integrate the orbits of planets for 100 Ma, using populations from previous studies as initial conditions.We show ...
Willy Benz, Yann Alibert
exaly   +4 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

Searching For the t=0 of Planetary System Formation [PDF]

EPJ Web of Conferences, 2022
The composition of bodies in the solar system points to strong gradients in the volatile content within solid bodies hinting at the presence of gas-ice transitions across sublimation fronts in the young formative stages when the gas-rich disk was present.
Bergin Edwin, van’t Hoff Merel, Jørgensen Jes   +2 more
doaj   +1 more source

Origin and Formation of Planetary Systems [PDF]

Astrobiology, 2010
To estimate the occurrence of terrestrial exoplanets and maximize the chance of finding them, it is crucial to understand the formation of planetary systems in general and that of terrestrial planets in particular. We show that a reliable formation theory should not only explain the formation of the Solar System, with small terrestrial planets within a
Alibert, Y., Broeg, C., Benz, W., Wuchterl, G., Grasset, O., Sotin, C., Eiroa, Carlos, Henning, Thomas, Herbst, Tom, Kaltenegger, Lisa, Léger, Alain, Liseau, Réne, Lammer, Helmut, Beichman, Charles, Danchi, William, Fridlund, Malcolm, Lunine, Jonathan, Paresce, Francesco, Penny, Alan, Quirrenbach, Andreas, Röttgering, Huub, Selsis, Franck, Schneider, Jean, Stam, Daphne, Tinetti, Giovanna, White, Glenn J.   +25 more
openaire   +6 more sources

The formation of planetary systems with SPICA [PDF]

Publications of the Astronomical Society of Australia, 2021
Abstract In this era of spatially resolved observations of planet-forming disks with Atacama Large Millimeter Array (ALMA) and large ground-based telescopes such as the Very Large Telescope (VLT), Keck, and Subaru, we still lack statistically relevant information on the quantity and composition of the material that is building the planets, such as ...
Kamp, I., Honda, M., Nomura, H., Audard, M., Fedele, D., Waters, L. B. F. M., Aikawa, Y., Banzatti, A., Bowey, J. E., Bradford, M., Dominik, C., Furuya, K., Habart, E., Ishihara, D., Johnstone, D., Kennedy, G., Kim, M., Kral, Q., Lai, S. P., Larsson, B., McClure, M., Miotello, A., Momose, M., Nakagawa, T., Naylor, D., Nisini, B., Notsu, S., Onaka, T., Pantin, E., Podio, L., Marichalar, P. Riviere, Rocha, W. R. M., Roelfsema, P., Santos, F., Shimonishi, T., Tang, Y. W., Takami, M., Tazaki, R., Wolf, S., Wyatt, M., Ysard, N.   +40 more
openaire   +6 more sources

The formation of planetary systems [PDF]

Monthly Notices of the Royal Astronomical Society, 2004
In an embedded cluster, with high stellar densities, interactions can occur between stars and either newly formed diffuse protostars or high-density regions produced by the collision of turbulent elements. It is shown by smoothed particle hydrodynamics (SPH) modelling that interactions can occur in which the complete protostar, or high-density region ...
S. Oxley, M. M. Woolfson
openaire   +1 more source

Planetary formation in the Gamma-Cephei system [PDF]

Astronomy & Astrophysics, 2004
We numerically investigate under which conditions the planet detected at 2.1 AU of Gamma-Cephei could form through the core-accretion scenario despite the perturbing presence of the highly eccentric companion star. We first show that the initial stage of runaway accretion of kilometer-sized planetesimals is possible within 2.5 AU from the central star ...
Thébault, Philippe, Marzari, Francesco, Scholl, Hans, Turrini, Diego, Barbieri, Mauro   +4 more
openaire   +4 more sources

On the formation age of the first planetary system [PDF]

Proceedings of the International Astronomical Union, 2007
AbstractRecently, it has been observed the extreme metal-poor stars in the Galactic halo, which must be formed just after Pop III objects. On the other hand, the first gas clouds of mass ∼ 106 M⊙ are supposed to be formed at z ∼ 10, 20, and 30 for the 1σ, 2σ and 3σ, where the density perturbations are assumed of the standard ΛCDM cosmology.
Hara, Tetsuya, Kunitomo, Shuhei, Shigeyasu, Masanobu, Kajiura, Daigo   +3 more
openaire   +2 more sources

Architectures of planetary systems and implications for their formation [PDF]

Proceedings of the National Academy of Sciences, 2014
Significance Prior to the discovery of exoplanets, astronomers fine tuned theories of planet formation to explain detailed properties of the solar system. The discovery of exoplanets has significantly increased our appreciation for the diversity of planetary systems in nature. In this article we review the current understanding of the
openaire   +3 more sources

The McDonald Accelerating Stars Survey: Architecture of the Ancient Five-planet Host System Kepler-444

The Astronomical Journal, 2023
We present the latest and most precise characterization of the architecture for the ancient (≈11 Gyr) Kepler-444 system, which is composed of a K0 primary star (Kepler-444 A) hosting five transiting planets and a tight M-type spectroscopic binary (Kepler-
Zhoujian Zhang, Brendan P. Bowler, Trent J. Dupuy, Timothy D. Brandt, G. Mirek Brandt, William D. Cochran, Michael Endl, Phillip J. MacQueen, Kaitlin M. Kratter, Howard T. Isaacson, Kyle Franson, Adam L. Kraus, Caroline V. Morley, Yifan Zhou   +13 more
doaj   +1 more source