Results 31 to 40 of about 24,968,366 (387)
Universe, 2021 The growing database of exoplanets has shown us the statistical characteristics of various exoplanet populations, providing insight towards their origins.
Jonathan H. Jiang +4 more
doaj +1 more source
Formation of planetary systems by pebble accretion and migration [PDF]
Astronomy & Astrophysics, 2018 At least 30% of main sequence stars host planets with sizes of between 1 and 4 Earth radii and orbital periods of less than 100 days. We use N-body simulations including a model for gas-assisted pebble accretion and disk–planet tidal interaction to study
B. Bitsch +6 more
semanticscholar +1 more source
Fly-by encounters between two planetary systems I: Solar system analogues [PDF]
Monthly notices of the Royal Astronomical Society, 2019 Stars formed in clusters can encounter other stars at close distances. In typical open clusters in the Solar neighbourhood containing hundreds or thousands of member stars, 10–20 per cent of Solar-mass member stars are expected to encounter another star ...
Daohai Li, A. Mustill, M. Davies
semanticscholar +1 more source
The ALMA survey to Resolve exoKuiper belt Substructures (ARKS)
Astronomy & AstrophysicsContext. CO gas has been detected in ~20 debris discs, typically classified as CO-poor or CO-rich. We present observations of the CO-rich HD 121617 debris disc as part of the ALMA survey to Resolve exoKuiper belt Substructures (ARKS). Aims.
Brennan A. +26 more
doaj +7 more sources
Planetary systems in a star cluster I: the Solar system scenario [PDF]
Monthly notices of the Royal Astronomical Society, 2019 Young stars are mostly found in dense stellar environments, and even our own Solar system may have formed in a star cluster. Here, we numerically explore the evolution of planetary systems similar to our own Solar system in star clusters.
F. F. Dotti +3 more
semanticscholar +1 more source
Properties of the Planetary Caustic Perturbation [PDF]
, 2010 Just two of 10 extrasolar planets found by microlensing have been detected by the planetary caustic despite the higher probability of planet detection relative to the central caustic which has been responsible for four extrasolar planet detections.
Albrow +23 more
core +1 more source
Sensitivity of elastic thickness to water in the Martian lithosphere
Progress in Earth and Planetary Science, 2019 Ancient Mars likely hosted oceans similar to those on Earth; however, such water is not presently observed on Mars. One possible explanation for the lack of present-day oceans is that surface water was transported into and stored within the interior of ...
Ikuo Katayama +2 more
doaj +1 more source
Survival of non-coplanar, closely packed planetary systems after a close encounter [PDF]
Monthly notices of the Royal Astronomical Society, 2018 Planetary systems with more than two bodies will experience orbital crossings at a time related to the initial orbital separations of the planets. After a crossing, the system enters a period of chaotic evolution ending in the reshaping of the system's ...
D. Rice, F. Rasio, J. Steffen
semanticscholar +1 more source
Cool DZ white dwarfs II: compositions and evolution of old remnant planetary systems [PDF]
, 2018 In a previous study, we analysed the spectra of 230 cool (Teff 1.9 dex, and Fe to Ni ratios similar to the bulk Earth, have accreted by far the most core-like exoplanetesimals discovered to date. With cooling ages in the range 1-8 Gyr, these white dwarfs
M. Hollands, B. Gaensicke, D. Koester
semanticscholar +1 more source
How Do Disks and Planetary Systems in High-mass Open Clusters Differ from Those around Field Stars? [PDF]
Astrophysical Journal, 2018 Only star clusters that are sufficiently compact and massive survive largely unharmed beyond 10 . However, their compactness means a high stellar density, which can lead to strong gravitational interactions between the stars.
K. Vincke, S. Pfalzner
semanticscholar +1 more source