Results 61 to 70 of about 22,321,491 (359)
Dating mylonitic overprinting of ancient rocks
Communications Earth & Environment, 2023 The timing of deformation in ancient shear zones of the Akia Terrane, Greenland, is recorded by the Proterozoic Rb-Sr age of mylonitic biotite which is determined through collision cell laser ablation and inverse thermal history modelling.
Christopher L. Kirkland +6 more
doaj +1 more source
Effects of unseen additional planetary perturbers on compact extrasolar planetary systems [PDF]
, 2017 Motivated by the large number of compact extrasolar planetary systems discovered by the Kepler Mission, this paper considers perturbations due to possible additional outer planets.
J. Becker, F. Adams
semanticscholar +1 more source
Dynamical Habitability of Planetary Systems [PDF]
Astrobiology, 2010 The problem of the stability of planetary systems, a question that concerns only multiplanetary systems that host at least two planets, is discussed. The problem of mean motion resonances is addressed prior to discussion of the dynamical structure of the more than 350 known planets.
Dvorak, Rudolf +24 more
openaire +5 more sources
Characterizing K2 Candidate Planetary Systems Orbiting Low-mass Stars. II. Planetary Systems Observed During Campaigns 1–7 [PDF]
, 2017 We recently used near-infrared spectroscopy to improve the characterization of 76 low-mass stars around which K2 had detected 79 candidate transiting planets. 29 of these worlds were new discoveries that had not previously been published.
C. Dressing +16 more
semanticscholar +1 more source
Exoplanets: Past, Present, and Future
Galaxies, 2018 Our understanding of extra-solar planet systems is highly driven by advances in observations in the past decade. Thanks to high precision spectrographs, we are able to reveal unseen companions to stars with the radial velocity method.
Chien-Hsiu Lee
doaj +1 more source
The signatures of the parental cluster on field planetary systems [PDF]
, 2017 Due to the high stellar densities in young clusters, planetary systems formed in these environments are likely to have experienced perturbations from encounters with other stars.
Maxwell X. Cai, S. Zwart, A. V. Elteren
semanticscholar +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
Huub Röttgering +26 more
openaire +5 more sources
Moving in the Dark: Enlightening the Spatial Population Ecology of European Cave Salamanders
Population Ecology, EarlyView.We assessed individual interactions, movement ecology and activity patterns of a subterranean population of Speleomantes strinatii, applying spatial capture–recapture modeling to a photographic dataset of 104 individuals. ABSTRACT Space use and movement are fundamental aspects of organisms' ecology, mirroring individual fitness, behavior, and life ...
Giacomo Rosa +2 more
wiley +1 more source
Widespread reworking of Hadean-to-Eoarchean continents during Earth’s thermal peak
Nature Communications, 2021 The nature and evolution of Earth’s crust during the Hadean and Eoarchean is largely unknown due to the lack of preserved material from this period. Here, the authors document a period of crustal rejuvenation between 3.2 and 3.0 Ga, coincident with peak ...
C. L. Kirkland +5 more
doaj +1 more source
Machines, 2023 Mesh phasing has a dramatic impact on the static and dynamic behaviours of planetary gear systems. This research investigates the coupled phase-tuning mechanism of two-stage planetary gear systems and the corresponding relationship with the coupled ...
Pengfei Yan +4 more
doaj +1 more source