Results 41 to 50 of about 85,153 (320)
On Wave Interference in Planet Migration: Dead Zone Torques Modified by Active Zone Forcing
The Astrophysical Journal, 2023 We investigate planetary migration in the dead zone of a protoplanetary disk where there is a set of spiral waves propagating inward due to the turbulence in the active zone and the Rossby wave instability, which occurs at the transition between the dead
Raúl O. Chametla +3 more
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Influence of grain size and composition on the contraction rates of planetary envelopes and on planetary migration [PDF]
Astronomy & Astrophysics, 2021 A crucial phase during planetary growth is the migration, when the planetary core has been assembled but has not yet opened a deep gap. During this phase, the planet is subject to fast type-I migration, which is mostly directed inwards, and the planet can lose a significant fraction of its semi-major axis.
Bertram Bitsch, Sofia Savvidou
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Antropologia Portuguesa, 2023 This article focuses on the critical importance of knowledge, a key trait of human culture, in multi-species environmental coadaptation and niche co-construction in human evolutionary history.
Shaozeng Zhang, Zhuo Chen
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Problem of planetary systems existence. II. Expected properties and the first results of the search
Вісник Астрономічної школи, 2004 Specialities of planets composition, their physical properties and classification are discussed. For planetary systems of different ages analysis of coming configurations is carried out. It is shown, that there are two principal vicinities on the diagram
V. A. Zakhozhay
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Application of recent results on the orbital migration of low mass planets: convergence zones [PDF]
, 2010 Previous models of the combined growth and migration of protoplanets needed large ad hoc reduction factors for the type I migration rate as found in the isothermal approximation.
Alibert, Y. +5 more
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Planetary migration in precessing discs for S-type wide binaries [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT The discovery of numerous circumprimary planets in the last few years has brought to the fore the question of planet formation in binary systems. The significant dynamical influence, during the protoplanetary disc phase, of a binary companion on a giant planet has previously been highlighted for wide binary stars. In particular,
Anne-Sophie Libert +2 more
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Good Combination of the Rossiter-McLaughlin Measurements and Direct Imaging Observations
EPJ Web of Conferences, 2011 We introduce a novel methodology to distinguish planetary migration mechanisms by a combination of Rossiter-McLaughlin measurements and direct imaging observations.
Narita N.
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The dynamical role of the circumplanetary disc in planetary migration [PDF]
Astronomy & Astrophysics, 2009 Numerical simulations of planets embedded in protoplanetary gaseous discs are a precious tool for studying the planetary migration ; however, some approximations have to be made. Most often, the selfgravity of the gas is neglected. In that case, it is not clear in the literature how the material inside the Roche lobe of the planet should be taken into ...
Frédéric Masset +4 more
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Migrating microbes and planetary protection
Trends in Microbiology, 2009 Since the dawn of the space age, humans have wrestled with concerns about planetary cross-contamination. Spacecraft launched from Earth can transport hitchhiker microbes to new worlds on both robotic and crewed vehicles. As plans proceed for future life detection and human exploration missions, planetary protection considerations are again uppermost on
Department of Microbiology +4 more
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Diversity and Origin of 2:1 Orbital Resonances in Extrasolar Planetary Systems [PDF]
, 2003 (Abridged) A diversity of 2:1 resonance configurations can be expected in extrasolar planetary systems, and their geometry can provide information about the origin of the resonances.
Lee, Man Hoi
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